Chess, but there are only Knights

Chess, but there are only Knights is a simple adaptation of chess, for two human players only. It is a variant of the author's previous game, Chess. Each player has 16 pieces as usual, but all pieces, save for the king, are knights. Other than that, the rules are the same. The check rules are not fully implemented: a player is not obliged to move out of check, though he cannot move into check. Victory takes place not by checkmate, but by capturing the enemy king.