Psi Chess (c) 1986 The Edge Software
------------------------------------

CONTENTS
                               Page
INTRODUCTION                    1
Loading PsiCHESS                1

QUICK START GUIDE               1
Controls (keyboard/joystick)    3

PsiCHESS IN DETAIL              3
Screen Colours                  4
Sound                           4
Display Modes                   4

GAME SETUP                      5
Choosing the Players            5
Setting the Clocks              5
Levels of Play                  6
Blitz/Balance/Beginner          7
The Move List                   8
Stepping forwards/backwards     8
Rotating the Board              9
Saving/Loading Game Position    9

POSITION SETUP                  10
Algebraic Setup                 10
Icon/Cursor Setup               11
PLAYING A GAME OF CHESS         12
Methods of Play                 13
Promotion/Underpromotion        13
Solving Mate                    13
A Summary of Commands           14
A Brief History of Chess
     and of Chess pieces        15

---------------------------------------------------------------------------------

INTRODUCTION

PsiCHESS is the most complete chess program available on any home microcomputer.
It not only features superb 3-dimensional graphic representation of a chess board
and pieces, but also has a standard of play rivalled by very few alternative
programs,

PsiCHESS has a full understanding of all the rules of chess, including the fifty
move rule, underpromotions (and any number of them), draw by repetition, and draw
by insufficient mating material.

PsiCHESS has been carefully created by a programmer who himself is a very able
chess player, and with a keen eye to satisfying beginner, improver and club
players alike.

LOADING PsiCHESS
PsiCHESS is designed to load into a 48K Spectrum/Spectrum +, or into a Spectrum
128 in 48K mode. To load PsiCHESS you simply enter:

LOAD "" and then press <ENTER>

You will see a unique 'counter' displayed during loading, and you will easily be
able to see when loading is complete when the counter reaches zero. PsiCHESS will
then automatically start.

QUICK START GUIDE

When PsiCHESS is first loaded it starts in the 3D display mode, with the Staunton
(wooden) chess pieces and it assumes that you wish to play as WHITE against the
computer as BLACK. It also starts with the computer playing at virtually its
least able 'instant response' level of A1 (see later for more information about
the levels of play in PsiCHESS.

Let's first quickly get an overview of PsiCHESS. You will note that the word
CHANGE is visible in the report section at the bottom of the screen. Whilst in
this mode you can switch between displays, alter basic set-up factors, and switch
between the various modes of 'Scoresheet', 'Position' and 'Game'.

Looking now at the various display options: press the 'S' key with '1' and you
will enter the scoresheet mode in which PsiCHESS not only displays the moves of
the game in algebraic form, but it also indicated the basic parameters which you
have set up. For instance at the top of the screen you will see who is playing
white, who is black, and that you are playing at level 'A1'. We'll discuss this
more fully soon.

Now hold down 'S' with '2' and you will see the 2-dimensional board
representation. This mode also features an 'ICONIC' board set-up, but we'll
return to that later too.

---------------------------------------(1)---------------------------------------

And now press 'S' with '4' and you will see the board set up with the superb
'Isle of Lewis' Medieval pieces on it. Pressing S and '3' will take you back into 
the initial 3D board with the Stauton, wooden pieces.

Finally, let's rotate the board: this is done by pressing the 'O' key with one of
the keys '1' to '4'. Using this you can rotate the board to see it from all 4
sides - but note, this does not effect who is playing with which pieces.

Playing...
Nows let's quickly look at playing a game of chess, before going on to to look in
greater detail at all of PsiCHESS's many and varied features:

To be able to start a game immediately all you have to do is press the 'M' and
'1' keys together. You will see that a 'G' has appeared to the right of the
central display at the bottom of the screen indicating that PsiCHESS is awaiting
your first move in a Game.

You will also see that your clock (lower left) has started to tick away in
seconds, and you can also see black's clock (the computers) on the lower right.

Entering moves is very simple and can be done in two different ways. PsiCHESS
allows you to enter the fairly traditional algebraic method of registering a
move, or it will allow you to use an on-screen cursor to select the piece you
wish to move and indicate which square you wish to piece to move to.

To use the algebraic method you simply type in your move as a four character
letter-number-letter-number combination. The first letter and number indicate the
square on which the piece you wish to move is sitting, the second pair refer to
the square you wish it to move to.

Quite simply, the squares are referred to by a letter A to H where the left-most
column of squares is the 'A' column, the next the 'B' column and so on. The
squares in a column are then numbered 1 to 8 bottom to top of your TV screen
(with white at the bottom - the numbering is reverse when white is playing down
the board).

Thus to make a common initial move of 'pawn to King four' you would enter E2-E4.
If you are playing the black equivalent of this move then it will be E7-E5 (this
would be true even if black were playing up the board - but I'll say more about
swapping sides and rotating the board later).

In the alternative 'CURSOR' mode of play you can play PsiCHESS in a much more
obvious manner - actually choosing pieces and moving them much as you would on a
physical chess board. Once you get used to this method of play you may well find
that it is the easiest by far. To get into this mode you simply press the 'J' key
with either the '1', '2' or '3' keys. J1 assumes that you wish to use the
left-hand Sinclair joystick, J2 assumes use of the eight-hand joystick, and J3 is
for use with a Kempston joystick.

---------------------------------------(2)---------------------------------------

However, you do not necessarily have to have a joystick attached to make full use
of this mode. Selecting either J1 or J2 will allow you to also use the keys 1-5
or keys 6-0 to move pieces:

J1
      1-left
      2-right
      3-down
      4-up
      5-select
J2
      6-left
      7-right
      8-down
      9-up
      0-select

Obviously, when you are using a joystick you simply move left, right, up and
down as usual, and then select using the fire button.

The operation in this CURSOR mode could hardly be more simple. Once in this mode
an arrow cursor will appear which you will need to position over the lower part
of the piece you wish to move. The you press the 'select' key or the fire
button. Now move the cursor to the square you wish the piece to move to and
press 'select' again. The piece will now move, unless of course your attempted
move was illegal, in which case PsiCHESS will tell you this with a message at
the bottom of the screen.

If you want to get back to normal keyboard control at any time then simply press
the 'K' key.

Having finished a game, if you want to simply start again then you first press
'I' to get the word CHANGE at the bottom of the screen, then press P and '1'
together and the board will be set up again. You can then re-start a game by
simply 'I' for CHANGE again, and then M and '1' as you did before.

PsiCHESS IN DETAIL

PsiCHESS has an enormous range of features, but the beauty of its design is that
you will probably not need to concern yourself with many of them in order to
learn chess, improve your, and to set out on a voyage of discovery which could
last a lifetime.

As you have seen from the initial 'Quick Start' section above, PsiCHESS is very
easy to play and with the possible exception of (hopefully!) your needing to
increase the level of play as your play improves you will not generally need to
do any more than we have discussed above. That said, PsiCHESS does have a wealth
of features which are exciting to explore and which contribute towards its
reputation as the best chess program for any home microcomputer.

---------------------------------------(3)---------------------------------------

CHANGEING PsiCHESS PARAMETERS
When the word CHANGE is displayed in the report section of the screen you can
change virtually any of the set-up parameters in PsiCHESS which are not actually
involved in moving pieces in a game.

Quick Reference
A complete summary of all these features and parameters is listed in a section at
the end of this manual for quick reference.

Changing the Screen Colours
This is easily done by pressing 'X', 'C' and 'B' together with one of the keys
0-9 to be able to change the INK, PAPER and BORDER colours to any in the
Spectrum's normal palette. As in Sinclair BASIC, changing the INK is associated
with the 'X' key, changing PAPER is done by press 'C' and pressing 'B' enables
the BORDER colour to change. For instance, try pressing the 'X' and '6' keys to
change the INK to yellow. You'll see that the chess pieces and half the board's
squares are now yellow rather than white. Note though, that PsiCHESS allows
literally all possible combinations of colour - even black INK and black PAPER
which means the board is invisible.

You can also set the BRIGHTness of the colours. To do this you use the 'B' key
again, but this time when used in conjunction with key '8' you will switch bright
off, whereas B with 9 will switch BRIGHT on again. This is particularly useful
when you want to have a generally bright coloured background such as cyan, and
whih to make the PAPER non-BRIGHT to match the BORDER (which cannot be BRIGHT).

Sound
You can also get a variety of sounds which will be heard when a key is pressed,
or a move is made by either the Program or yourself. The 'Z' key is used for this
in conjunction with keys 1 to 8. Z+1 will cause a fairly quick sound to be
emitted, whereas at the other extreme Z+8 causes a louder 'click/beep' sound.

You will find having sound on will be invaluable when playing against the
computer at a higher level when moves can take several minutes each. The sound
will then indicate when it is your turn to move.

Display Modes
There are no less than 4 display modes, all of which are accessed by pressing
the 'S' key with one of the keys 1 to 4. As you have seen above, S1 (S pressed
with the '1' key) puts you in a SCORESHEET display where you can also see the
basic set-up information. S2 is the 2-dimensional board display mode, S3 is the
3D Staunton set display, whereas S4 is the Isle of Lewis 3D Display.

---------------------------------------(4)---------------------------------------

GAME SETUP

Scoresheet display and 'S' mode
Setting up the various possible features of PsiCHESS is probably best done from
with the SCORESHEET display mode. Enter this display mode by pressing S+1 when
CHANGE is displayed (remember, if CHANGE is not visible pressing 'I' will usually
get you into this mode). In the scoresheet mode you will see the names of the
players, the last 15 moves made in a game(blank if a game has not yet commenced),
the level of play currently selected (or the type of play, see later), and
finally the two clocks for the two players.

Choosing the Players - WHITE and BLACK
You can opt for any of the 4 logical options of player: USER as white against
PROGRAM as black; USER as black against PROGRAM as white; PROGRAM playing both
black and white; and finally two USERS (humans) playing both sides.

This selection is done by entering the 'S' (set-up) mode by pressing the 'M' and
'3' keys together. When in this mode you will see an inverted S near the centre
of the bottom of the screen. The word CHANGE needs to be NOT showing when you
wish to action something in this mode, so if it is there press 'I' to get into
the 'S' mode proper.

Once in the S mode you can 'toggle' who is white and who is black by holding down
the 'T' key with either '1' or '2'. T=1 switches who plays white, and T+2
switches the black player. T+3 will toggle who is to move next. On the screen
this literally changes whether the words 'to move' are beneath WHITE or BLACK.

Note though, whilst we've looked at altering who is playing which pieces in this 
SCORESHEET mode you can in fact make these changes in any of the other display
modes too - although there is only displayed confirmation of your choice in this
mode. This is true for setting up most other parameters too.

Setting/Re-setting the Clocks
The clocks start running from the moment you start to play your first game, and
will continue to run without re-setting themselves for game after game after
game. In this way you can see a total time that you have played, and perhaps work
out an average. However, if you wish to re-set the clocks to zero before playing
each game, or wish to set the clocks to a specific time, then you must do the
following:

1) To re-set to zero: This is done by pressing 'T' with '4'.
2) Setting other values: For white's clock this is done in the 'S' mode by using
   the 'W' key in conjunction with the keys 1 to 5 to decrease the clock setting
   digit-by-digit, and using W with 6 to 0 to increase the setting. For black's 
   clock you follow a similar procedure but using the R key with the keys 1 to 5,
   and the keys 0 to 6.

---------------------------------------(5)---------------------------------------

   Note that key 5 thus relates to decreasing the units of seconds; key 4 relates
   to decreasing the tens-of-seconds; key 3 allows decreasing of units of minutes
   and key 2 allows the decrease of tens-of-minutes. The hours are reduced in
   units only by using the 1 key. Keys 6 to 0 operate similarly for increasing of
   the clocks. Note that decreasing the hours below zero resets the clocks to 99.
   Note too that changing the seconds and minutes readings will naturally effect
   the minutes and hours reading respectively.

Uses for setting the clocks:
1) Note that you can effectively handicap your opponent (or yourself) by setting
   one of the clocks to a higher or lower value before starting the game.
2) When playing in the BLITZ mode (more about this later), you can set each of
   the clocks to the most usual setting of 5 minutes per player, but you can also
   handicap one of the players by setting one of the clocks differently to the
   other.

Levels of Play
Changing the level of play is also done from within the 'S' mode (entered with
M+3). Like the display of who is playing and who is next to move, the setting of
the level of play is also only visible in the SCORESHEET display mode. However,
you can change the level in any of the other display modes if you wish.

PsiCHESS has no less than 7 'average move' levels, 6 'correspondence' levels, and
a further 3 special levels, two of which have probably not been available before
on a home computer chess game.

In the 'S' (Set-up) mode you once again wish to have the 'S' showing, but not
with the word CHANGE present.

When PsiCHESS first starts it sets itself to play at the lowest 'average move'
level of 'A1'. This is selected by simply pressing the keys A and 1
simultaneously. To get A2, you press A and then 2 and so on for the other levels
A3 to A7.

Similarly you can select the 'correspondence' levels of C1 to C6 by using the C
key together with the relevant number key.

The difference in the levels of play primarily lies in the length of time
PsiCHESS takes for a move. This length of time of course reflecting its standard
of play, the degree to which it is 'looking ahead' in the game, and the degree of
sophistication of the PSICHESS 'artificial intelligence routines' that particular
level has access to.

At its very lowest level (Beginners), for instance, response is almost instant,
PsiCHESS is not using its knowledge of opening and cannot force a checkmate in
an endgame situation. At the other extreme of the highest correspondance level
moves can take a very long time, but PsiCHESS is using its maximum look-ahead and
all of its artificial intelligence routines to effect a game best suited for
correspondance (non-tournament) situations.

---------------------------------------(6)---------------------------------------

Here is a rough guideline to the response times of each level:

Level     Response time
A1        Instant               For occasional players
A2        3 secs                Intermediate player
A3        10 secs               Experienced player
A4        20 secs               Advanced player
A5        40 secs               Club standard
A6        1 min 30 secs         Congress play
A7        3 mins                Tournament play

C1        10 mins               Correspondence
C2/C6     (increasing times)    Also correspondence only

Note: The above response time are only estimated averages for each level.
PsiCHESS's response times can vary considerably according to the actual position
of pieces and state of play (as with human players). For this reason there may be
times when response is somewhat slower than indicated above.

Further levels/modes
These are called 'Beginners mode', 'Balance' and 'Blitz'. Each of them is
selected in a similar manner to the A and C levels by pressing the 'B' key with a
number key 1, 2, or 3.

B1 - Blitz
In this you set up a game in which all the moves must be played within a given
time limit. The typical time limit which is set is 5 minutes. Thus it would be
be usual when selecting this mode to set both of the clocks to 5 minutes before
commencing the game. This is probably best done by totally resetting the clocks
using T4 and then just increasing the minutes digit of each clock using W8 and R8.

In Blitz chess the main aim is for an entire game to played within the time
allotted, and the first player to gain mate, or whose opponent runs out of time
is declared the winner. However, note that PsiCHESS does not give a 'time up'
report when the time reaches zero. Once one of the clocks has reached zero it
will re-set again to 99 Hours. You can thus keep playing even after the game is
technically 'over', rather than being forced to stop.

If you play against the program in Blitz mode, then PsiCHESS will be varying its
response time in accord with the time it has left in which to move. PsiCHESS thus
shows effectively shows INFINITE move times in this mode, getting increasingly
quick as the time alloted ebbs away. When the time allowed is up and the clock
trips over to 99 hours PsiCHESS will continue to play in 'instant response' mode
as if it were just about to run out of time.

Thus, please note, if you select a time for play in Blitz involving tens of hours
then PsiChess will be handicapped and play as if it had virtually no time at all.
Speaking of handicapping, it is of course very to set up the Blitz mode so that
one player has less time to play in than the other.

---------------------------------------(7)---------------------------------------

B2 - Balance of levels mode
In this mode, sometimes called 'equality mode', PsiCHESS will vary its response
time to try to match your own. Thus if you take a long time over moves so will
it, and if you move quickly then so will PsiChess. In practice, however, you may
find that the program's clock will be out of synchrony with you by anything up to
a few minutes.

B3 - Beginners level mode
This is a unique special mode of play in which PsiCHESS deliberately plays a
slightly poor game, In this mode PsiCHESS is not referring to its book of
opening, is not able to force a mate in an endgame situation, and generally the
Beginners mode does not have access to the entirety of the complex artificial
intelligence routines which PsiCHESS uses in other levels of play. This mode is
thus ideal for absolute beginner who may otherwise find the strength of play of
microcomputer chess programs rather off-puttingly strong even on their so-called
lowest level.

The Move List
You can see the move list in the SCORESHEET mode (S1). PsiCHESS will hold the
most current 60 moves in a game and will display the most recent 15 moves at any
given moment in the SCORESHEET display. In order to look at the other 3 quarters
of the stored move list you can use the Q key with the keys 1 to 4:

Q1    The first 15 moves
Q2    The moves 16-30
Q3    Moves 31-15
Q4    Moves 46-60

There is also

Q5    Displays the quarter with the last moved played visible.

Stepping Forward & Back Through a Game's Moves:
PsiCHESS also allows you to scroll forward and backwards through the move list,
or do a kind of 'action replay' in either the 2D or 3D modes.

This is done by pressing the Z and X keys whilst in the 'S' (setup) mode.
Operationally, this usually means that you will have to get CHANGE showing by
pressing 'T' (or breaking into the game with BREAK), then select the 'S' mode
with M+3 and then use the Z, X keys to move forward and backward through the
move list. Obviously, in the SCORESHEET mode this means that you will be
scrolling through the algebraic listing, whereas in the 2D or either of the 3D
displays you actually see the game play with moving pieces,

---------------------------------------(8)---------------------------------------

This feature can be very useful if you wish to go back a move or two to replay
the game from that point - perhaps having made a foolish error, or because you
have changed you mind about a development of pieces. You might even wish to see
whether having lost to the program you could have won taking a different approach
during the endgame play.

Note that if you do anything in the set-up mode, or enter the 2D mode to set up a
new game using the ICONS (we'll discuss this later), then the scoresheet will be
re-set and  you will no longer be able to step forward and back through the
listing of the prior game.

Removing the Report/Clocks from View
Whilst concentrating on a move you are about to make, or whilst the program is
making its decision, you may wish not to be disturbed by the presence of the
report line with the clocks at the bottom of the screen. This line can be made
invisible by simply pressing keys L and 2. Pressing L and 1 will make the line
visible again.

Rotating the board in the 3D modes
In either of the 3D modes of display (S3 & S4) you can rotate the board and thus
see the game from a different angle of view by simply pressing the O
(Orientation) with one of the keys 1 to 4. O1 is the normal view with the white
pieces at 'your' lower end of the screen, going through a view from the right
side, to view from the black end of the board, to the view from the left hand
side of the board. Obviously, if you chose to play the black then you will almost
certainly wish to use O3 to put the black pieces at your end of the board,

Saving and Loading a Game
PsiCHESS allows you to save your current position onto tape or to load in a
previously saved position from tape. All pertinent factors relevant to the game
are also saved such as whether the King or Rooks have moved (important so that
upon re-loading PsiCHESS knows whether castling is legal or not) and so on.

To SAVE your game position simply ensure that you are in S (Setup) mode and also
ensure that your tape recorder is recording. When the tape is already playing
press the keys S and 8 and saving will commence immediately. Your game position is
saved in a special manner, and only files saved by PsiCHESS can subsequently be
re-loaded by it.

To LOAD a previously saved game position you simply follow the above procedure,
but in this case you press S9 and the program will be waiting for your tape
player to play the recorded file into the machine. Once loaded you will that
the board has been set up with all the pieces as they were when you saved the
game.

These features are obviously indispensible when you are having a good game which
you have to interrupt, or especially when you are having an extended
correspondance game with someone (or even with another computer...).

---------------------------------------(9)---------------------------------------

POSITION SETUP/CHANGE

The 'P' (Position) Mode
The following section deals with the use of the P (Position) mode which enter by
pressing the M and 2 keys whilst CHANGE is displayed in the reporting area, You
will note a P will appear by the report section at the bottom of the screen when
this mode is selected.

Basic Set-up/Re-set-up
Probably the most frequently used re-setting-up of the board will be to return
all the pieces to their usual positions on the board in order to re-start a game.
This is done simply by pressing the P and 1 keys whilst in this P mode. P1 also
causes the 'to move' indicator to reset to white,

However there are other set-up options which come into play when you wish to set
pieces up on the board in anything other than their usual original places. You
have two basic options on setting up pieces: in one case you can simply enter in
algebraic form the piece you wish to place on the board and where you wish to put
it; in the alternative method you can select ICONs of the pieces and effectively
move them to the place on a 2D board that you wish them to be in.

Algebraic set-up
First the algebraic method: In this case you will enter letters and numbers
whilst in the P mode, This is not totally dissimilar to making moves
algebraically whilst playing the game. You can either choose to put a SPACE on
the board at a point where there was previously a piece, or you can place any
piece anywhere on the board too. The following letters indicate which piece you
are referring to:

S     Put a space
W     White piece
B     Black piece
P     Pawn
N     Knight
B     Bishop
R     Rook
Q     Queen
K     King

The format is simple. For instance, if you wish to place the white King at the
position E7 on the board then you simply type in WK E7 - in fact what appears on
the screen is 'WK-E7', but the program puts the hyphen in for you).

Similarly, having put a piece on square D3 by mistake, you can remove it easily
by entering: S D3. In this case you will see it displayed in the report area as
_S-D3. That is, having typed 'S' it assumes you want to then only to specify a
square, and once again it inserts the hyphen.

--------------------------------------(10)---------------------------------------

You can do this setting up in the 2D or either of the 3D modes. However, should
you place one piece on top of another in the 3D mode without putting a space on
that square between the placing of the 2 pieces then what appears on screen will
be somewhat a mixture of the last piece you placed there and some stray 'junk
pixels'. In fact, though, if you simply use the Orientation feature to rotate the
board, or switch to 2D and back again then the 'mess' will disappear. Obviously,
the final piece placed on any square is the one PsiCHESS assumes you wish placed
there.

Cursor piece set-up
To set up the pieces using a cursor and ICON method you must also be in the 'P'
mode but also in the 2D mode entered with S+2 (Screen mode 2).

In this mode you only have to select any of joysticks (J with a number key) and
the ICONs will appear up either side of the 2D board display. Putting any given
piece on the board is then very easy. You simply move the arrow cursor to the
piece in question, press select (fire), move to the required square and then
press select (fire) again. As when playing using the cursor mode, you can also
play using the keyboard by selecting either J1 or J2 for the Sinclair joysticks
which operate of the numeric keys. To put a space where there is currently a
piece you simply select one of the two empty squares at the top of the columns of
icons and having selected it as if it were a piece simply place it on the square
in question to erase any piece already there.

If you wish to set up a game then you may wish to start with any empty board or
a board with the pieces in their normal starting positions, If you want to start
from a full, normally set-up board then you would press the P an 1 keys we saw
earlier. However, if you want to set-up and endgame situation with very few
pieces on the board, then you would be best advised to start with the set-up
offered by either pressing P+2 or P+3. In the former case PsiCHESS just puts the
Kings and Rooks on the board, in the later it just puts the Kings on.

Note that when you use P1 or P2 the Rooks and Kings are assumed not to have
moved. Similarly, when you use P3 the Kings are assumed not to have moved. If
one of them is to be considered to have moved when the game starts, then it
should be removed from the board and replaced again on its own square (if that is
to be its position). Obviously, this is a unique situation in which the program
will need to know when play starts whether a King which is on its own square may 
legally castle or not.

Some features of set-up...
There are a number of features that these set-up modes offer, For instance, you
interupt a game, and change the nature of it by adding or taking pieces away
before re-starting the game again.

The set-up procedures also do not dictate how many of any given piece you can put
on a board. Thus (although the program would display an 'illegal move' report
very quickly) there is no reason why you should not set up a board with more than
2 kings on it. It can also set up legal positions such as a board with many
Queens on it, which whilst feasible and legal in 'normal' chess play on a real
board, is not usually possible due to the physical lack of extra pieces in
typical chess sets.

--------------------------------------(11)---------------------------------------

PLAYING A GAME OF CHESS

Although virtually all that you need to know to play chess using PsiCHESS has
been covered in the above sections, we'll quickly summarise some of the major
features again here, and highlight some other features of play which we have not
covered above.

Essentially, there are two methods of play: algebraic move entry and cursor, or
joystick move entry. The former is the more traditional method used by most
computer chess games to date, and by many dedicated chess machines. In this the
board is seen as a matrix of squares where the columns are labelled A to H
horizontally from the left-hand side, and the actual squares within each column
are labelled from the white pieces' end of the board toward the black end 1
through to 8. Thus with the board orientated with the white pieces at 'your' end,
the bottom left hand corner is labelled A1 and the top right hand corner is H8.

Playing in the SCORESHHET mode
Note that you can even play when neither the 2D nor 3D boards are showing by
entering your moves in this algebraic fashion from within the SCORESHEET mode
(entered by pressing S+1).

The Cursor/Joystick Method of Play
As we previously saw, to get into this mode of play you simply press the J key
with either 1, 2 or 3 to select the Sinclair1, Sinclair2, or Kempston Joystick
controls as required respectively. We also noted that selecting either of the
Sinclair controls allows you to have the option of playing using keys instead of
a joystick - indeed you don't need one attached to play this way. In this case
you would use the key 1-5 or 6-0 depending on which Sinclair joystick was
selected.

Once selected the word CURSOR appears at the bottom of the screen to remind you
that you are in this mode. To get keyboard control back again you simply press K.
You would then need to press I if you wanted to go on to change the orientation,
change to S mode to back-step, change players, change who is to move, and so
forth.

When the program is 'thinking' you will note that the arrow cursor disappears
from the screen to ensure that its presence does not disturb your concentration.
Equally, when it is your turn to play you can 'hide' the cursor in the bottom
left hand corner of the screen in order to have a clear 'uncluttered' screen to
look at whilst trying to decide your move.

Finally, note that there is an arrow in the lower area of the screen, just to the
left of where the algebraics or the word CHANGE appear. This arrow shows the
direction of movement of the white pieces at any time. This arrow can be
invaluable if in a mature game you change the orientation and it is not
immediately evident which direction white is now moving in.

--------------------------------------(12)---------------------------------------

Rules of Chess
I shall not attempt to summarise the entire rules of chess here - there are many
good books on the subject that can do that job much better - but I shall
summarise some of the features PsiCHESS has to offer in regard to the rules of
chess.

First, PsiCHESS understands all of the rules of chess, including the 50 move
rule, underpromotions, and draws due to 3-fold repetition or due to insufficient
mating material.

Promotion/Underpromotion
PsiCHESS has a full understanding of underpromotion and promotion. It will not
automatically promote a pawn to a Queen.

When it is playing it has no limit to what it will underpromote its pawns to. It
could theoretically (if it felt it strategically necessary) underpromote all 8
of its pawns to knights (where it physically possible to get them all to the end
of the board).

When you play and get a pawn to a promotion position you will be faced with the
following display at the bottom of the screen:

Q R B N ?

Your are being invited to press one of the four keys to promote your pawn to
either a Queen, Rook, Bishop, or Knight respectively. As when it is playing, it
too does not assume that you wish to promote to a Queen.

Obviously, whilst this is all legal within the rules of chess, it is far from
usual to be able to play a game on a usual physical board in which you can
promote two pawns both to be Queens, for instance. This is one clear advantage
for the computer chess program.

Solving Mate
PsiCHESS does not have a 'solve mate' mode as such. However, levels A4nand C1
have been designed so that the former will solve any mate in 2, whereas the
latter will solve any mate in 3. Obviously, you would set the program to play
itself using the T1 and T2 options in the 'S' mode (T for Toggle).

Loading other 3D Chess pieces
This is a future development planned at the time of writing this manual. Write to
The Edge for details. Further 3D characters are planned which will be sold
separately from PsiCHESS itself. These alternative 3D sets will replace the Lewis
ones in memory and you will be able to load them by pressing the S key and the 0
key.

Warning! If you press these keys in error, or indeed if you press the S9 keys in
error and PsiCHESS starts trying to load a saved game, then you will NOT be able
to break out. In the case of pressing S0 by mistake you will probably have to
power-off and re-load the game. In the case of mistakenly pressing S9 you would
be able to avoid reloading the game only if you have a previously saved game
position you can load in.

--------------------------------------(13)---------------------------------------

A Summary of Commands and Features

'CHANGE' functions (that is, when CHANGE is showing):

B0 .. B7    Border Colours
C0 .. C7    PAPER Colours
X0 .. X7    INK Colours
L1 .. L2    Make report line visible/invisible
Q1 .. Q4    Change board orientation
Q1 .. Q4    Select quarter of scoresheet being viewed
Q5          Quarter showing last move
S1 ,, S4    Screen display selection:
            S1    SCORESHEET
            S2    2D
            S3    3D Staunton Pieces
            S4    3D Isle of Lewis Pieces
Z1 .. Z8    Sound (volume/length of note)
I           This toggles whether CHANGE is showing.
M1 .. M3    The three major modes:
            M1    Game mode (G)
            M2    Position mode (P)
            M3    Setup mode (S)

Mode 3 (Setup) functions:

A1 .. A7    Average move levels
B1          Blitz
B2          Balance
B3          Beginners
C1 .. C6    Correspondence levels (use with caution!)
S0          Load new graphics for 3D pieces (future enhancement)
S8          Save game position
S9          Load previously saved game position
R0 .. R9    Black clock amendment (1..5 dec, 6..0 inc)
W0 .. W9    White clock amendment (1..5 dec, 6..0 inc)  
T1          Toggle player of white pieces
T2          Toggle player of black pieces
T3          Toggle which player to move next
T4          Resets both of the clocks to zero
Z           Step forward through move list
X           Step backward through move list

--------------------------------------(14)---------------------------------------

A Brief History of Chess and Chess Pieces

The game
Chess is undoubtably one of the oldest games known to modern man. Since Caxton
printed his book 'The Game and Playe of Chesse' in 1474, the history of the game
of chess has fascinated both players and historians alike. In its very earliest
form chess was game played by 4 people each of whom had 8 pieces under their
control - a King, a Rook, a Knight, a Bishop and 4 pawns. The opponents began
each in one corner of the board - which was made up of 64 squares much as today.
This game was being played as long ago as 2500 BC, in the form of the Hindu game
called chaturanga.

The next step in the evolution of the game came in Mediaval times around the 6th
century AD. By this time chess was played by two people, each controlling the
more usual count of 16 pieces. During this period the game developed to be very
much as it is in its current form - with virtually the same pieces laid out on
the board in the same intitial places as today.

It wasn't until the 16th century that any further change came to the game of
chess. Prior to this point the main piece (a Counsellor) was not able to move as
freely, and was now given the combined permitted moves of a Bishop and a Rook, as
is the case with the modern 'Queen'. And the power of the Bishop was extended to
command an entire diagonal instead of moving just one or two squares. The pawns
were also now allowed to move one or two squares for their initial move, which
had not been previously been permitted.

Chess pieces
Chess has inspired craftsmen throughout the ages to carve magnificant pieces for
the game in its various forms. But without doubt some of the most beautiful chess
pieces were made in Europe at a very early date.

The Lewis chess pieces are probably the most famous of these older pieces and are
to be found in the British Museum and in the Museum of Antiquities in Edinburgh.
These are the earliest authentic European pieces and were discovered on the
Scottish Isle of Lewis in 1831. Their exact origin is unknown, but they were
almost certainly made in either Scotland itself or in Scandinavia (the artforms
of both regions were very similar at that time). The pieces are made of carved
ivory, and date from around the 11th or 12th century.

However, throughout the history of chess there was a single fact that plagued the
game in its early form: players often mistook one piece for another, It was then
a revolutionary step when, in 1835, Nathaniel Cook designed the Staunton set of
pieces with a particular view to radically reducing confusion between the pieces
during play.

He designed this now standard set of chess pieces at a time when players were
actually refusing to play each other because they would each claim not to be able
to recognise the pieces in the other's set!

--------------------------------------(15)---------------------------------------

Cook, the designer, was a friend of the master chess player Howard Stauton (hence
the name of the set). Manufacture began in London in Leather Lane EC1, by Mr
Jaques who obtained the copyright license for the design. Many thousands of
Staunton pieces have been made in many materials such as fine woods and ivory,
and it is a tribute to Cook that the design still reigns supreme for clarity of
play.

PsiCHESS's Chessmen Graphics
As you will see, in PsiCHESS there are two quite separate 3-dimensional chess
sets: one closely modelled on the Isle of Lewis pieces dating back to Medieval
times, and the other is a very faithful representation of shinny wooden Staunton
chess set. Note that the Lewis set is graphically very impressive, and that you
can see both front and back views of the pieces. But note also that the Staunton
set is decidedly easier to play with, even if the pieces are perhaps a little
less fun to play with than the Lewis!

                        ---------------------------------

Disclaimer

Whilst every effort has been made to ensure that PsiCHESS is completely free of
any errors, The Edge points out that it cannot guarantee that a program of the
very great complexity of PsiCHESS is actually free of any errors. Should you
discover any problem with the program though, The Edge would be very keen to
hear from you at the following address:

The Edge
36/38 Southampton Street
Covent Garden
London WC2E 7HE
England.

This manual is Copyright (c) 1986 Steven L. Watson & The Edge. All rights
reserved by the publisher. This manual may not be lent, hired or copied by any
means whether mechanical or electronic without the prior written permission of
The Edge.

--------------------------------------(16)---------------------------------------
