Steadman,M (2275) - Van Riemsdijk,H (2401) [A58]Queenstown Classic Queenstown, New Zealand (9.8), 23.01.2012
1.d4 c5 2.d5 Nf6 3.c4 b5 4.cxb5 a6 5.bxa6 g6 6.Nc3 Bxa6 7.Nf3 d6 8.g3
Black underestimates white's temporary pawn sac. Better is 24...Rxa2 25.Nxf6+ exf6 26.Ra1 Qa6 27.e4 And black has more than equalised.
25.a4 Nc7 26.Bc3!
Protecting the pawn doesn't work 26.Nc3?! c4 27.bxc4 Nxc4 28.Rxb8 Rxb8 29.Ne2 Nb2 30.Qc2 Bxa4 31.Qe4
26...Nbxd5 27.Bxg7 Kxg7 28.Nxd6!
Now black's strong bishop which he tried to save being traded with 24.... Bg7 has left the board, and he is still a pawn down.
28...exd6 29.Bxd5 Nxd5 30.Qxd5 Ra6 31.h4
The key point to this position seems to be the weak hanging pawn's at d6 and e5.
White's knight on f1 has some nice squares to work with to attack these pawns and help with the advance of white's queenside pawn's
31...Be6 32.Qd3 Rb4 33.Nd2 Qa8?!
Better is 33...Rab6
White hits on the winning plan of pushing a pawn to e5 a typical motif in the Benko. 34.Qc3+ Kg8 35.e4 Qb7 36.e5 d5 37.Qxc5 Rc6 38.Qe3 Qc7
34...Kg8 35.Qc3 Rab6
35...Qb7 Transposing to the variation above was black's best.
Suddenly black's position is under some strain
36...Rc6 37.exd6 Rxd6 38.Nf3 Qc6 39.Rb2 Rd5 40.Rd2 (40.Ne5 Qd6 41.Nc4 Qb8 42.Rxe6 fxe6 43.Qe3 Qe8 44.a5²) 40...Qa8 41.Rde2 Rf5 42.Ng5 Qd5 43.Nxe6 fxe6 44.a5 Rxb3 45.Qc2 Rbf3 46.a6±
37.Rbc1 Qb8? 38.exd6?!
38.Nc4! Rxb3 (38...Rb7 39.Nxd6 Rd7 40.Nxf5 gxf5 41.Qf3 Rxb3 42.Qxf5 Rd8 43.Rxc5 Rb2 44.e6 It is mate soon to follow.) 39.Qa5 Rc6 40.exd6 Rc8 41.Re7 Rd3 42.Qe1 Qb3 43.a5 Rd4 44.Re8+ Rxe8 45.Qxe8+ Kg7 46.Qe5+ Kg8 47.Ne3 Qa2 48.Kg1 Qe6 49.Rxc5 Qxe5 50.Rxe5 Be6 51.a6 Rxd6 52.Ra5+- 38...Rxd6 39.Re3 Be6?
40.Ne4 Rdd4 41.Nxc5 Bd5 42.Kg1 Qc8 43.Kf1 Bc4+
The position has become extremely tense. White is two pawns up and is now winning. Black has started a tactical sequence going for his best chance to complicate matters.
Throwing away the New Zealand championship in one move. Remembering at move 40 each player gets an extra 60 minutes this is quite an unbelievable mistake. A typical one for a last round of a tournament when so much is at stake. 44.bxc4!Winning is simply taking the piece but the point of this move is
easy to see. 44...Qxc5 (44...Rbxc4 45.Qxc4+-) 45.Re8+ Kh7 46.Rc8!+-
Letting white off the hook. 44...Rxd3 45.Rxd3 Bxd3+-+ And white must lose a piece. 46.Kg1 Qxc3 47.Rxc3 White doe have two pawns for the piece but they are too weak to cause any problems for black 47...Be4 48.a5 Bb7 49.Kf1 Rb5 50.Ke2 Rxa5-+
45.Ke1 Ba6 46.Rd1 Qd7?
The final mistake.
46...Qg2= 47.Qc5 Qh1+ 48.Kd2 Qb7 49.Kc1 (49.Ke1 Qh1+ 50.Kd2 Qb7=) 49...Rbc4+ 50.bxc4 Rxc4+ 51.Qxc4 Bxc4 52.Nb2 Be6 53.Rdd3=
Basically trading two rooks for the queen where white's 2 extra pawns will be a simple win. 47.Qxb4 Rxb4 48.Nxb4 Qa7 49.Nxa6 Qxa6