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• The king is in check if he is attacked by an enemy piece.
• It is against the rules of chess to allow your king to be captured. So, if your king is in check, then you absolutely must do something on the very next move to remove your king from check.
• You can never move your king to a square where he will be in check. Nor can you move one of your own pieces if, to do so would expose your king to check..
• Your king is checkmated if he is attacked, and there is no way to remove him from the attacking check. If you are checkmated you lose the game. If you checkmate your opponent, you win.
• The king is stalemated if, though he is not in check, the only moves available would put him in check. If this happens, the game is declared a draw. Always be on the lookout for ˜stalemate.