Saturday, 12 December 2020

Falling at the Last Fence

A point ahead of our nearest rivals going into the last round of the U1800 section of the Welsh Chess Union Online League on Tuesday 8th December, Aberystwyth failed to clinch the title. My Rossolimo attack against Owain Davies's Sicilian followed a standard pattern for the first few moves, but I wasn't sure of the correct way to play against his formation, and became concerned that my intended f4 break would liberate his fianchettoed bishop on g7. Since I didn't have any other plan, I was then compelled to wait around while he attacked on the f file instead, after which my position collapsed quickly. Julie van Kemenade suffered a similar fate against Cameron Westwood's English Opening, a blocked position which suddenly expoded into a decisive kingside attack for White. Tom Gunn lost a pawn in the opening against Matthew Horhey in an irregular Queen's Pawn game; the resulting position was very open, and Tom came off worse in the tactical exchanges that followed. Finally, Sam Holman invited complications by playing the Najdorf Sicilian against Toby Bates, and was doing well for some time, but White finally managed to get his kingside attack going to force the win. A 4-0 defeat means that Aber finished fourth in the section, a good result which could have been so much better. First place went to North Cardiff Panthers, with Aberystwyth University second and Steynton A third.

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1.e4 c5 2.Nf3 Nc6 3.Bb5 3.d4 cxd4 4.Nxd4 Nf6 5.Nc3 e5 Cooke-Davies,Rd5 WCU online U1800,0-1 - R [others from centipawn analysis-R] 3...g6 4.Bxc6 4.0-0 main Bg7 5.Re1 Nf6 6.c3 0-0 7.d4 d5 8.exd5 Qxd5 9.c4 Qd6 10.d5 Nd4 11.Nxd4 cxd4 12.Bg5 Francis-Miles, Dyfed Open 2020,0-1 -R 4...dxc6 Stockfish 12: 5.d3 Bg7 6.h3 Qc7 6...Nf6 main-R 7.Nc3 Inaccurate [ main move, as played eg by Muzychuk sisters & a top choice of Stockfish12 -R] e5 8.Be3 OK b6 9.0-0 OK 9.Qd2 main-R 9...Ne7 OK [Stockfish12-R] 9...Nf6 main, as played in Magsoodloo- Grandelius, Sigeman & Co, Malmo 2019,1/2-1/2 a more flexible square from where it can go to d7. Note , it stays on e7 for quite some time in the game-R 10.Nd2 looks fine, Wh is prepared to bring up a pawn alongside his most advanced e4 one and opening up the f file 10.Qd2 main,3 Wh wins, 2 draws, 1 Bl win-R 10.a3 Cloud Engines, 1 game each 10...Be6 OK 11.Qe2 Inaccurate 11.f4= just has to be played here-R 11...0-0 OK 12.Nc4 Mistake (0.9) 12.a4= 12.f4= Rudy & Stockfish12-R 12...f5 Best 13.b3?
Loses game (2.0) [ Wh cannot allow Bl to get in ..f3-R 13.f3 13...f4!-+ Strong 14.Bc1 OK f3 OK 15.Qe3 Inaccurate 15.gxf3 is better for Wh than what happened, though both Stockfish12 & Komodo10 then delay the oimmediare capture on h3, with ...Rf7-R 15...Qd7 OK [the lichess analysis insists this is an inaccuracy, giving ..h6, Nd2, fxg2 instead -Yet Stockfish12 thinks it's okR 16.Qg5 [best move here Stockfish12- a mistake according to lichess anaysis. fxg2 OK 17.Re1 Rae8 given as inaccurate by lichess, which gives ...b5 as best- supported by Komodo10 & Stockfish12 18.Qxg2 Inaccurate [but lichess thinks it fine, no comment-R Bxh3 19.Qg3 Qe6? Mistake (3.0) [Blunder- lichess, insisting on ...b5-R] 19...Rf4 20.Kh2? Mistake (3.0) 20.Re3 20.f3 Komodo10& Stockfish12-R 20...Bg4-+ Best 21.Rg1 Bh5 Inaccurate[labelled blunder by lichess, all 3 Engines prefer h5, but Wh is in terrible trouble anyway-R 22.Nd2 Mistake (1.5) 22.Bg5 22.Be3 preferred by Stockfish12-R 22...Rf7 23.Bb2 23.Rg2 23...Bh6-+ 24.Nc4 24.Qh4 Bxd2 25.Qxh5 Rxf2+ Stockfish12- doesn't save Wh either-R 24...Bf4 Strong: Black=1 Best: Black=2 OK: White=3, Black=6 Inaccurate: White=4, Black=1 Mistake: White=3, Black=1 Loses game: White=1. Weighted Error Value: White=0.99/Black=0.31 Centipawn loss: w=100/b=40
0–1
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WhiteEloWBlackEloBRes
Francis,M1648Davies,O17620–1
Westwood,C1675Van Kemenade,J16411–0
Gunn,T1389Horhey,M17500–1
Bates,T1366Holman13861–0

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