Sunday, 23 September 2018

Decent Draw

DREW against a Chinese junior in round two of the Highlands Open in Trebic, Czech Rep.
It was a good result, but arguably was at least partly due to my good luck from yesterday's game carrying over to today.
Position after 26...Ne2-c3 in Ruotong Chu (2199) - Spanton (1923)
White's extra pawn and the bishop-pair give her a comfortable advantage even though White's pieces are not well-coordinated.
27.a3?
Chu had won the congress's speed-chess tournament (10mins + 5secs a move) earlier in the day, but here she misses a tactical shot based on the restricted number of squares available to White's king.
27...Bxa3
White is still better, according to Stockfish9 and Komodo9, but Black's drawing chances have hugely increased.
28.Bb6 Re2 29.e6!? fxe6 30.Bh3
This takes away Black's mating threat, so now the a3 bishop is really hanging.
30...Rd1+ 31.Rxd1 Nxd1 32.Bxe6+ Kf8 33.Bd4 Bb2 34.Bc5+ Ke8 35.Bf5 h6 36.Bc3 Nd3 37.Bd4 Kf7 38.Bxb5 Nxb5 39.Bxb2
Black to play and save the game
The engines reckon White has the upper hand, ie plus-over-minus. But in reality this ending should be drawn with reasonable care by Black.
39...h5
Gaining space, but more importantly starting to get Black's pawns off the same-coloured squares as the White bishop.
40.Ke2 g6 41.Ke3 Ke6 42.Kf4 Nd6 43.Kg5 Kg7
The Black king will defend the pawns while the knight harasses White's king and pawns.
44.f4 Ne4+ 45.Kh6 Nd6 46.Kg5 Ne4+ 47.Kh6 Nd6 48.Be5 Nf5+ 49.Kg5 Ne3 50.h3 Nf5 51.h4 hxg4 52.hxg4 Ng3
And now the knight waits to sac itself as soon as the f pawn advances.
White can lose a tempo with her bishop, but even if the knight cannot cover f5, White will have no winning chances once a pair of pawns is exchanged.
RC played on for another 34 moves, but eventually conceded the half-point.

No comments:

Post a Comment