Chess Puzzle #KLyET — Advanced, White to move, opening

Position

White: king e1; queen e2; rooks a1/h1; bishops b2/b5; knight b1; pawns a4/b4/c2/d2/f2/f5/g2/h2. Black: king b6; queen f7; rooks a8/h8; bishops c8/f8; knights c6/f6; pawns a7/b7/c7/d5/e7/g7/h7. Black is ahead by 2 points of material. White to move.

Solution (4 moves)

1. Opponent setup: a6 — pawn a7→a6. Now White to move.
2. Best move: Qe3+ — queen e2→e3, gives check. Opponent replies d4 (pawn d5→d4).
3. Best move: Bxd4+ — bishop b2→d4, captures pawn, gives check. Opponent replies Nxd4 (knight c6→d4, captures bishop).
4. Best move: Qxd4+ — queen e3→d4, captures knight, gives check. Opponent replies c5 (pawn c7→c5).
5. Best move: Qxc5# — queen d4→c5, captures pawn, delivers checkmate.

Tactical themes

mate, mate in 4, opening, very long. The combination ends with Qxc5# delivering checkmate.

Position data

FEN: r1b2b1r/ppp1pqpp/1kn2n2/1B1p1P2/PP6/8/1BPPQPPP/RN2K2R b KQ - 0 11

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