(1) Tan,Derek (2149) - Unruh,Charles (1755) [B07]
108thUSOpen (1), 31.07.2007



1.e4 d6 2.d4 Nf6 3.Nc3 g6 4.Be3 c6 5.f3 Nbd7 6.Bc4 b5 7.Bb3 Bg7
[RR 7...Nb6 8.Nge2 Nc4 9.Bxc4 bxc4 10.0-0 Bg7 11.Qd2 Qc7 12.Ng3 Ba6 13.f4 Ng4 14.f5 Nxe3 15.Qxe3 Qb6 16.Nge2 0-0 17.Rf3 h5 18.Raf1 Kh7 19.Qg5 Bf6 20.Qe3 g5 21.Rh3 Kh6 22.Qf3 Roux,J-Ferriere,P/Montigny le Bretonneux 2004/EXT 2006/1-0 (34)]

8.Qd2 a5 9.a4N
[RR 9.a3 Bb7 10.Nce2 0-0 11.g4 c5 12.c3 b4 13.Nh3 a4 14.Bc4 d5 15.Bxd5 Nxd5 16.exd5 Nb6 17.Bh6 Nc4 18.Qc1 bxa3 19.bxa3 Qxd5 20.0-0 e5 21.Bxg7 Kxg7 22.Rb1 Bc6 23.Ng3 h6 Surmont,Y-Gurevich,M/Gent 1995/EXT 98/0-1]

9...b4= 10.Nd1 0-0 11.Ne2 Ba6 12.0-0 c5 13.c3 Qc7
[13...Qb6= ]

14.Nf2 Rab8 15.c4
[15.Rfc1= ]

15...cxd4 16.Nxd4 Nc5=/+
15.c4 results in a good variation of the bind for Black.

17.Rfc1!?
[17.Ba2=/+ ]

17...Rfc8!?
Black misses the complex Knight captures King Pawn for the advantage. [17...Nfxe4 18.Nxe4 Bxd4 19.Bxd4 Nxb3 20.Qh6 f6 21.Be3 Nxa1-+ ]

18.Bd1 Qd7 19.b3 Bb7 20.Rab1 Nh5 21.Be2 Rd8 22.Nb5 Rbc8 23.Rd1
An attempt to mix it up. Safer was 23...Nf6.

23...f5!? 24.exf5 gxf5 25.Nd3+/- Nxd3 26.Bxd3 Kh8 27.Bb6 Rg8 28.Qg5?
[28.Kh1+- ]

28...Bxf3!= 29.Qxf5 Qxf5 30.Bxf5 Bxd1
[30...Bh6!-/+ ]

31.Rxd1 Rb8 32.Bc7
[32.Bxa5+- ]

32...Rb7 33.Be4 Rxc7 34.Nxc7 Nf4 35.Nd5 Bd4+= 36.Kh1 Nxd5 37.Rxd4 Nf6 38.Bf3 Rg5 39.Kg1 Kg7 40.Kf2 Nd7 41.Be4 Nc5 42.Bc2 h6 43.h4 Re5 44.Rg4+ Kf7 45.Rf4+ Kg7 46.Rd4 Kf7 47.Rg4 Re6 48.Rf4+ Rf6
After the Rook trade Black should hold the draw with ...e5 ->e4 after trading the h6 Pawn. In most cases the Bishop and outside Pawn are stronger in the ending against the Knight.

49.Ke3 Rxf4 50.Kxf4 Kf6 51.Kg4 e6 52.Kh5 Kg7 53.g4 d5
[53...e5! The White King Rook Pawn is Queening on the wrong color given the White Squared Bishop. Once Black plays e5->e4 the White Bishop must stop the e Pawn at the cost of the Queenside Pawns. 54.g5 hxg5 55.Kxg5 (55.hxg5? Ne6 56.Kg4 Nd4 57.Bd1 Kg6-+ ) 55...Ne6+ 56.Kg4 Nd4 57.Bd1-/+ ]

54.cxd5 exd5 55.g5 hxg5?
[55...d4 56.Bd1 d3-+ ]

56.Kxg5 d4+/-
[56...Ne6++/= ]

57.Kf4 d3 58.Bd1 Kh6 59.Ke5 1-0