+.TH ADVENTURE 6
+.SH NAME
+gnuchess \- The Technology Chess Program for GNU Unix
+.SH SYNOPSIS
+.B gnuchess
+[
+.BI \-n
+]
+.SH DESCRIPTION
+.I Chess
+plays a game of chess against the user. Or it plays against
+itself. Or it referees a game.
+.PP
+.I Chess
+has two display modes. The first mode is simply a normal
+mode that you could use with a terminal. The second mode
+is a fancy display mode you can use with a SUN workstation.
+To use the former, simply type 'gnuchess'. To use the
+latter, simply type 'chesstool gnuchess' on a SUN
+workstation where 'chesstool' is installed. In the
+latter example, the argument should be the path
+specifying where to find the gnuchess binary.
+.PP
+The following documentation assumes you are in
+the first mode (e.g. normal mode using a regular
+terminal). If not, then you should read the chesstool documentation.
+.PP
+For help once in
+.I Chess
+type a question-mark. To type in your 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.
+The letter indicates the column with the left-most
+column being "a" and the right-most column being "h".
+The number indicates the row, the first row (White's
+first rank) being "1" and the last row (Black's
+first rank) being "8". To castle, type the origin
+square of the king and the destination square of the
+king, just as you would do for a regular move.
+.PP
+The "bd" command prints what the current board position
+looks like. You may type this to see what the board
+looks like after the computer moves.
+.PP
+The "book" command compiles the opening book into
+dbm(3) format. This book is then consulted
+whenever the computer makes a move. If the current
+position is in the book, then the suggested move
+associated with that position will be made as
+the computer's move. Note that this command is a
+maintenance command, usually used only once per
+site per book.
+.PP
+The "depth" command allows the user to change how many
+moves ahead the computer looks. Normally, it looks ahead
+three half-moves, examining every move for each side.
+Then, it examines all captures for both sides for another
+two half-moves. "Depth" changes the first of these values.
+There is an upper boundary of five half-moves as set by
+the quiescence search which searches captures a little
+deeper to get better tactical play.
+.PP
+The "enter" command causes the current game played thus
+far to be entered in the human-readable version of the
+opening book. If no current game is in progress, this
+command requests the name of a file from which to read
+games. These are then added to the binary database.
+Since the versions of the two files are slightly different,
+in the former case, you must additionally type "book"
+to get the new game fully entered in the book.
+Also, the "enter" command tries to mail your new additions
+to the book maintainers
+so that your contributions can be added to the master copy
+of the book. If you are not on our network, you should send
+us your new additions via some other method.
+.PP
+"Fill" allows the user to specify a completely different
+board position. Input is based on Forsythe notation.
+For example, the opening position in Forsythe notation
+is "rnbqkbnrpppppppp8888PPPPPPPPRNBQKBNR+". Capital
+letters indicate a White piece, lower-case Black. A plus means
+it is White's move, a minus means Black's.
+.PP
+"History" and "historyf" list the game as played so far
+to the terminal and a file respectively. The file is
+assumed to be "GAMES/chXXXXXX" where XXXXXX is a random
+number and GAMES is a subdirectory. If GAMES does not
+exist, an error message is reported. The equivalent of
+"historyf" is done after every move automatically to
+record the game thus far.
+.PP
+"Legals" shows legal moves for the current position along with
+the rating for each move based on a positional presort.
+.PP
+"Neither" instructs the program to play neither side, that is,
+to simply act as a referee.
+.PP
+"Reset" resets the board to the starting position.
+.PP
+"Quit" exits the game.
+.PP
+"Read" restores a game as if you were still playing it.
+The game must be in the format as written by "historyf" or
+as automatically recorded by the program itself after every
+move.
+.PP
+"Self" causes the program to play against itself.
+.PP
+"Static" causes a static evaluation to be done for the
+current position. A static evaluation is based on material
+difference only. Positional considerations are handled
+by the ply-1 positional presort.
+.PP
+"Switch" causes the program to move, whether or not it
+is the program's turn to do so. Continually typing
+"switch" is equivalent to typing "self".
+.PP
+"Test-moves" initiates a test of the speed of the move
+generator. An initial series of move generations is done for the
+opening position and the timing speed is reported.
+Then, for each of ten stored test positions, a series of
+move generations is done and the timing speed is reported
+for each one. Finally, the program averages across those
+ten runs and reports the overall average.
+.PP
+"Test-search" uses the ten stored test positions to
+actually conduct a search at the current depth to
+choose a move for each position.
+.PP
+"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
+The flag-option on the command line allows specification
+of how deep to search in half-moves as with 'Chess -3'
+to search three half-moves ahead. Capture searches are
+normally carried out a few half-moves further than the
+regular full search specified with this option. This
+is known as the quiescence search and it usually is
+conducted to 6 ply. This option is identical to the "depth"
+command once in the program.
+.SH BUGS
+.PP
+En passant is not currently implemented. Also, promotion
+to pieces other than queens is disallowed. Checks and
+checkmates are not detected in the tree-search and
+are not handled as "forcing" variations.
+.PP
+There are other bugs. Suggestions for improvements
+and caveats are contained in the files README and TODO
+which come with this distribution.
+.SH AUTHOR
+.nf
+Stuart Cracraft Stuart Cracraft
+P.O. Box 13123 UCLA, Dept. of Mathematics
+Torrance, Ca. Los Angeles, Ca.
+90503 90024
+(213) 214-1136 (213) 825-9040
+.fi
+.SH AUTHOR'S COMMENT
+.PP
+This software is being made available by the Free Software
+Foundation under the restrictions described in its license
+agreement which accompanies this distribution. This software,
+its sources, binaries, documentation and all associated parts
+are copyright (C) 1986 by the Free Software Foundation, Inc.
+.SH SEE ALSO
+.nf
+chesstool(6)
+dbm(3)
+.fi
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