Chess · Stage 0: The board
Check and getting out of it
Check is not the end of the game, but you must answer it straight away.
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A king that is attacked is in check, and must get out of check at once. There are three ways. Move the king, block the line, or take the piece giving check. If two pieces give check at once, only moving the king works.
More practice, free: Mate-in-one puzzles from real games, on Lichess.