Tuesday, 15 June 2021

End of Season

Aberystwyth played our last match of the season on Tuesday 8 June against White Knights. It's been fun playing in the Dyfed Online League and, as here, in the Welsh Chess Union Online Open, though we were certainly outclassed in the latter with the exception of our captain and top board, Rudy van Kemenade. In this last match he duly delivered our only win, with a high-class performance against Allan Pleasants, winning a rook ending with an extra pawn where all the pawns were on the same side - a sure-fire draw for most of us, but Rudy kept up the pressure and induced his opponent's losing error. I was out of my depth against Adam May on the Black side of a Catalan, an opening I know little about, and after a couple of inaccuracies my position was hopeless. Tom Gunn tried a promising-looking combination against Tomasz Miga in a Queen's Gambit, giving up two pieces for a rook and two pawns, but it backfired, leavinng Black's bishope pair dominant, and Tom was soon defending passively against a crushing kingside attack. Finally, Sam Holman attacked without completing his development against Guto Neave's English Opening, and his exchange combination didn't work out, losing a piece. He fought on, surviving longer than Boards 2 and 3, but the odds were always against him. A 3-1 win to White Knights to finsh the season.

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1.Nf3 Avoiding Bl's Modern & Benko gambit lines d6 1...g6 Allan's main response to 1 Nf3, his comment afterwards was that he felt under pressure from move 1! 2.c4 Bg7 3.Nc3 d6 4.d4 Nf6 5.e4 0-0 6.h3 Na6 7.Bg5 e5 8.d5 Van Kemenade-Pleasants, S Wales New Year open 2020,1-0 2.c4 2.d4 Bg4 is the Wade variation, a version of the Modern 2...e5 3.Nc3 Nf6 3...f5 main 4.d4 4.g3 4...exd4 4...Nbd7 5.e4 Be7 Old English, holds the cetre but a little passive. Iolo Jones used to employ it quite freqently. 5.Nxd4 Be7 6.g3 6.e4 considered , is a kind of Maroczy bind, but Wh may have to defend the e pawn, from a later Nc5 & Re8. 6...0-0 7.Bg2 76% for Wh c6 8.0-0 Na6 9.Rb1 deterring Nc5 & perhaps getting in b5 9.b3 79 % for Wh , is simpler eg Qa5 10.Qd2 Qh5 11.Qg5 Qxg5 12.Bxg5 h6 13.Be3 Bevan-Robles, Wales-Mexico email, 2017,1-0 9.e4 89%, also has attractions 9...Nc7 10.Qc2 2nd choice of KomodoDragon2 10.e4 Re8 11.Re1 Ne6 12.Nf5 Bf8 13.b4 Qc7 14.Bb2 Porras Mateo-Gonzalez Garcia, Barcelona La Lira op 2014,1-0 10...d5 11.cxd5 11.Rd1 h6 12.Nf5 Be6 13.Bf4 Rc8 14.Rbc1± KomodoDragon2 11...Ncxd5 12.Nxd5 Wh was content to to exchange a once moved N for a thrice moved one cxd5 12...Nxd5 avoids the isolani 13.Rd1 Nb4 14.Qa4 Bd7 15.Nf3 Qe8 16.Bg5 Nd5 17.Rd2 h6 but Bl has to sit and defend carefully 18.Bxe7 Qxe7 19.Qb3 Rab8 20.Rbd1 Rfe8 13.Rd1 Qa5 13...Bd7 14.Nf5 Rc8 15.Nxe7+ Qxe7 16.Qd3 h6 17.Be3 KomodoDragon2 14.Qb3 Ne4 14...Qb6 might be Bl's best bet 15.f3 15.Be3 is the natural move h6 15...Nf6 16.a3± 16.Qb5 Bd8 16...Qxa2? 17.Ra1 Qc4 18.Qxc4 dxc4 19.Bxe4 17.Qxa5 Bxa5 18.Nb3 Bb6 19.Bxb6 axb6 20.Rxd5 Nf6 21.Rd6 Rxa2 22.Nd4+- KomodoDragon2 15.Bf4 Bd8 16.Rbc1± considered 15...Nf6 15...Nc5 should have been tried according to the Engine 16.Qa3 16.Qxd5 Rd8 17.Qc4 Be6 the d4 N is pinned, missed by Wh 18.Qc3 Qxc3 19.bxc3 Bxa2 20.Ra1 Bb3 21.Re1 Bf8 22.Ba3= 16...Qxa3 17.bxa3 Re8= KomodoDragon2 16.Bd2 Qa6 17.e3 Bd7 17...Bc5 18.Rbc1 18.Bc3 Re8= 18...Bxd4 19.exd4 leaves Bl with the problem QB 18.Bf1 Qa4 19.Qxa4 19.Qxb7! KomodoDragon2 Rfb8 20.Qa6 20.Qb3! one of those Engine ideas Rxb3 21.axb3 Qa2 22.Bc3 and the Q is trapped 20...Rxb2 21.Qxa4 Bxa4 22.Rxb2 Bxd1 23.Rb7 Bc5 24.Kf2± Bl's QB is still unfortunate 19...Bxa4 20.Rdc1 20.b3 and Wh has to think about Ba3 20...Rfc8 21.Nf5 Bf8 22.Bc3 Nd7 23.b3 Bc6 24.Nd4± 24.Bh3!? 24...Re8 25.Kf2 Bc5 26.Bb2 26.b4! Bxd4 27.Bxd4 a6 28.Ra1 Ba4 29.Rc7 Bc6 30.a4 Nf8 31.b5 axb5 32.Bxb5 32.axb5 Rxa1 33.Bxa1 Ne6-+ 32...Rec8 33.Rxc8 Rxc8 34.Rb1 Bxb5 35.Rxb5+- KomodoDragon2 26...Bxd4 27.Bxd4 Ne5 28.Rc3 28.g4 28.a4 28...f6 29.Rbc1 a6 30.a4 Re7 31.Ra1 31.g4 Nf7 32.h4 Ree8 33.Bd3+- KomodoDragon2- preparing for opening up the K sidewhile the Bl pieces remain passive. Oddly enough Rudy & Julie were looking at a game that day which featured a similar idea- tie Bl up on the Q side, then switch to the K side. 31...Be8 (draw?) 31...h5 32.b4 Nc6 33.Bc5 Rf7 34.Rd1 34.Bg2 Rc7 35.Rac1 Bf7 36.f4 Be6 37.g4+- KomodoDragon2 34...Ne5 35.Ra1 35.a5 Bc6 36.Bg2 Rd8 37.f4 Ng4+ 38.Kg1 f5 39.Bb6 Rd6 40.Rdc1 Nf6 41.b5 axb5 42.a6+- KomodoDragon2 35.f4! Bxa4 36.Rxd5 Ng4+ 37.Kg1 Rc7 38.Bc4 Kh8 39.Rcd3 and Wh controls the centre Rcc8 40.Rd6 Nh6 41.Bd5 Rab8 42.Rd2 Rd8 43.Ra2 Bb5 44.Rxd8+ Rxd8 45.Bxb7+- KomodoDragon2 35...Rc8 36.Bh3 36.a5 36...Bd7 37.Bf1 37.Bg2 37...b5 37...h5 38.axb5 38.f4+- Nc4 38...Ng4+ 39.Kg2 f5 40.Rac1 Ra8 41.a5 Rc8 42.Bd4 Rc4 43.h3 Nh6 44.Kf2+- 39.Bg2 Bc6 40.axb5 axb5 41.Rd3 Rd8 42.Rd4 f5 43.h3 Rfd7 44.Bf3 g6 45.g4 Kf7 46.gxf5 gxf5 47.Ra6 Bb7 48.Rh6 Kg7 49.Rh5 Rf7 50.Rg5+ Kf6 51.Rd1 KomodoDragon2 Wh has definite K side chances 38...Bxb5 39.Bxb5 39.Bh3 f5 40.Rd1 Bc4 41.f4 Nd7 42.Bd4 Rb8 43.e4± KomodoDragon2 39...axb5 40.Ra5 40.g4 40.Rca3 40...Rb7 41.Ra6 Nd7 Bl has survived the worst with getting rid of his QB 42.Rd6 42.Bd4 Rxc3 43.Bxc3 Rc7 44.Bd4 Ne5= 45.Bxe5 fxe5 46.Ra5 Rc2+ 47.Kg1 d4 48.exd4 exd4 49.Rxb5 Rb2 the R ending is drawn 42...Nxc5 43.bxc5 43.Rxc5 Rxc5 44.bxc5 b4 45.Rxd5 b3 46.c6 Rc7 47.Rc5 b2 48.Rb5 Rxc6 49.Rxb2 h5= KomodoDragon2 43...b4 44.Rc1 b3 45.Rxd5 b2 46.Rb1 Rbc7 47.Rxb2 Rxc5 48.Rxc5 Rxc5 49.e4 Kf7 50.g4 h5 Fine(1941) as well as Mueller & Lamprecht (2001) recommend the advance of the h pawn to h5 as the best drawing method. The latter citing (p212) Botvinnik-Najdorf, Moscow Alekhine mem 1956,1-0, where Bl's h pawn was on h6, & Wh was able to force through the e pawn. "Is the attacker winning? Theoretically the answer is no, but in practice it is not at all easy to defend....just waiting passively is not sufficient" Mueller & Lamprecht 2001: 212 51.Rb7+ 51.gxh5= KomodoDragon2 Endgame 51...Kg6 52.Kg3 52.h4 hxg4 53.fxg4= 52...hxg4 53.Kxg4 Rc4 53...Rg5+ expected by Wh- holds up h4 54.Kf4 Rh5 55.Rb2 Kf7 56.Rc2 g6 57.Kg3 Rg5+ 58.Kf2 f5 59.h4 Rh5 60.Kg3 fxe4 61.fxe4= KomodoDragon2 Endgame 54.Kf4 54.h4 f5+ 55.Kf4 fxe4 56.fxe4= Endgame tablebases 54...Ra4 55.h4 Ra5 56.Rd7 Rb5 57.Rd5 Rb7 57...Rb1!? 58.h5+ Kf7?! this looks like a slide into error, giving the Wh K space to move into. Bl had been under pressure all game & also short of time 58...Kh6 ties something to defend the h pawn 59.Kg4 Rb1 60.f4 Rg1+ 61.Kf5 Rh1 KomodDragon2 Endgame & Stockfish12 61...Kxh5 62.Rd8 Kh4 63.e5 fxe5 64.Rh8+ Kg3 65.fxe5 and now the move to draw is either Rf1+ or 65...Rg2 65...Re1 66.Rg8!+- 62.e5 Rxh5+ 63.Ke6 63.Ke4 fxe5 64.fxe5 Rh1= 63...fxe5 64.fxe5 Kg5 65.Kd6 Kf4 66.e6 Rh6 67.Kd7 g5 68.e7 Rh7 69.Kd8 Rh8+ 70.e8Q Rxe8+ 71.Kxe8 g4= Nalimov Tablebases 59.Kf5 KomodoDragon2 Endgame, after a spell of reflection, considers this winning, but , though Wh has improved chances, Bl can still hold Ra7 60.f4 Re7? Definitely the losing move- putting the R into a passive position, that does not even hold up Wh's e5. 60...Rb7 keeps the R more active 61.e5 is too early, so Wh has to wait, But there seems to be just a couple of R pirouettes for both sides. fxe5 62.fxe5 Ke7= Lomonosov Tablebases 60...Rb7 61.Ra5 Rc7 62.Ra6 Rb7 63.h6 63.Rd6 and the Engine keeps going round in circles 63...Rb5+ 63...g6+ 64.Kg4+- 64.e5 fxe5 65.fxe5 gxh6 66.Ra7+ Kg8! avoiding a mating net; is the only move to draw 61.e5 fxe5+- 62.fxe5 Kf8 62...Ke8 63.Kg6 Ra7 63...Kf8 64.Rd8+ 64.Rb5 Rc7 65.Rb8+ Ke7 66.Kxg7 Ke6+ 67.Kg6 mate in 24 63.e6 63.Rd8+ Kf7 64.Rd7 is an elegant way to win that the Engine gives 63...Ra7 63...Re8 lasts longest now 64.h6 Kg8 65.hxg7 Kxg7 66.Rd7+ Kg8 67.Kf6 Rf8+ 68.Rf7 Ra8 69.Rg7+ Kh8 70.Rg5 Rf8+ 71.Ke7 Rf1 72.Ke8 Kh7 73.e7 Kh6 74.Rd5 Kg7 75.Kd7 Lomonosov tablebases 64.Rd8+ Ke7 65.Rd7+ Rxd7 66.exd7 Normal 1–0
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WhiteEloWBlackEloBRes
Van Kemenade,R1999Pleasants,A20881–0
May,A2004Francis,M16481–0
Gunn,T1398Miga,T18150–1
Neave,G1659Holman,S13861–0
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