BLUNDERS, BLUNDERS AND BLUNDERS

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Avatar of chotua1
Rarest checkmates is a well discussed topic. What about blunders??????? been wondering what is the rarest BLUNDER in chess. After some thinking I only got one idea: Checking a king and when the king moves, you get checkmates with a discovered attack. Any other ideas?????
Avatar of SacrifycedStoat
Cheating the king and leaving the opponent with one legal move. Their only legal move is en passant checkmate.