chess.6

unix v7是最后一个广泛发布的研究型UNIX版本

.TH CHESS 6 
.SH NAME
chess \- the game of chess
.SH SYNOPSIS
.B /usr/games/chess
.SH DESCRIPTION
.I Chess
is a computer program that plays class D chess.
Moves may be given either in standard (descriptive) notation
or in algebraic notation.
The symbol `+' is used to specify check;
`o-o' and `o-o-o' specify castling.
To play black, type `first';
to print the board, type an empty line.
.PP
Each move is echoed in the appropriate notation followed by
the program's reply.
.SH FILES
/usr/lib/book		opening `book'
.SH DIAGNOSTICS
The most cryptic diagnostic is `eh?' which
means that the input was syntactically incorrect.
.SH WARNING
Over-use of this program
will cause it to go away.
.SH BUGS
Pawns may be promoted only to queens.