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Gukesh vs Andrei Volokitin, London Chess Classic 2023

What is the surprising move that Gukesh came up with in this position?
Black's last move was Ne6. What did Gukesh (White) do in this position?
The black knight has jumped to b4. What will you play as White here?
Gukesh has expanded on the kingside. How did he (White) proceed further?
Attack has ripened here. White to play and crash in.
The final question of the game. If you find this move as White, you take home the full point.