Sergei Zhigalko: 36...Bb1? (blitz, 2026-08-15)

Deep puzzles: what the analysis missed

8 moves

Sergei Zhigalko to move, Black. Lichess's analysis gave the move played no mark (-0.95 before, -0.67 after). A 20-million-node search calls it a mistake, 11 win-chance points against a best move that is unique. Find it before opening the sideline.

The game move. Lichess: -0.95 to -0.67, no label. At 20M nodes: inaccuracy, 6.7 win% given up, 11 points worse than Bc2.