Former world champion Vishy Anand just played Qb5, to reach the position showed in the diagram. A few seconds later — while his opponent (grandmaster Shakhriyar Mamedyarov) was away from the board — Anand resigned. And when Mamedyarov came back to the chessboard, he asked Anand: “Why did you resign?”
It’s Black to play and win: Can you find the ingenious and crushing move for black?
