Sergei Zhigalko: 52.Rh6+? (blitz, 2026-07-14)

Deep puzzles: what the analysis missed

8 moves

Sergei Zhigalko to move, White. Lichess's analysis gave the move played no mark (+1.71 before, +1.19 after). A 20-million-node search calls it a mistake, 10 win-chance points against a best move that is unique. Find it before opening the sideline.

The game move. Lichess: +1.71 to +1.19, no label. At 20M nodes: inaccuracy, 7.2 win% given up, 10 points worse than Rxb7.