Thursday, 21 March 2019

Back in Contention

After a couple of hiccups early in the season, Aberystwyth are getting back into contention for the Dyfed League title 1n 2019. On Monday 4 March at the Emlyn Cafe, Tanygroes, Aber were in imperious form against Steynton C, helped in places by some convenient errors from their opponents. Rudy van Kemenade was unfazed by Colin Denham' unusual (perhaps improvised?) variation of the Sicilian, which simply lost a pawn without compensation, after which White remained in firm control. Adam Watkin-Jones had reached a level position against Scott Hammett's Stonewall Attack when a miscalculation by White dropped a piece, with the game following soon after. James Cook's Ruy Lopez against Ray Greenwood was a fierce struggle; White won the exchange but Black had two powerful bishops and found some counterplay before being outplayed in the ending. Sam Holman went a pawn up in another Sicilian against Gwyn Evans, but the ending with opposite-coloured bishops should have been drawn till White dropped his bishop to a pawn fork. The result was 4-0 to Aber.

A couple of weeks later, Aber entertained league leaders Cardigan A at home. Rudy's unusual opening brought about a position that may have bemused Iolo Jones, since he soon lost a pawn in a complex game which I don't even begin to understand. At any rate Black retained the advantage and went on to win the ending. Adam, bizarrely, was the beneficiary of a very similar error to the one which had won him a piece and the game against Scott Hammett in the previous match, and Tony Haigh resigned at once. After a quiet Queen's Pawn Game opening, Julie van Kemenade found a kingside attack against Ben Brewer, but White's position didn't seem to have any weaknesses, and his sudden counter-attack was devastating. I built up a strong central position against Awne Osinga's Modern Steinitz Defence to the Ruy Lopez, and broke through with my e-pawn to win a piece. After that I had some problems with a blocked-in bishop but was able to sacrifice it back to reach a winning position. Aber's 3-1 win avenged their defeat earlier in the season, and keeps them close behind Cardigan A in the League.

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1.e4 c5 2.Nf3 g6 3.d4 b6 50 odd games with this 3...cxd4 3...Bg7 main lines 4.dxc5 4.Nc3 scores even better, though it may just transpose to the text 4...bxc5 5.Qd5 5.Bc4+- Stockfish10 prefers to not take the pawn e6 6.Nc3 Ba6 7.Bxa6 Nxa6 8.e5 Yardim-Kavrut, Tukish Cup, Antalya 2017,1-0 5...Nc6 6.Qxc5 6.Ne5 Stockfish10 e6 7.Nxc6 Qb6 8.Qe5 f6 9.Qg3 Qxc6 10.Nc3 Bd6 11.Bf4 e5 12.Be3+- Nguyen-Thao,Nam THCS Dong Thap 2000,1-0 6...Bg7 6...Bb7 7.Nc3 e6 8.Qb5 Qc8 9.Bd2 Ba6 10.Qxa6 Qxa6 11.Bxa6 Nb4 12.Bd3 Stoelzel-Janocha, DESC email 2006,1-0 6...Qa5+ 7.Qxa5 Nxa5 8.Bd2 Nc6 9.Bc3 Nf6 10.Bc4 Bg7 11.Nbd2 Llaneza Vega-Alvarez, Asturias ch U12 ,1998,1-0 7.Nc3 Stockfish10 7.c3 main, 6-1 7.Bd3 Qc7 8.Nc3 d6 9.Nd5 Qb7 10.Ba6 10.Qe3± 10...dxc5 10...Qxa6-+ 11.Bxb7 Bxb7 12.Nc7+ Kd7 13.Nxa8 Bxa8 Huyet-Brugge, La Fere op 2012,0-1 7...Bb7 8.Bd2 8.Bc4 Stockfish10- considered Rc8 8...Bxc3+ 9.bxc3 Qa5 10.Qxa5 Nxa5 11.Bd3± Wh thought Bl might have some play on the c file 9.Qe3 Qb6 10.0-0 Qxe3 11.Bxe3 Nf6 12.Rfd1 d6 13.h3 0-0 14.Bb3 Na5 15.Nd2± 8...Rc8 8...d6 9.Qe3 e6 10.Bb5 Nge7 11.0-0 0-0 12.a3 Qc8 13.Rfe1 a6 14.Bd3 Ne5 15.Nxe5 Bxe5 16.Rab1 Nc6+- Wegner-Krolak, POL ch tm IV liga szachowa 2011,0-1 - Wh blundered a R on move 42 in a winning position 9.Qe3 9.Bd3 considered- eventual Stockfish10 first choice Nf6 9...Ne5 10.Qxa7 Nxf3+ 11.gxf3 Bc6 12.0-0+- considered 10.0-0 0-0 11.h3± 9.Qb5 Rb8 10.Bd3 Ba8 11.Qa4 Rxb2 12.0-0± Stockfish10, but there is no need to return the pawn yet 9...Nb4 9...Bh6 10.Qe2± considered 9...Nf6 10.h3 Wh must be careful as Bl can easily get play in return for the pawn 10.Bc4 10.Bd3 10...d5 11.exd5 Nxd5 12.Nxd5 Qxd5 13.Qb3 Qe4+ 13...Qxb3 14.axb3 Bxb2 15.Ra4 Bg7 16.b4 0-0 17.b5 Ne5 18.Nxe5 Bxe5 19.Rxa7 Rfd8 20.Rxb7 Rxc2 21.Rxe7 Bf6 22.Bb4 Rc1+ 23.Ke2 Rc4 24.Ba5 Bxe7 25.Bxd8 Bxd8 26.Kd2 Ba5+ 27.Kd3 Rb4 28.Kc2= Stockfish10 14.Kd1 Nd8 15.Bd3 Qe6 16.Bb5+ Kf8 17.Qxe6 Nxe6 18.c3 Nc5 Stockfish10 10.Bd3 10.Rc1 Qb6 11.Qxb6 axb6 12.Bb5± Stockfish10 10...Ba6 11.Rc1 safest 11.a3 considered Nxd3+ 11...Bxd3 12.axb4 Bxc2 13.Nd4 Stockfish10, missed Bxd4 14.Qxd4 Nf6 15.Rxa7+- 12.cxd3 Qb6 13.Qxb6 axb6 14.Ke2± 11.0-0 Bxd3 12.cxd3 Nc2 13.Qxa7 Nxa1 14.Rxa1± considered 11.Qe2? Nxc2+ seen 12.Kf1 Bxd3 13.Qxd3 Nxa1-+ 11...Bh6 12.Qd4 Bxd2+ Bl should play the moves in a different order 12...Nxd3+ 13.cxd3 Bxd2+ 14.Nxd2 13.Nxd2 after consideration of the best way to take back! 13.Kxd2 wins material as Nxd3 14.Qxh8 Nxc1? 15.Qxg8# 13...Nxd3+ 14.cxd3 f6 14...Nf6 15.e5 Nh5 16.0-0 0-0 17.Nc4+- Stockfish10 15.0-0 Qb6 after the d pawn , but Bl is way behind in development 15...Kf7 16.b4 e5 17.Qd5+ Kg7 18.b5 Ne7 19.Qd6 Bb7 20.Na4+- Stockfish10 16.Qxb6 axb6 17.Nd5 Rxc1 17...Kf7 18.Rxc8 Bxc8 19.Rc1 Nh6 20.Rc7 Rd8 21.a4 Ba6 22.d4 Rb8 23.Rxd7+- Stockfish10 18.Rxc1 Bxd3 19.Rc8+ Kf7 20.Nxb6+- Ba6 21.Ra8 Bb7 22.Rb8 22.Ra7 wins another pawn, but lets Bl R out 22...Bc6 23.a4 h5 24.b4 d6 25.b5 25.a5 Bb5 26.Nd5 Bd3 27.b5 transposes to something like the game 25...Be8 26.Nd5 26.Rxe8 Kxe8 27.a5 Kf7 27...Kd8 28.a6 Kc7 29.Ndc4 e6 30.a7 Ne7 31.a8Q Rxa8 32.Nxa8+ Kb7 33.Nab6+- 33.Nxd6+ Kxa8 34.Ne8 f5 35.e5 Kb7 36.Ng7 Kb6 37.Nxe6 Kxb5 38.f4+- 28.a6 Nh6 29.a7+- considered 26...f5 27.a5 27.b6 Bxa4 considered & pm analysis 28.Nb4+- Stockfish10 28.b7 Bc6 29.Rf8+ Kxf8 30.b8Q++- 27...fxe4 27...Bxb5 at once 28.Nxe4 28.a6 28.b6 28.Nc7 28...Bd7 28...Bxb5 at once 29.a6 Bxb5 30.Ng5+ 30.a7 Bc6 31.Ng5+ Kg7 32.Nb4 30...Kg7 31.Ne6+ Kf7 31...Kh7 32.Nf8+ 32.a7 Bc6 33.Nb4 Be4 34.Ng5+ Kg7 35.Nxe4 32...Kh6 33.Rxb5 Nf6 34.a7 34.Rb8 Nxd5 35.a7 Nc7 36.Ne6 34...Rxf8 35.Rb8+- 32.Nd8+ interupting the Bl R stopping the pawn 32.Ndc7 Kf6 33.Rxb5 Nh6 34.a7 Stockfish10 32...Kg7 32...Ke8 33.a7 33.Nc7+ Kd7 34.Nxb5 33.a7 for the moment material is still level. 1–0
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WhiteEloWBlackEloBRes
Van Kemenade,R2021Denham,C16301–0
Hammett,S1533Watkin-Jones,A19280–1
Cook,J1496Greenwood,R12841–0
Evans,G1300Holman,S13700–1
Watkin-Jones,A1928Haigh,A17881–0
Brewer,B1555Van Kemenade,J17611–0
Francis,M1712Osinga,A13501–0
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