fixed bishop + added pawn promotion + added move log

implemented bishop rules

introduced status codes for get_location to produce detailed error messages + added knight rules

completed pawn rules + bug fixes for 4-char-moves

fixed crucial bug where both players could move at the same time + added pawn rules (TODO: en passant)

completed eval_move

interface for retrieving locations when using short algebraic notation

added network messages for check and checkmate

(0) -10 -8 +8 +10 +30 tip

mercurial