http://man.cat-v.org/unix-1st/6/chess
A move is specified by the from co--ordinate followed bythe `to' co--ordinate. Thus the white P--K4 move would be `e2e4'. The black P--K4 would be `e7e5'. The following commands are recognized by the chessprogram: .... move x Make the move regardless of legality. This is a good way to either set up a desired situation or to cheat.The initial move `e2e8x' is a winner.
written by ken thompson in 1971
