Chess is a game played between two sides, white and black, where the objective is to checkmate the opponent's king. Players can lose if they make three illegal moves or run out of time on their clock, which is set between 1-60 minutes depending on the type of game. Tactics in chess include skewers, where a piece attacks another piece that is blocking checkmate of a piece behind it, decoys which sacrifice a piece to enable capturing another, and discovered attacks where a piece moves from in front of another, allowing it to attack. Good bishops control more space while bad bishops have their range limited by pawns. Square clearance opens up space for bishops.