Friday 28 February 2020

Long-Term Dragon Sac

PLAYED on board three (of 10) for Battersea 2 away to Cavendish 2 in division two of the London League last night.
Spanton (170) - Daniel Wright (187)
Sicilian Accelerated Dragon
1.e4 c5 2.Nc3 g6 3.Nf3 Bg7 4.d4 cxd4 5.Nxd4 Nc6 6.Nxc6!?
The normal move is 6.Be3.
6...bxc6 7.Bc4 d6 8.0-0
8.Qf3!? Nf6 9.e5 dxe5 10.Qxc6+ Bd7 is unclear.
8...Nf6 9.e5!? dxe5 10.Qxd8+ Kxd8 11.Re1
Not 11.Bxf7?? e6.
11...e6 12.Bg5 Kc7 13.Rad1 h6 14.Bh4
Stockfish10 and Komodo10 prefer 14.Bd2.
14...Nd5 15.Na4
15.Ne4?? loses a piece after 15...f5.
15...Nb6 16.Bb3 Nxa4 17.Bxa4 f6 18.Re3 Bb7
Stockfish10's choice. Komodo10 gives 18...g5 19.Bxc6!? Rb8 (if 19...Kxc6, then 20.Rc3+, when the black king cannot escape checks from the white king's rook) 20.Rc3 Rxb2 21.f3!? Kb8 22.Bf2 with compensation for a pawn.
19.f4 g5?
Apparently missing one of the points behind 19.f4, but White also has good compensation for a pawn after 19...exf4 20.Rxe6 Rhe8 21.Rde1 Rxe6 22.Rxe6 Kd7 23.Bb3, according to the engines.
20.fxg5
Better it seems is the engines' 20.Be1! as after 20...a5 21.Red3 Bc8 White can give Black doubled isolanis with 22.fxe5 fxe5.
20...hxg5 21.Be1 a5 22.Red3 Bc8 23.Rc3
Cavendish's Daire McMahon later suggested 23.Rd6 Ra6 24.R1d3?
I believe I was worried about 24...Bf8, when 25.Bxa5+ (only move) Rxa5 26.Rxc6+ Kb8 27.Rd8 Bc5+ 28.Rxc5 Rxd8 29.Rxa5 Bb7 slightly favours Black, according to the engines, despite White being a pawn up. The point seems to be that White's pieces are a little uncoordinated.
However, the engines give 24...e4 25.Bxa5+ Rxa5 26.Rxc6+ Kb8 27.Rb3+ Ka8 with a winning advantage for Black. If 25.Rd1, then f5 with a large advantage for Black, eg 26.c3 Be5 27.R6d2 Bxh2+.
23...Bb7 24.Rc5 Kb6 25.Bf2 Kc7 26.Be1 Kb6
With hindsight, Black should give back the pawn with 26...Bf8 27.Rxa5, when Komodo10 reckons the position is equal but Stockfish10 slightly prefers Black.
White to play and win
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27.Rd7!!
This wins in all lines.
27...Bf8
If 27...Kxc5, then 28.Bf2+ Kb4 (or 28...Kc4 29.Bb3+ Kb5 30.a4+ Ka6 31.Bc4#) 29.Rxb7+ Kxa4 (if 29...Kc4, then 30.Bb3# ) 30.Bc5, and mate follows.
Or 27...Rhd8 28.Bf2! (28.Rxg7 Kxc5 29.Rxb7 is also strong) Ka6 (28...Rxd7? 29.Rxc6#), eg 29.Bxc6 Rxd7 30.Bxd7 Bf8 31.Rc7 Rd8 32.a4.
28.Rc3 Bc5+
If 28...Bb4, then 29.Bf2+ Ka6 30.Bxc6! Bxc3 31.Bxb7+ Kb5 32.Bxa8.
29.Rxc5! Kxc5 30.Bf2+ Kb4 31.Rxb7+ Kxa4
31...Kc4 32.Bb3#.
32.Bc5 1-0
Cavendish 2 won the match 8-2.
My updated Battersea statistics for 2019-20
Event*..Colour...Grade...Opponent's Grade...Result
CLL..…...B....…..168...………169...……….....W
CLL...…..B...…...168...………196...…………..D
CLL...…..W...…..168...………176...…………..L
LL....……W...…..168...…....…175...………….D
CLL...…..B...…...168...………192...…………..D
CLL...…..W...…..168...………181...…………..L
LL...…….W...…..168...………168...…………..L
EC...…….B...…..168...………175...……….….L
CLL...…...B.........170...………172...…………..L
LL...…….W...…..170...………183...…………..D
LL............W........170...…........180......……......L
LL....…….B...…..170....……...182...………….W
CLL...…...B...…..170...………183...……….….D
LL...……..B...…..170...………162...…………..W
LL...…….W...…..170...………172...…………..W
LL...…….W...…..170...………152...…………..L
CLL...…...B.........170..............194...................L
LL...…….W...…..170...….…...187...………….W
Overall this season for Battersea I have scored +5=5-8 for a grading performance of 169.
In season 2018-19 I scored +12=12-13 for a grading performance of 169.
In season 2017-18 I scored +10=8-9 for a grading performance of 175.
*CLL: Central London League; LL: London League; EC: Eastman Cup.

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