gnushogi - GNU Shogi (Japanese Chess)
[ [[-]a] [-b bookfile] [-B binbookfile]
[-C] [-h langfile] [-L langfile] [-r length]
[-R] [-s pathname] [-l pathname] [-S binbooksize] [-t]
[-c size] [-T size] [-v] [-x] [-X] arg1
plays a game of japanese chess (shogi) against the user or it
plays against itself.
At startup Gnushogi
reads the binbook
file if it is present. It
then looks for a book
file. If it is present it adds its contents to
data. If the binbook
file is writable a new combined
file is written.
is a modified version of the gnuchess program. It has a simple
alphanumeric board display, or it can be compiled for use with the
program under X windows. The program gets its opening moves from
the file gnushogi.bbk
which is located in a directory specified in the
Makefile. To invoke the program type:
- gnushogi -C
- - simple curses based version
- gnushogi -X (or just gnushogi)
- - xshogi compatible version
- gnushogi -R
- - raw test display version
If one argument is given, it is the search time per move in [minutes:]seconds.
So gnushogi 30
will generate one move every 30 seconds, while
will generate one move every 5 minutes.
If two or more arguments are given, they will be used to set tournament time
controls with the first argument of each pair being the number of moves and
the second being the total clock time in minutes[:seconds]. Thus, entering
gnushogi 60 5
will set the clocks for 5 minutes (300 seconds) for the
first 60 moves, and gnushogi 30 3:30
will allow 3 minutes and 30
seconds for 30 moves.
gnushogi 30 5 1 :30
will allow 5 minutes for the first 30 moves and 30
seconds for each move after that. Up to 4 pairs of controls may be specified.
If no argument is given the program will prompt the user for level of play.
For use with xshogi
see the documentation on that program.
The book gnushogi.tbk
consists of a sequence of openings. An opening
begins with a line starting with a #
, the rest of the line is a
comment. Following this is a series of moves in algebraic notation alternating
black and white separated by white space. A move may have a ?
indicating this move should never be made in this position. Moves are stored
as position:move so transpositions between openings can take place.
The hashfile if created should be on the order of 4 megabytes or gnushogi -c
This file contains positions and moves learned from previous games. If
a hashfile is used the computer makes use of the experience it gained in past
games. Tests run so far show that it plays no worse with the hashfile than
without, but it is not clear yet whether it provides a real advantage.
Piece letters are determined by the language file. What is
specified here is the default (English).
is invoked, the program will display the board and prompt
the user for a move. To enter a move, use the notation 7g7f
first letter-number pair indicates the origin square and the second
letter-number pair indicates the destination square. An alternative is to use
the notation P7f
where the first letter indicates the piece type
(P,L,N,S,G,B,R,K). To promote append a + the type of the new piece to the
move, as in 2d2c+
Note that you must use capital
letters for the pieces by default.
- Do not search on opponent's time.
- Do search on opponent's time.
- -b bookfile
- Use bookfile for opening book.
- -B binbookfile
- Use binbookfile for binary opening book.
- -c size
- Create a new HASHFILE. File size is 2^size entries of
approximately 65+? bytes.
- Use curses-based display mode.
- Do not use hashfile.
- Do use hashfile.
- -l pathname
- Pathname of the loadfile use with get or
- -L lang
- Use language lang from the file
gnushogi.lang. If -L is not specified it uses the first language in
- -P plylevels
- Number of plys to include in the binbookfile. For
generating a binbookfile.
- -r length
- Rehash length times in searching entries for position in
- Use raw text display mode. This can be used for dumb
terminals or for systems that don't have curses.
- -s pathname
- Pathname of the save file to use with the save
- -S size
- Size of binbookfile for memory based books. For creating a
- Show statistics for HASHFILE
- -T size
- Set the transposition table size to 2^size entries.
- Show version and patchlevel.
- -x value
- Use value as the evaluation window
- Use xshogi display mode (the default).
In addition to legal moves, the following commands are available as responses.
command names are determined by the language
file and may
vary with the implementation. The default language is English.
-- allow algebraic input (not implemented)
-- change Alpha window (default score + 90)
-- change Beta window (default score - 90)
-- toggles beeping after each move (default: on).
-- updates the current board position on the display.
-- turns off use of the opening library.
-- causes the computer to play both sides of a shogi game.
-- causes the computer to take the white pieces, if the computer is
to move first.
-- saves a game to disk as a book textfile. The program will prompt
the user for a file name.
-- toggles game mode time control. Assumes the time specified for
time control is the time for a complete game. Input with the level command
should be the game time and the expected number of moves in a game. go
command must be given.
-- show coordinates on the display (visual only)
-- allows the value of contempt
to be modified.
-- asks for a piece as color piece, as wb or bn, and shows its
calculated value on each square.
-- sets level of debugging output if compiled with debug
-- allows the user to change the search depth of the program. The
maximum depth is 29 ply. Normally the depth is set to 29 and the computer
terminates its search based on elapsed time rather than depth. If depth is set
to (say) 4 ply, the program will search until all moves have been examined to
a depth of 4 ply (with extensions up to 11 additional ply for sequences of
checks and captures). If you set a maximum time per move and also use the
depth command, the search will stop at the specified time or the specified
depth, whichever comes first.
-- toggles easy mode (thinking on opponents time) on and off. The
default is easy mode ON. If easy mode is disabled, the keyboard is polled for
input every so often and when input is seen the search is terminated. It may
also be terminated with a sigint.
-- allows the user to set up a board position.
- command will clear the board.
- toggle piece color.
- command will exit setup mode.
- place a pawn on 3b
- place a promoted pawn on 3b
- place a pawn to the captured pieces
Pieces are entered by typing a letter (p,l,n,s,g,b,r,k) for the piece followed
by the coordinate.
The usual warning about the language file
-- exits gnushogi.
-- tells the computer to move first. Computer begins searching for
a move. (same as "go").
-- allows the user to enter moves for both sides. To get the
program to play after a sequence of moves has been entered use the 'black' or
-- retrieves a game from disk. The program will prompt the user for a
-- use/don't use hashfile.
-- allows the user to change the minimum depth for using the
hashfile and the number of moves from the beginning of the game to use it.
-- displays a short description of the commands and the current
status of options.
-- tells the computer to move first. Computer begins searching for a
move. (same as "first").
-- causes the program to supply the user with its predicted move.
-- allows the user to set time controls such as 60 moves in 5
minutes etc. In tournament mode, the program will vary the time it takes for
each move depending on the situation. If easy mode is disabled (using the
'easy' command), the program will often respond with its move immediately,
saving time on its clock for use later on.
-- writes the game moves and some statistics on search depth, nodes,
and time to the file 'shogi.lst'.
-- toggle material flag - draws on no pawns and both sides <
-- starts a new game.
-- evaluates the board and shows the point score for each piece. The
total score for a position is the sum of these individual piece scores.
-- causes the program to display the principal variation and the
score during the search. A score of 100 is equivalent to a 1 pawn advantage
for the computer.
-- exits the game.
-- causes the program to randomize its move selection slightly.
-- set recapture mode.
-- backout the last level for both sides. Equal to 2
-- causes the board display to be reversed. That is, the black
pieces will now appear at the top of the board.
-- reverse board display.
-- saves a game to disk. The program will prompt the user for a file
-- causes the program to switch places with the opponent and begin
-- performs some speed tests for MoveList and CaptureList
generation, and ScorePosition position scoring for the current board.
-- set computer's time remaining, intended for synchronizing clocks
among multiple players.
-- toggle tsume mode. In tsume mode, not all possible moves will be
generated. If a king is in check, only moves that get the king out of check
are generated. If the king is not in check, only moves that give check to the
opponent's king are generated.
-- undoes the last move whether it was the computer's or the
human's. You may also type "remove". This is equivalent to two
"undo"'s (e.g. retract one move for each side).
-- causes the computer to take the black pieces, if the computer is
to move first the go
command must be given.
-- read an xshogi
-- save as an xshogi
-- change X window. The window around alpha/beta used to determine
whether the position should be scored or just estimated.