Chess Puzzle #atO20 — Advanced, White to move, middlegame

Position

White: king g1; queen e6; knight e4; pawns a3/c4/e3/f2/g2/h3. Black: king g8; queen b2; rook d8; knight b8; pawns a7/c5/f6/g7/h7. Black is ahead by 4 points of material. White to move.

Solution (5 moves)

1. Opponent setup: Kh8 — king g8→h8. Now White to move.
2. Best move: Nd6 — knight e4→d6. Opponent replies Qa1+ (queen b2→a1, gives check).
3. Best move: Kh2 — king g1→h2. Opponent replies Qe5+ (queen a1→e5, gives check).
4. Best move: Qxe5 — queen e6→e5, captures queen. Opponent replies fxe5 (pawn f6→e5, captures queen).
5. Best move: Nf7+ — knight d6→f7, gives check. Opponent replies Kg8 (king h8→g8).
6. Best move: Nxd8 — knight f7→d8, captures rook.

Tactical themes

advantage, endgame, fork, quiet move, very long. The key move is Nd6.

Position data

FEN: 1n1r2k1/p5pp/4Qp2/2p5/2P1N3/P3P2P/1q3PP1/6K1 b - - 0 31

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