Oleksandr Bortnyk: 58...Qa8? (blitz, 2026-08-28)

Deep puzzles: what the analysis missed

8 手

Oleksandr Bortnyk to move, Black. Lichess's analysis gave the move played no mark (-1.87 before, -1.28 after). A 20-million-node search calls it a blunder, 20 win-chance points against a best move that is unique. Find it before opening the sideline.

The game move. Lichess: -1.87 to -1.28, no label. At 20M nodes: blunder, 20.4 win% given up, 20 points worse than Qa7+.