President's Computer Challenge

Ultimate Computer Challenge Elista RUS (4), 09.06.2007

1.d4 Nf6 2.c4 g6 3.Nc3 d5 4.cxd5 Nxd5 5.e4 Nxc3 6.bxc3 Bg7 7.Nf3 c5 8.Rb1 0-0 9.Be2 Nc6 10.d5 Ne5 11.Nxe5 Bxe5 12.Qd2 e6 13.f4 Bc7 14.0-0 exd5 15.exd5 Ba5 16.f5 Bxf5 17.Rxb7 Qd6 18.Bc4 Qe5 19.Rf3 Rab8 Deep Junior decides to sacrifice a pawn, allowing Fritz a long term passer but gaining a rook attack in compensation. 20.Rxa7 Bb6 21.Ra4 Bc7 22.g3 Rb1 23.Re3 Qf6 24.Ra6 Bd6 25.Re1 Rfb8 26.Bf1 h5 27.a4 c4 A second pawn sacrifice, which was accepted by Deep Fritz. This allowed Deep Junior's second rook to penetrate White's position. 28.Rc6 Ra1 29.Bxc4 Bd7 30.Rf1 Qe7 31.Rxd6 Deep Junior's active piece play has forced Deep Fritz to sacrifice an exchange. 31...Qxd6 32.Qf2 Qb6 33.Bf4? "Fritz lost game four after committing a serious error: 33.Bf4 is losing, and Be3 instead should be a draw." [Alexander Kure]. "A critical moment in the game. This move allows Deep Junior a favorable queen exchange while leaving Deep Fritz's king exposed to threats from the two black rooks. Fritz is forced to defend its king and its pieces, while Junior starts to push its king side pawns." [Shay Bushinsky]. [33.Be3 Rxf1+ 34.Bxf1 Qb1 35.Qf6 Bh3 36.Bd4 Kf8= (36...Qxf1+ 37.Qxf1 Bxf1 38.Kxf1 +/=) ] 33...Qxf2+ 34.Kxf2 Rb2+ 35.Ke3 Rxa4 36.Bd3 Rxh2 "Even 37.Rb1 may still be playable. For example after the thematic h4 Rb8+ Kg7 Rb7 White has enough counterplay. The difference is that after this move White would be active while after the game move 37.c4 White was passive." [Mathias Feist of the Deep Fritz team]. 37.c4 Ra3 38.Kd4 h4 39.g4 Rh3 40.Be2 Rhb3 41.Ke5 Rb2 42.Re1 Raa2 43.Bd1 Ra6 44.Bc1 Rb8 45.Rg1 h3 46.Rh1 f6+ 47.Kd4 Ra1 48.Bc2 g5 49.c5 Bxg4 50.c6 Kf7 51.Rf1 Rh8 52.d6 h2 53.d7 Ke7 0-1

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