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Man Page for GNUCHESS



NAME

       gnuchess - Chess


SYNOPSIS

       gnuchess [ [[-|+]a] [-A aging-rate] [-b bookfile] [-B bin-
       bookfile] [-C cache-table-size] [-c] [[-|+]D ]  [[-|+]E  ]
       [[-|+]e  ]  [[-|+]F  ]  [-H hash-depth] [[-|+]h ] [-L lan-
       guage] [-l listfile] [[-|+]N]  [[-|+]p  ]  [-P  plys]  [-r
       length]  [-s savefile] [-S binbooksize] [-t] [-c hashfile-
       size] [-T transition-table-size] [[-|+]V]  [-v]  [-x]  [-z
       search-fuzz] arg1 arg2 ]


DESCRIPTION

       Gnuchess  plays  a  game  of  chess against the user or it
       plays against itself.

       Gnuchess is an updated version of the  GNU  chess  playing
       program.   It has a simple alpha-numeric board display, an
       IBM PC compatible interface, or it can be compiled for use
       with  the  chesstool  program on a SUN workstation or with
       the xboard program under X-windows.  To invoke the program
       type:

       gnuchess
              - simple curses based version

       gnuchessn
              -  fancy  version using curses and inverse video on
              UNIX, or IBM PC cursor controls and  characters  on
              MSDOS

       gnuchessr
              - ASCII based version

       gnuchessc
              - chesstool compatible version

       gnuchessx
              - xboard compatible version


TIME CONTROLS

       If  one  argument is given, it is the search time per move
       in [minutes:]seconds.  So gnuchess 30  will  generate  one
       move  every  30 seconds, while gnuchess 5:00 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
       gnuchess 60 5 will set the clocks for 5 minutes (300  sec-
       onds)  for  the  first 60 moves, and gnuchess 30 3:30 will
       allow 3 minutes and 30 seconds for 30 moves.

       gnuchess 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 chesstool or xboard, see the documentation on
       those programs.


BOOK

       At startup Gnuchess reads the binbook file if it  is  pre-
       sent.  It  then looks for a book file. If it is present it
       adds its contents to the binbook data. If the binbook file
       is writable a new combined binbook file is written.

       The book gnuchess.book consists of a sequence of openings.
       An opening begins with a line starting with  a  !   ,  the
       rest  of the line is comments.  Following this is a series
       of moves in algebraic notation alternating white and black
       separated  by  white  space. A move may have a ?  after it
       indicating this move should never be made  in  this  posi-
       tion.  Moves are stored as position:move so transpositions
       between openings can take place.


HASHFILE

       The hashfile if created  should  be  on  the  order  of  4
       megabytes or gnuchess -c 22.  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.


LEGAL MOVES

       Note: Piece letters and legal castling notation is  deter-
       mined by the language file.  What is specified here is the
       default English.

       Once gnuchess is invoked, the  program  will  display  the
       board and prompt the user for a move. To enter a move, use
       the notation e2e4 where the first letter-number pair indi-
       cates  the origination square and the second letter-number
       pair indicates the destination square.  An alternative  is
       to  use  the notation nf3 where the first letter indicates
       the piece type (p,n,b,r,q,k).  To castle, type the  origin
       and  destination  squares of the king just as you would do
       for a regular move,  or  type  o-o  or  0-0  for  kingside
       castling  and  o-o-o or 0-0-0 for queenside.  To promote a
       pawn append the type of the new piece to the move,  as  in
       e7e8q or c7c8r.


FUNCTION LETTERS


       -L lang
              Use  language lang from the file gnuchess.lang.  If
              -L is not specified it  defaults  to  the  language
              used  in  the first line in the file.  gnuchessr -L
              ger will use the german language.

       -A aging-rate
              Specify aging rate for hash table entries

       [-]a   Do [do not] search on opponents time.

       -b bookfile
              Use bookfile for opening book.

       -B binbookfile
              Use binbookfile for binary opening book.

       -C cache-size
              Specify evaluation cache table size (in entries).

       -D     Toggle DEEPNULL at runtime.

       -E     Toggle flag.threat.

       -e     Toggle flag.neweval to force evaluations instead of
              estimates

       -F     Toggle flag.noscore

       -H hash-depth
              pecify depth in plys for hashing.

       -S size
              Size of binbookfile for memory based and GDX books.
              For creating a binbookfile.

       -P plylevels
              Number of plys to include in the  binbookfile.  For
              generating a binbookfile.

       -p     Toggle flag.pvs

       -c size
              Create  a new HASHFILE. File size is 2^size entries
              of approximately 65 bytes.

       [-]h   Do [do not] use hashfile.

       -l pathname
              Pathname of the loadfile use with the get or  xget.

       -r length
              Rehash length times in searching  entries for posi-
              tion in transposition table.

       -s pathname
              Pathname of the save file to use with the save com-
              mand.

       -t     Show statistics for HASHFILE

       -T size
              Set  the  transposition table size to size entries.
              (minimum is MINTTABLE)

       -v     Show version and patchlevel.

       -x value
              Use value as the evaluation window xwndw.


COMMANDS

       In addition to legal moves,  the  following  commands  are
       available  as  responses.   Note: command names are deter-
       mined by the language file and may vary with the implemen-
       tation. This is default English.

       alg -- allow algebraic input (not implemented)

       Awindow -- change Alpha window (default score + 90)

       Bwindow -- change Beta window (default score - 90)

       beep -- causes the program to beep after each move.

       bd -- updates the current board position on the display.

       bk  -- Print out all moves for this position from the book
       as: move response value

       book -- turns off use of the opening library.

       both -- causes the computer to play both sides of a  chess
       game.

       black -- causes the computer to take the black pieces.  If
       the computer is to move  first  the  go  command  must  be
       given.

       eco -- Print out opening information for this game - lists
       ECO # and variations

       coords -- show coordinates on the display (visual only)

       contempt -- allows the value of contempt to be modified.

       debug --  asks for a piece as color piece, as  wb  or  bn,
       and shows its calculated value on each square.

       debuglevel  --  sets level of debugging output if compiled
       with debug options.

       depth -- 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.

       easy  -- 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.

       edit -- allows the user to set up a board position.

            # - command will clear the board.

            c - toggle piece color.

            .  - command will exit setup mode.

       pb3 - place a pawn on b3

       Pieces  are  entered  by typing a letter (p,n,b,r,q,k) for
       the piece followed by the coordinate.

       The usual warning about the language file applies.

       exit -- exits gnuchess.

       first -- tells the computer to move first. Computer begins
       searching for a move.  (same as "go").

       force -- 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  'white'  or 'black' command followed by
       'go'.

       gamein -- 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.

       get  --  retrieves  a  game  from  disk.  The program will
       prompt the user for a file name.

       go -- tells the computer to move  first.  Computer  begins
       searching for a move.  (same as "first").
       hash -- use/don't use hashfile.

       hard -- think on opponents time

       hashdepth  --  allows the user to change the minimum depth
       for using the hashfile and the number of  moves  from  the
       begining of the game to use it.

       help  --  displays a short description of the commands and
       the current status of options.

       hint -- causes the program to supply  the  user  with  its
       predicted move.

       level  --  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.

       list -- writes the  game  moves  and  some  statistics  on
       search depth, nodes, and time to the file 'chess.lst'.

       material  --  toggle material flag - draws on no pawns and
       both sides < rook

       Mwpawn, Mbpawn, Mwknight, Mbknight, Mwbishop, Mbbishop  --
       print out static position evaluation table

       new -- starts a new game.

       p  --  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.

       post -- causes the program to display the principle varia-
       tion and the score during the search.  A score of  100  is
       equivalent to a 1 pawn advantage for the computer.

       unpost -- turn off the post display.

       quit -- exits the game.

       random  -- causes the program to randomize its move selec-
       tion slightly.

       rcptr -- set recapture mode.

       remove -- backout the last level for both sides. Equal  to
       2 undo's.

       reverse  -- causes the board display to be reversed.  That
       is, the white pieces will now appear at  the  top  of  the
       board.

       rv -- reverse board display.

       setup -- Compatibility with Unix chess and the nchesstool.
       Set up a board position.  Eight lines of eight  characters
       are  used  to  setup  the  board. a8-h8 is the first line.
       Black pieces are  represented  by  uppercase characters.

       stars -- (gnuchessn only) add stars (*) to black pieces.

       save -- saves a game to disk.  The program will prompt the
       user for a file name.

       switch  --  causes  the  program to switch places with the
       opponent and begin searching.

       test -- performs some speed tests for  MoveList  and  Cap-
       tureList  generation,  and  ScorePosition position scoring
       for the current board.

       time otim -- time set computers time  remaining,  intended
       for  synchronizing clocks among multiple players.  -- otim
       set opponents time remaining, intended  for  synchronizing
       clocks among multiple players.

       undo -- undoes the last move whether it was the computer's
       or the human's. You may also type "remove". This is equiv-
       alent  to  two  "undo's"  (e.g.  retract one move for each
       side).

       white -- causes the computer to take the white pieces.  If
       the  computer  is  to  move  first  the go command must be
       given.

       xget -- read an xboard position file.

       xwndw -- change X window.  The  window  around  alpha/beta
       used to determine whether the position should be scored or
       just estimated.


BUGS


SEE ALSO

       chesstool(6)
       xboard(6)










 

 

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