Monday, 29 March 2021

Town and Gown

Aberystwyth were facing more familiar opposition on Thursday 25th March when we played Aberystwyth University's A team in a hard-fought match. On top board Rudy van Kemenade got an edge against Owain Davies's Vienna Game when a brief flurry of middle-game tactics left the White pawns more vulnerable. Nevertheless there was still much work to be done in a hihg-quality game before Black secured the point. Adam Watkin-Jones played cautiously against Matthew Horhey, holding back the centre pawns and fianchettoing both bishops. Nevertheless Black managed to set an unexpected trap in the opening, to win the game after only a dozen moves. Tom Gunn's Sicilian against Kieran Judge led, as so often, to a position with the players attacking each other's kings on opposite sides of the board - unusually for this opening, though, it was Black castled on the queenside and White on the kingside. When the promising White attack ground to a halt, Black was able to break through on the other wing. Sam Holman's Austrian Attack against Gabriela Griffiths's Pirc ripped open the kingside in the approved fashion, but she defended staunchly, belying her lower rating, and the game was even for a long time. Black would probably have held out for a draw but for a mistake in time trouble. The result was 3-1 to the town side.

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1.e4 e5 2.Nc3 avoiding the Petroff-Bl's known specialism 2.Nf3 Nf6 3.Nxe5 d6 4.Nf3 Nxe4 5.d4 d5 6.Bd3 Be7 7.0-0 0-0 8.Nbd2 Nf6 Davies-Pinch, Dyfed League 2020,1-0 2...Nc6 2...Nf6 a 3.f4 b 3.Bc4 Nxe4 4.Qh5 Nd6 5.Bb3 Nc6 6.Nb5 g6 7.Qf3 f5 8.Qd5 Qe7 9.Nxc7+ Kd8 10.Nxa8 b6 The Frankenstein-Dracula var, a number of Rudy's games with this are in the databases- the earliest example though is Fuller-Van Kemenade, South African Schools ch 1963,0-1 3.g3 Bc5 4.Bg2 h5 another complex line- Jane Richmond-Van Kemenade,Dyfed Open 2008,0-1 3...d5 4.fxe5 Nxe4 when Wh has 5.Nf3 or the Oxford var 5.d3 3.g3 3.f4 exf4 4.Nf3 g5 also played at elite GM level 3...Bc5 3...h5 another GM line eg 4.h3 Bc5 4...h4 5.g4 Nd4 6.d3 Bb4 Walker-Van Kemenade, Leeds League 1993,0-1 5.d3 h4 6.g4 Qf6 6...Nge7 7.Bg2 d6 8.Be3 Be6 Toczek-Van Kemenade, S Wales Autumn 2017,1-0 7.Nf3 Nd4 8.Nxd4 Bxd4 9.Qe2 c6 L Cooper-Van Kemenade, Isle of Man 2003,1-0 4.Bg2 d6 5.Na4 5.Nge2 main a6 5...Nge7 5.d3 a6 6.Nd5 Nge7 7.Be3 Bxe3 8.fxe3 h5 Pogson-Van Kemenade, Huddersfield Summer,1985, 1/2-1/2 5...Bb6 6.Nxb6 axb6 7.Ne2 Nf6 7...f5 58% for Wh 8.0-0 0-0 9.d4 Bg4 9...exd4 10.Nxd4 Bd7 11.b3 4-3-1 10.f3 Bd7 11.d5 11.Be3 1.5-0.5 11...Ne7 Bl was happy to see the centre closed, which usually favours Ns rather than Bs. The position resembles a King's Indian , except that Bl is missing the B at g7 (which can land up as a bad B.Wh, though, has no possibility of the usual Q side play typical of normal King's Indians. 12.Qd3 12.b3 Ng6 13.Bb2 Qc8 14.Rf2 Qd8 15.Nc1 Qe7 16.Nd3 Ne8 17.Qe2 f5 18.f4= Darpan-Shah,IND AICF ch blind, 2014,1-0 12.c4 Stockfish13- though here Wh does not have the early threat of c5 as in other King's Indian lines 12.g4 looked interesting to Bl, holding up f5 Bb5 13.Rf2 Bxe2 14.Qxe2 Ng6 Stockfish13 12...Ne8 12...b5 13.Bg5 c6 13...Ne8 14.Bxf6 gxf6 15.dxc6 Bxc6 16.Qd2 d5= Stockfish13 13.f4 f5 14.fxe5 dxe5 15.Bg5 Nd6 15...h6 is playable according to Stockfish13, as 16.Bxe7 Qxe7 17.exf5 Nd6 18.g4 Bb5 19.Qe3 Bxe2 19...Qh4 20.Qxe2 e4 gives Bl play on the bl squares, looks a bit suspicious to non-Engine eyes 16.Qc3 Bl had scarcely looked at this, as this seems like a non-positional square for the Q, even though she is pawn-hunting. 16.Nc3 looks natural- improving the position of the N. Interestingly that lichess analysis has not offered any comments so far, it only does so at move19 when the N does go to c3, 16...Nxd5 after looking a various options for a while, there are some lines where a q side pawn goes, but there looked to be good chances on a king side initiative if that happened 16...h6 17.Bd2 17.Bxe7 Qxe7 18.Qxc7 Rac8 18...b5 19.Qb6 Ra6 20.Qf2 Rc8-+ Stockfish13 variant 19.Qxb6 Rxc2 looked promising, & Stockfish13 gives it as winning for Bl after 20.Rf2 fxe4-+ 17...Ra4 18.Qxe5 Ng6 19.Qc3 Nxe4 20.Qe3 Re8= Stockfish13-is not one that Bl considered 16...Nxe4 17.Bxe4 fxe4 18.Rxf8+ Qxf8 19.Rf1 Qe8 20.Bxe7 Qxe7 21.Qxc7 Rc8 22.d6 Qe6 23.Qxb6 Rxc2 24.Qd8+ Qe8 25.Qxe8+ Bxe8 26.Nc3 Rxb2 27.Nxe4 just looked murky, though Stockfish13 considers = 16...Bb5 17.Qxe5 Rf7 18.exf5 just seemed to favour Wh, though Stockfish13 continues h6 19.Bf4 Nexf5 20.Qe6 Bd7 21.Qg6 Rf6 22.Qh5 Nc4 23.d6 Nfxd6 24.Qd5+ 24.Bd5+ 24...Kh8 25.Qd4= 17.Qxe5 looked best for Wh to break up Bl's centre pawns 17.exd5 Qxg5 18.Qxc7 Qe3+ Stockfish13 18...Qe7 19.Qxb6 Rac8 Bl's idea 19.Kh1 Qc5! 20.Qxc5 20.Qxd7 Rf7 21.Qe6 Re8 wins Q for R & B 20...bxc5 21.a3 b5-+ and despite equal material, Stockfish13 gives Bl as winning 22.Rfe1 17.Bxd8 Nxc3 18.Nxc3 Raxd8 though Wh has shed a pawn 17...Qxg5 18.Qxd5+ Kh8 19.Nc3 a mistake- lichess Stockfish13 first comment of the game 19.exf5 Bc6 19...Rxf5= 20.Qb3 Bxg2 21.Kxg2 Qd2 22.Qd3 Qxd3 23.cxd3 Nxf5 24.Kg1= Kg8 25.Nc3 Rad8 both Engines, though Wh will have to nurse the d3 pawn 19...Qe3+ 20.Kh1 labelled inaccuracy by lichess 20.Rf2 is a little bit better, but is is very difficult working out why fxe4 21.Qd2 Qxf2+ 22.Qxf2 Rxf2 23.Kxf2 Bc6-+ Stockfish13 20...Bc6 lichess analysis calls this a blunder (apparently the only inaccuracy by Bl in the game) 20...fxe4 would be winning it seems- recapturing the pawn for Wh is not as straight forward as one would expect, mainly because of the delayed ...Bc6 move 21.Qd3 Qxd3 21...Qc5 22.exf5 Nxf5 preferred by Stockfish13, but is just level- with the text Wh is left with an isolated pawn that obstructs his B 22.cxd3 fxe4 23.dxe4 Kg8 24.b3 4th choice Stockfish13, still =. However Bl thought this weakened the a pawn, and put another pawn on a wh square, considering 24.a3= as better 24.Kg1 improving the K position like Bl did first choice Stockfish13 24...Rae8 25.Rxf8+ Kxf8 26.Re1 26.Kg1 Stockfish13 Ke7 27.Kf2 b5 28.Rc1 Nf7 29.Ke3 b4 30.Ne2 Nd6 31.g4 Kf6 31...Kd7 32.Ng3 Nb5 33.Rc2 Nc3 34.g5 Kd6 35.Nf5+ Ke5 36.Nxg7 Rg8 37.Nf5 Rxg5 38.Nd4 Rg6= 32.Ng3= = does not mean draw here, rather that both sides have chances as there is still quite a bit of play left 26...b5 seeing if Wh will play a3, when the R has a target- after Ra8, Ra1 b4 comes 26...Re5 27.b4 Nb5 28.Nxb5 Bxb5 29.Kg1 Re8 30.Rc1 c6 31.Rd1 Ke7 Stockfish13 27.Rf1+ Nf7 27...Ke7 Bl's first idea is a little better 28.e5 Nf7 29.Bxc6 bxc6 30.a4 bxa4 31.Nxa4 31.bxa4 Ra8 31...Nxe5 32.Re1 Ke6 Stockfish13 28.b4 labelled an inaccuracy by lichess 28.Nd5 Bxd5 is what Rudy would have played, and given by Stockfish13 here 28...Ra8 29.e5 Re8 30.Nxc7 Rxe5 31.Bxc6 bxc6 32.Rc1 Nd8 33.a4 bxa4 34.bxa4 Ke7= lichess Stockfish13-though the Bl K is still far better than its rival and could tip the edge on the Q side-Wh needs the defensive precision that Engines take for granted 35.Na6 Ra5 36.Nb4 Kd6 37.Rd1+ Kc5 37...Kc7? 38.Rxd8 Rxa4 39.Rd4 c5 40.Nd5++- 38.Nd3+ 38.Rxd8 Kxb4 38...Kc4 39.Nf4 Ra8 40.Kg2 g5 41.Nd3 c5 42.Kf3 Nc6 43.Kg4 Nb4 44.Ne5+ Kb3 45.Kxg5 Rxa4= Wh's simplest course here is to give up the N for the c pawn , leaving Bl with R & N vs R 29.exd5 Re7 29...Ke7 Rudy 30.Re1+ Kd8 31.Rxe8+ Kxe8 32.Be4 h6 with hopes that d5 stil obstructs the B & needs defending, eg 33.Kg2 Ke7 34.Kf3 Kf6 34...Kd6 35.Kf4 Kc5 is far from clear- the Engine sarts playing fancy moves 36.Bg6 Nh8 37.Be8 Kxd5 37...b4 38.Ke5+- 38.Bxb5 Ng6+ 39.Ke3 Ke5 40.Be2= and with d5 exchanged the B is now a little better than the N, but Bl has a better K position 35.Kf4 b4 36.Bd3 Nd6 37.Bc4 g5+ 38.Kg4 Ne4 39.Kh5 Nc3 39...Kg7 40.Kg4 Kf6 41.Kh5 40.Kxh6 Nxa2 41.h4 gxh4 42.gxh4 Nc1 43.Kh5 Kf5 44.d6 cxd6 45.Kh6 Kf6 46.Kh5 b5 47.Bg8 Kg7 48.Bd5 Kf6 49.Bg8= Stockfish13 28...Rd8 28...Ra8 Stockfish13, considered by Bl 29.e5 Ke7 30.Nd5+ Bxd5 31.Bxd5 Nxe5 32.Bxb7 Rxa2 33.Rc1 Rb2 34.Rxc7+ Kf6 35.Bd5 Rxb4 Stockfish13 28...Ke7 Stockfish13 29.Kg1 Rd8 30.Rd1 Rxd1+ 31.Nxd1 Nd6 32.Nc3 Kf6 33.Kf2 Ke5 34.Ke3 considered, Be8 35.Nd1 Bf7 36.Nf2 Nc4+ 36...Bxa2 37.Nd3+ Ke6 38.Nc5+ Kf6 39.Kd4 Wh's active K compensates 28...Bd7 29.Kg1 g6 Stockfish13- keeps all the tension 29.Nd5 Bxd5 29...Ra8 30.e5 Re8 transposes to a line covered in analysis above 30.exd5 Ke7 31.h4? given the match situation Wh was actually trying to win, but this gives Bl the kind of central blockade he was after 31.Re1+ Kd6 31...Kd7 32.Bh3+ Kd6 33.Re6+ Kxd5 is what Bl had in mind 34.Re7 Ne5 35.Rxc7 35.Rxg7 c6 36.Rxb7 Kc4 37.Re7 Rd1+ 38.Kg2 Rd2+ 39.Kf1 Rxh2 40.Bf5 Kd4 41.Bxh7 Rxa2= but unbalanced, which is what Bl was after 35...Ke4 36.Bg2+ Ke3 37.Bxb7 Rd1+ 38.Kg2 Rd2+ 39.Kg1 and Bl has nothing better than to accept the perpetual 39.Kh3 nearly gets mated, but Wh escapes g5 40.Rc3+ Kd4 41.Rc5 g4+ 41...h5 42.Rd5++- 42.Kh4 Rxh2+ 43.Kg5 h6+ 44.Kf5 44.Kf6? Nd7+-+ 44...Nd3 45.Rd5+ 45.Rxb5? Rh5+ 45...Kc4 46.a3 Ra2 47.Ke4 Re2+ 48.Kf5 Ra2 repetition, Stockfish13 32.Bf1 is the line given by both Engines Ne5 33.Bxb5 Ra8 33...Rf8 34.Kg2 Ra8 is lichess, wasting a tempo, just to bring the Wh K one square nearer?! 34.a4 Kxd5 35.Rd1+ Ke4 35...Ke6 36.Re1 c6 is a more human attempt at winning 37.Bc4+ Kd6 38.Bb3 h6 39.Rd1+ Kc7 40.Re1 Nd3!? 40...Re8= 41.a5 Re7 42.Kg2 Kd6 43.Rd1+ 41.Re7+ Kb6 42.Rxg7 Rf8 43.Rg6 Rf1+ 44.Kg2 Rf2+ 45.Kg1 45.Kh3 Ne5 46.Rxh6 Nf3 47.Kg4 Nxh2+ 48.Kh5 Rf3 49.Bd1 Rxg3 50.Rf6= Wh's K is cut off, but so is Bl's N 45...Rb2 46.Be6 h5 47.h4 Rxb4 48.Rh6 Rxa4 49.Rxh5= Stockfish13-though here the B is better than the N 36.Re1+ Kd4 37.Rd1+ and now Bl must repeat, as the attempt at winning is too dangerous with the liberated B Kc3? 38.Rc1+ Kxb4 39.Rxc7 Rg8 40.Rxb7+- Stockfish13 31...Ne5 32.Rc1 lichess labels this a mistake, & it makes life easier for Bl. However , its alternative of 32.d6+ fails to secure equality- no followup is given by lichess, but it was what Bl expected as it liberates the B Kxd6 32...Rxd6 33.Re1 Ke6 34.Bxb7 Rd4 35.Be4 Rxb4 36.Bxh7 c5 retains an edge for Bl- the 3 Bl pieces work together far better than Whs 33.Rd1+ 33.Bxb7 c6-+ traps the B 33...Ke7 34.Re1 Kf6 35.Rf1+ 35.Bxb7 Rd4 36.a3 Rd3 37.Kg2 Rxa3 38.Rc1 Rb3 39.Rxc7 Rxb4 40.Bd5= Stockish13- but in practical play Bl would have good winning chances with the extra pawn. 32...Kd6-+ from now on lichess claims four further inaccuracies by Wh, but te Wh K is still a long way off & Wh was also beginning to live on increments( Bl was down to 15 mins) 33.Kg1 Ra8 34.Rc2 Ra4 35.Be4 lichess inaccurate 35.Rb2 but Bl would have been content with Nc4 36.Rf2 Rxb4 37.Rf7 Rb1+ 38.Kh2 Rb2 39.Kh3 Rxa2-+ Stockfish13- Bl pawns travel faster 40.Be4 Ne5 41.Rxg7 h5 42.Rg5 Ng4 threatens mate 43.Bg2 b4 the d5 pawn remains in Wh's way 35...h6 36.Kg2 36.Rb2 again insisted upon by lichess Nc4-+ 36...Rxb4 37.Bf5 Rc4 37...Rd4 38.Be6 c5 Stockfish13 38.Rb2 b4 39.Bc2 Rd4 40.Bb3 c5 40...Nd3 41.Re2 Nc5 Stockfish13 alternative 41.dxc6 bxc6 42.Rf2 c5 43.Rf8 43.Rf4 insisted upon by lichess, but just looks like surrender to non-Engine eyes Rxf4 44.gxf4 Nc6 45.Bf7 Na5 46.Kf2 c4 and Bl will win a B, or, at the very least win both Wh's K side pawns 43...c4 44.Rd8+ Kc5 45.Rc8+ Kd5 46.Ba4 and , finally, lichess calls this inaccurate as it insists that Wh must play .. .... 46.Kh3 46...Rd2+ 47.Kh3 Rxa2 48.Rd8+ Ke4 49.Bb5 b3 49...h5 threatening a mate was considered, but pushing the pawns looked simplest 50.Rd1 c3 a very complex game, against very stiff Wh resistence, with a drawn outcome possible at various points. 0–1
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WhiteEloWBlackEloBRes
Davies,O1762Van Kemenade,R19990–1
Watkin-Jones,A1918Horhey,M15500–1
Judge,K1217Gunn,T13980–1
Holman,S1386Griffiths,G10001–0

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