Chess Puzzle #CGYYt — Expert, Black to move, middlegame

Position

White: king g2; queen d5; rooks a1/h1; bishops c4/g3; knight d2; pawns a2/b2/c3/d4/e4/f2. Black: king e8; queen f6; rooks d8/h3; bishops g4/g7; knight h4; pawns a7/c7/d6/e5/g5. White is ahead by 1 point of material. Black to move.

Solution (4 moves)

1. Opponent setup: Bxh4 — bishop g3→h4, captures knight. Now Black to move.
2. Best move: Bf3+ — bishop g4→f3, gives check. Opponent replies Kxh3 (king g2→h3, captures rook).
3. Best move: g4+ — pawn g5→g4, gives check. Opponent replies Kh2 (king h3→h2).
4. Best move: Qxh4+ — queen f6→h4, captures bishop, gives check. Opponent replies Kg1 (king h2→g1).
5. Best move: Qxh1# — queen h4→h1, captures rook, delivers checkmate.

Tactical themes

deflection, discovered attack, master, mate, mate in 4, middlegame, sacrifice, very long. The combination ends with Qxh1# delivering checkmate.

Position data

FEN: 3rk3/p1p3b1/3p1q2/3Qp1p1/2BPP1bn/2P3Br/PP1N1PK1/R6R w - - 4 24

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