I Built a Chess Engine. Stockfish 19 Dismantled It in 21 Moves

My custom-built chess engine got crushed by Stockfish 19 in just 21 moves. It castled, won a pawn, and still ended up with the king in trouble. Fisherman is my own chess engine, playing White with about half a second per move against Stockfish 19. What starts as a Scotch Game becomes a lesson in how an attack is built: a bishop chase opens the H-file, a quiet king move clears the back rank, and two sacrifices pull White's defense apart. We follow the ideas behind the moves, including why White can't recapture with the F-pawn, where it could have defended better, and how the rook that never moved becomes the piece that delivers checkmate. CHAPTERS 00:00 My engine vs Stockfish 19 00:31 The Scotch Game 02:05 Why Stockfish leaves E5 alone 03:16 The bishop chase begins 05:03 The pinned pawn and the open H-file 05:35 Why Stockfish moves its king 06:11 White's better defense 06:41 A trade that helps the attack 07:58 Bringing in the rooks and queen 08:52 The bishop sacrifice 10:04 The rook sacrifice 10:50 Removing the last defender 11:28 Checkmate: the quiet move pays off 12:02 The lesson for my engine Would you have spotted the danger before the H-file opened? Tell me where you would have defended differently. Subscribe to LateNightGambit for more chess stories and explanations of the ideas behind the moves. #Chess #Stockfish #ChessEngine