Sunday, 15 March 2020

Coronavirus

Due to the current coronavirus pandemic, Aberystwyth Chess Club is closed for the rest of the season. The Dyfed League has also been suspended, so there will be no more matches.
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Sunday, 8 March 2020

Hubris

In last week's post I remarked that it has been the draws that have done the damage to Aberystwyth's chances in this season's Dyfed League. Before the away match against Cardigan A at the Emlyn Cafe, Tanygroes on Monday 2 March, we had only lost one match, to Cardigan B, and the draw we managed against the A team in the previous fixture had in fact been a creditable result. But any mood of complacency was quickly dissipated in the return match. On top board, Rudy van Kemenade seemed to have secured a comfortable middlegame with his Bird's Opening but Howard Williams invaded on the white squares of the queenside and centre, winning the exchange and a pawn. It looked as if Rudy could still hold out in the complex game that followed, but a tactical blow finished him off. Julie van Kemenade's game against Iolo Jones was another invasion, as her queenside castled position in a Philidor proved full of holes, though her resignation two pawns down was perhaps a bit premature. A miscalculation cost me a pawn in an exchange French against Tony Haigh after which I was always struggling against his superior endgame technique. Amazingly, though, a possible win suddenly turned up for me; it was not difficult to see, but at that stage I had become so accustomed to the fact that I was losing that I didn't stop to think, and missed my chance. Tom Gunn got an asymmetrical but level position with rook and pawn for two pieces in a Queen's Pawn Game against Ben Brewer. It looked drawish till he got his rook trapped and lost the exchange, leaving him a piece down, after which defeat soon followed. A 4-0 win to Cardigan A.

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1.f4 c5 2.Nf3 Nc6 3.g3 g6 4.Bg2 Bg7 5.c4 5.0-0 5.d3 5...Nf6 5...e6 6.Nc3 d5 6...0-0 6...d6 7.cxd5 7.Ne5 Nxe5 8.fxe5 Ng4 Bondar-Sanakoev, RUS ch Seniors Odintsovo 2008, draw agreed 9.Nxd5= 7...Nxd5 8.Ne5N 8.0-0 main, 2 Wh wins, 4 draws, 5 Bl wins 8.Nxd5 Qxd5 9.0-0 0.5-1.5 8...Nxe5 9.Bxd5 9.fxe5 Nxc3 10.bxc3 Bxe5 10...Qa5 11.0-0 0-0 Stockfish11 11.Qa4+ Bd7 12.Qe4 Qc7 13.Qxb7 Qxb7 14.Bxb7 Rb8 15.Bf3 0-0 16.Kf2 Be6 17.Ba3 Rfc8 18.Rhb1= Stockfish11 9.Nxd5 Nc6 10.d3 Be6 11.Nc3 0-0 Stockfish11 9...Nc6 10.Bg2 10.Bxc6+ bxc6 11.0-0 didn't look like a good idea-ceding 2 Bs & a weakened K structure Bh3 11...h5 12.h4 0-0-+ Stockfish11 12.Rf2 h5 10...0-0 11.0-0 Be6 12.b3 12.d3 12...Rc8 12...Qd4+ 13.e3 Qd7 14.Bb2 Rac8 Stockfish11 13.Bb2 Qd7 13...c4 Stockfish11 14.Qc1 14.d3 h5 15.Qd2 h4 16.gxh4 16.Ne4 h3 17.Bh1 b6 18.Nf2 Bxb2 19.Qxb2 Rfd8= 16...Bh3 17.Rf2 Qg4 18.Raf1= Stockfish11 14...b6 15.Ne4 15.d3 15...Nd4 16.Re1 c4 17.b4 Bg4 18.Kf1 18.Kf2 had to be tried, but Wh wanted the N on this square Rfd8 19.Bc3 19.e3 f5-+ 20.Ng5 20.Bxd4 Bxd4 21.exd4 fxe4 22.Rxe4 Bf5 23.Re3 Qxd4-+ 20.h3 Nf3 21.Bxg7 fxe4 22.hxg4 Nxe1 23.Kxe1 Kxg7-+ 20...Nc2!-+ Stockfish11 18...Nxe2 19.Rxe2 Qd3 20.Nc3 Bxc3 21.Qxc3 Bxe2+ 21...Qxe2+ 22.Kg1 f6 Stockfish11-looks better , keeping Qs as Wh's K could still be vulnerable 22.Kf2 Qxc3 23.Bxc3 Wh is now hoping for a bl square barricade, that almost comes off Bg4 24.Re1 24.a4 24...Rfe8 25.Re5 f6 26.Re3 Bd7 27.Bb7 Rc7 28.Bd5+ e6 28...Kg7!? 29.Bf3 Kf7 30.Be2 30.g4!? 30...b5 Wh needs to take care not to lose the a pawn now 31.Bd4 Bc6 32.g4 32.Ra3 Rd8 33.Ke3 Rcd7 34.Bc3 h6 35.Ra6 Rc7 36.Bd4 Rb8 37.Bc5 Ra8 38.a4 Bb7 39.Ra5 a6 40.axb5 otherwise Wh's R is stuck axb5 41.Rxb5 Ra3+ 42.Kf2 Ra2 43.Bxc4 Rxd2+ 44.Ke3 Rxh2-+ and Bl's Rs have open lines 32...Rd7 33.Bc3 e5 looks ok at first , but it does allow Wh to close things up in various ways ( though Wh was angling to get in g5 with control over e5 34.fxe5 fxe5 35.Ke1 35.g5 35.a4 are Stockfish suggestions that were considered 35...e4 does nothing much for Bl's remaining B, & gives Wh a free run on the bl squares 35...g5 36.Bxe5 h6-+ is Stockfish11 36.a4 opportunistic a6 36...bxa4 should probably be tried- a passed pawn is useful , even necessary , when an exchange up. 37.Bxc4+ Ke7 37...Bd5? 38.Bb5 gives Wh recovery chances 38.Be5 Kf8 39.Bf4 Rd4 40.Rc3 e3 41.Bxe3 Rdd8 41...Rxg4 42.Be2= 42.Kd1 Bd5 43.Bxd5 Rxd5 44.Bh6+ Kf7 45.Be3 a5 46.bxa5 Rxa5 47.Bc5 Rc8 48.d4 Ke6-+ Stockfish11 nudged 37.axb5 Stockfish11- Wh was unsure of this; the idea is to weaken b5, lure the Bl Rs onto the a file then use the Wh R to break in via the K side. However 37.a5 closes up the Q side,but then Bl can react on the K side- another consideration that lead Wh to the exchange g5 and Bl gets the f file 37.g5 bxa4 38.Bxc4+ Bd5 39.Bxa6 39.Bb5 is no longer an option 39...Ra8 40.Be2 a3 and the a pawn will win 37...axb5 38.g5 Ra7 38...Rd5 39.Rg3 Rf5-+ Stockfish11 39.Rh3 39.h4 Ke6 40.Rh3 e3 41.Rxe3+ Kf5 42.Rxe8 Bxe8 43.Kf2 Kf4-+ Stockfish11 39...Kg8 40.Kf2 Bd7 40...Rf7+ 41.Bf6 41.Ke3 Rf3+ 42.Bxf3 exf3+ 43.Kf2 Re2+ 44.Kf1 Be4-+ Stockfish11 41...Ra8 42.Ke1 h5 43.Re3 Ra4 44.Bc3 Rf5-+ Stockfish11 41.Rg3 Bf5 41...e3+ anticipated by Wh 42.Rxe3 Rxe3 43.Kxe3 Kf7 returns a pawn to liberate the B 42.Ke3 Ra2 43.h4 Rd8 44.Rg1 Kf7 45.Rf1 Ke6 46.Rh1 (draw?) 46.h5 gxh5 47.Bxh5 Rd3+ 48.Kf4 Ra7 48...Rdxd2 49.Bxd2 Rxd2 50.Be8 Rb2 51.Bxb5 Rxb4 52.Ba6 Bg6-+ with 2 pawns up, is enough for a human, even if Engines don't rate it as high as keeping the exchange. 49.Rh1 Rd8 50.Rh2 Rad7 51.Be2 Rf7 52.Ke3 Rd5 the problem is that Stockfish11 seems to be involved in high-level obscure moves, seeking to maximise slowly & keep advantage going, without seemingly getting anywhere. 46...Kd5 47.Rf1 Ke6 well at least the same position twice 48.Rh1 Rda8 49.Rf1 Wh had seen the possibility of a R getting to c2, & could have tried preventing it 49.Rc1 pm analysis R8a3 50.h5 Kd5 51.hxg6 hxg6 52.Bf1 but Bl then comes in the other side Ra7 52...Rb2 53.Ke2 Rxc3 54.Rxc3 Rxb4 looks even simpler, though not high in Stockfish11 options 53.Bg2 Rh7 54.Rg1 Rh2 55.Bf1 Ra7 56.Bg2 Rah7 57.Bf1 R7h4 58.Bf6 Bh3 59.Be2 Bg2 60.Bc3 R4h3+ 61.Kf4 Bh1 62.Bd1 Rf2+ 63.Kg4 Rhh2 Stockfish11 49.h5 part of Wh's original idea when exchanging on b5 had to be played now gxh5 50.Rxh5 Rc2 51.Rh6+ Bg6 52.Bh5 Kf5 53.Bxg6+ hxg6 54.Rh7 Rd8 55.Rf7+ Kg4 so far pm analysis, mirrored by Stockfish11 56.Rf1 56.Rb7 pm analysis Rc1 56...Rd3+ 57.Kxe4 Rc1 58.Ke5 58.Rxb5 Re1# 58...Kxg5 59.Ke6 Re1+ 60.Kf7 Rd5-+ Stockfish11 57.Bd4 Re1+ 58.Kf2 Rh1 59.Be3 Rf8+ 60.Ke2 c3! 61.dxc3 Rh2+ 62.Ke1 Kf3 63.Bd4 e3-+ Stockfish11 56...Rd3+ 57.Kxe4 Ra2 58.Rf4+ Kg3 58...Kxg5? 59.Bf6+ Kh6 60.Rh4# 59.Rf6 Ra8 60.Rxg6 Re8+ 61.Be5+ Kg4 62.Rb6 Rxd2 63.Rxb5 Red8 63...c3-+ also, somewhat like this reached in pm analysis 64.Bf4 Re2+ 65.Be3 Rd3-+ Stockfish11 49...Rc2 50.Rh1 50.Re1 Kd5 51.h5 Raa2 52.Rd1 Ra3 53.Kf4 Rb3 54.Re1 Rcb2 55.Bxb2 Rxb2 56.hxg6 hxg6 57.Ke3 Rxb4-+ Stockfish11 50...Ra3 51.h5 gxh5 51...Raxc3+ Stockfish11 ignores the K side diversion 52.dxc3 Ke5 52...Rxc3+ 53.Kd4 Rb3 54.Kc5 Rb2 55.hxg6 hxg6 56.Re1 Rd2 57.Kxb5 c3-+ but Wh can spin things out for a bit 53.Kf2 Rxc3 and b4 falls as well. 53...gxh5 52.Rxh5 Raxc3+ and Wh resigned because disaster strikes for a second time on e2 52...Raxc3+ 53.dxc3 Rxe2+ 53...Ke5 Stockfish11 thinks it has an even stronger idea 54.Rh4 Rxc3+ 55.Kf2 Rb3 56.Rh1 Rxb4 getting 2 distant pawns, 54.Kxe2 Bg4+ but this line it comes to recognize as best 0–1
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WhiteEloWBlackEloBRes
Van Kemenade,R1943Williams,A23330–1
Jones,I2210Van Kemenade,J16911–0
Francis,M1689Haigh,A17970–1
Brewer,B1641Gunn,T14221–0
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