[Event "ICCD World Individual Championships"] [Site "Yerevan, Armenia"] [Date "2016.05.24"] [Round "8"] [White "Kreuzer, Chris"] [Black "Kudrashou, Siarhei"] [Result "1-0"] [ECO "B40"] [Opening "Sicilian: Open, 2...e6, 4.Nxd4"] 1.e4 c5 {A surprise, I had prepared for 1...e5.} 2.Nf3 e6 3.d4 cxd4 4.Nxd4 d6 5.Nc3 a6 6.Bc4 b5 7.Bb3 Nf6 8.a3 Bb7 9.f3 {Expecting my opponent to play 9...Nbd7, but he thought for a long time and developed his f8 bishop instead. A strange decision as it allows a standard sacrifice on e6.} Be7 10.Bxe6 fxe6 11.Nxe6 Qb6 {This is not the right square for the queen.} 12.Nxg7+ Kf7 13.Nf5 {Black has problems defending d6, and my bishop is developing to e3 with tempo, though possibly it should have gone straight to f4.} Re8 {Black needed to develop his b8 knight and bring the a8 rook into the game. The move played in the game is too slow.} 14.Be3 Qc7 15.Bf4 Rd8 16.Qd2 Nc6 {The b8 knight can develop either to c6 (as in the game) or to d7. If it goes to d7, the d6 pawn is lost, but this may be better than what happened in the game.} (16...Nbd7 17.Bxd6 Bxd6 18.Qxd6) 17.Nd5 {I had calculated several winning lines here, but missed the one played in the game until after playing this move. Luckily that line is also winning for White.} Nxd5 (17...Qb8 18.Ndxe7 Nxe7 19.Nxd6+) (17...Qd7 18.Ndxe7 Nxe7 19.Nxd6+) (17...Qc8 18.Ndxe7 Nxe7 19.Nxd6+ Rxd6 20.Bxd6) 18.Qxd5+ Kf6 {This was the move I had missed, not realising that the f6 square would be available after the exchange of knights. I settled down to calculate which of h4 or g4 to play, and was reasonably confident one of them would win. When I played h4, I had calculated all the winning lines.} (18...Kf8 19.Bh6+ Ke8 20.Ng7+ Kf8 21.Ne6+ Kg8 22.Nxc7+) (18...Ke8 19.Ng7+ Kf8 (19...Kd7 20.Qe6#) 20.Ne6+) (18...Kg6 19.Qe6+ Bf6 (19...Kh5 20.g4#) 20.Nh4+ Kg7 (20...Kh5 21.Qg4#) 21.Bh6+ Kh8 (21...Kxh6 22.Qxf6+ Kh5 23.g4#) 22.Qxf6+) 19.h4 {Threatening mate, starting with 20.Bg5+. Black has to cover e6 with the queen or bishop. There was one line I missed, the move 19...Rf8 to cover f6.} Qd7 (19...Bc8 20.Bg5+ Kg6 21.Qxc6 (21.h5+ Kxg5 22.Nxe7+ Kf6 23.Nxc6) 21...Qxc6 22.Nxe7+ Kf7 23.Nxc6) (19...Rf8 20.Bg5+ Kg6 21.Qe6+ Rf6 (21...Bf6 22.Bh6 Kh5 (22...Rfe8 23.h5#) 23.g4+ Kg6 24.h5#) 22.Bxf6 Bxf6 23.h5+ Kg5 24.Rh4 d5 (24...Nd4 25.f4#) 25.Rg4+ Kxh5 26.Qxf6) 20.g4 {Threatening mate in two with the g-pawn and h-pawn.} h5 (20...Ne5 21.g5+ Kg6 22.h5#) (20...Qe6 21.Bg5+ Kf7 22.Nh6+ Ke8 23.Qxe6) (20...h6 21.g5+ hxg5 22.hxg5+ Kg6 23.Rh6#) 21.Bg5+ {It is mate in four.} {#r} 1-0