Friday 23 November 2018

Update On Last Night's Game

HERE is the Central London League game from yesterday that I rather badly misevaluated during play.
Spanton (Battersea 3 - 167) - Paul Kennelly (TfL - 159)
French Defence, Burn Variation (by transposition)
1.Nc3 d5 2.d4
The tricky 2.e4 is much more popular but I do not believe it poses an aware-Black any problems.
2...Nf6 3.Bg5 e6 4.e4
By an unusual move-order, we have reached a mainline French, and PK chooses a variation popularised by Amos Burn.
4...dxe4 5.Nxe4 Be7 6.Bxf6
The mainline: White gives up the bishop-pair but has more space in the centre and a well-placed knight on e4.
6...Bxf6 7.Nf3 Nd7
Immediate castling is more common, but the text has been recommended by French Defence guru John Watson.
8.Bd3 b6 9.0-0 Bb7 10.Re1 0-0 11.c3 Be7!?
Preserving the bishop-pair at this point comes to be the analysis engine Stockfish9's first choice.
12.Qe2 c5 13.Rad1 Qc7
White has completed development while Black has no piece beyond the second rank, but who stands better?
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I was confident I was much better here thanks to dangerous kingside threats, but Stockfish9 and my other main engine Komodo9 reckon any White edge is worth less than a fifth of a pawn.
14.Bb1
Hoping to set up a battery on the b1-h7 diagonal seemed natural to me but it may be too slow. Komodo9 gives 14.Neg5 Bxg5 15.Nxg5 Nf6 with equality.
Stockfish9 gives 14.dxc5 Nxc5 15.Nxc5 Qxc5, again with equality.
14...Rfe8
This may be a novelty. 14...h6 was played in a drawn game at the 1986 Jersey Open.
The engines give 14...cxd4 15.Nxd4 Rad8 with approximate equality, although Komodo9 prefers Black.
15.Nfg5?!
Wrong knight, it seems.
The point is Black can now play 15...h6 16.Nf3 cxd4, maintaining the bishop-pair in a position that is opening up. The try 16.Nxf7?? Kxf7 17.Qh5+ wins for White after 17...g6? 18.Nd6+!, as I had seen in the game, eg 18...Bxd6 19.Qxg6+ Kf8 20.Qxh6+ Kf7 21.Bg6+ with a massive attack. However, Black has the simple 17...Kg8, when White's attack has run out of steam.
After 15.Neg5 Black cannot drive the knight away with 15...h6? as 16.Nxf7! is devastating, eg 16...Kxf7 17.Qxe6+ Kf8 18.Bg6.
15...g6!?
This looks weakening but Black can easily cover the apparently-weak dark squares.
16.h4!?
Hoping to weaken Black's king's position (I thought I was still better), but it was perhaps time to think about equalising.
The engines at first give 16.dxc5, eg 16...Nxc5 17.Nxc5 bxc5!? 18.Nf3 (18.Nxf7?! does not seem to work) Rab8, when White has no attack but Black has the bishops and queenside pressure.
But given enough time, Komodo9 comes to prefer my choice (Stockfish9 strongly disagrees).
16...cxd4
The classic central answer to a flank attack.
17.Rxd4 Rac8 18.Red1
Battersea 3's captain Howard Groves, who was watching the game quite closely as his opponent failed to show, thought this was too slow, and he may be right (the engines are not too bothered, but prefer 18.h5).
18...Red8
Wrong rook? The engines prefer 18...Rcd8 with a comfortable game for Black.
19.h5
19.Nd6 Bxd6 20.Rxd6 Nc5 seemed to give White nothing, and it doesn't, but it may have been the safest course.
Komodo9 very narrowly prefers 19.Nxe6!? fxe6 20.Nd6 Nf8 (20...Bxd6?? 21.Qxe6+ wins for White) 21.Nxc8 Bxc8 22.Rxd8 Bxd8 with an unclear position, although Stockfish9 reckons Black is better.
19...Bxe4?!
Giving up the bishop-pair makes the position dead-equal, according to the engines, who prefer a knight move, but cannot agree on which one, flitting from 19...Nc5 to 19...Nf8 to 19...Ne5, in each case evaluating the position as slightly better for Black.
20.Ne4 Nf8 21.Qf3 Rxd4 22.Rxd4 Qe5 23.hxg6 hxg6
Black is threatening to take over the initiative
24.Rd1?
Defending my back-rank weakness, but the correct way to do this was with 24.Qd1.
24...Rd8
The engines point out 24...Qb5, when White is on the back foot, but should hold on with accurate play.
The text allows ...
25.Rxd8 Bxd8 26.Qd3
… when White's difficulties are over.
(½-½, 51 moves)

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