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-.TH Chess GNU
-.SH NAME
-Chess \- GNU Chess
-.SH SYNOPSIS
-.B Chess
-[
-.B arg1 arg2
-]
-.SH DESCRIPTION
-.I Chess
-plays a game of chess against the user or it plays against itself.
-.PP
-.I Chess
-has a simple alpha-numeric board display or it can be compiled for
-use with the CHESSTOOL program on a SUN workstation.
-The program gets its opening moves from the file gnuchess.book which
-should be located in the same directory as gnuchess.
-To invoke the prgram, type 'gnuchess' or type 'chesstool gnuchess'
-on a SUN workstation where 'CHESSTOOL' is installed.
-The 'gnuchess' command can be followed by up to 2 command line arguments.
-If one argument is given it determines the programs search time in
-seconds.  If two arguments are given, they will be used to set tournament
-time controls with the first argument being the number of moves and the second
-being the total clock time in minutes.  Thus, entering 'chess 60 5' will set
-the clocks for 5 minutes (300 seconds) for the first 60 moves.
-If no argument is given the program will prompt the user for level of
-play.
-For use with CHESSTOOL, see the documentation on that program.
-.PP
-Once
-.I Chess
-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 indicates 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" for kingside castling and "o-o-o" for queenside.
-.SH COMMANDS
-.PP
-In addition to legal moves, the following commands are available as responses.
-.PP
-.I beep
--- causes the program to beep after each move.
-.PP
-.I bd
--- updates the current board position on the display.
-.PP
-.I book
--- turns off use of the opening library.
-.PP
-.I both
--- causes the computer to play both sides of a chess game.
-.PP
-.I black
--- causes the computer to take the black pieces with the move
-and begin searching.
-.PP
-.I 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.
-.PP
-.I 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.
-Using the depth command allows setting depth to say
-4 ply and setting response time to a large number such as
-9999 seconds. The program will then 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). 
-.PP
-.I easy
--- toggles easy mode (thinking on opponents time)
-on and off. The default is easy mode ON.  If easy mode is disabled,
-the user must enter a 'break' or '^C' to get the programs
-attention before entering each move.
-.PP
-.I edit
--- allows the user to set up a board position.
-In this mode, the '#' command will clear the board, the 'c'
-command will toggle piece color, and the '.' command will exit
-setup mode.  Pieces are entered by typing a letter (p,n,b,r,q,k) for
-the piece followed by the coordinate.  For example "pb3" would
-place a pawn on square b3.
-.PP
-.I 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' commands.
-.PP
-.I get
--- retrieves a game from disk.  The program will
-prompt the user for a file name.
-.PP
-.I help
--- displays a short description of the commands.
-.PP
-.I hint
--- causes the program to supply the user with
-its predicted move.
-.PP
-.I list
--- writes the game moves and some statistics
-on search depth, nodes, and time to the file 'chess.lst'.
-.PP
-.I new
--- starts a new game.
-.PP
-.I post
--- causes the program to display the principle
-variation and the score during the search.  A score of
-100 is equivalent to a 1 pawn advantage for the computer.
-.PP
-.I random
--- causes the program to randomize its move
-selection slightly.
-.PP
-.I reverse
--- causes the board display to be reversed.  That
-is, the white pieces will now appear at the top of the board.
-.PP
-.I quit
--- exits the game.
-.PP
-.I save
--- saves a game to disk.  The program will prompt
-the user for a file name.
-.PP
-.I switch
--- causes the program to switch places with
-the opponent and begin searching.
-.PP
-.I undo
--- 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).
-.PP
-.I white
--- causes the computer to take the white pieces
-with the move and begin searching.
-.SH BUGS
-.PP
-Pawn promotion to pieces other than a queen is not allowed.
-En-Passant does not work properly with CHESSTOOOL.
-The transposition table may not work properly in some
-positions so the default is to turn this off. 
-.fi
-.SH SEE ALSO
-.nf
-chesstool(6)
-.fi
-