What are the specific rules and restrictions governing the capture of an opponent's chess king in a game of chess?

In Chess, the objective is to checkmate the opponent's king, which means putting the king in a position where it cannot escape capture. The king can be captured by moving a piece to a square that attacks the king, known as a check. The opponent must then move the king out of check or block the attack. If the king cannot escape capture, it is checkmated, and the game is over.