r1bqkbnr/pppp1ppp/2n5/4p3/2B1P3/5Q2/PPPP1PPP/RNB1K1NR w KQkq - Best move: Qf7#
r1bqkbnr/ppp2ppp/2n5/4p3/2B1P3/5Q2/PPPP1PPP/RNB1K1NR w KQkq - Now Qf7+ leads to Kg8 and no forced mate → position shredded into a mere winning attack. chess puzzles shredder
Brittle puzzles collapse after 1–2 shredding ops (e.g., remove the knight delivering smothered mate → no threat). Ultra-resilient puzzles (e.g., Saavedra position) remain winning even after downgrading queen to rook and moving a pawn. We shredded 100 puzzles from the Lichess Puzzle Database (rated 1500–2500). chess puzzles shredder