Consider a player who is in check. Suppose they can make a move that would putcheckmate the opponent in checkmate, but would not stop themselves from being in check. Would that be a legal move?
For example, in the position below, if Black plays ...Rf8Rf8
, it will put the White king in checkmate, but the Black king will still be in check. Is this move legal?
[FEN "K7/8/2n5/1r6/8/8/3k3R/5r2 b - - 1 0"]
[StartFlipped "0"]
(To be clear, Note that this position is displayed from White’s point of view, even though it is Black’s move.)