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Michael A Lamon vs Sunil Weeramantry
91st US Open (1990), Jacksonville, FL USA, Aug-??
Modern Defense: Standard Defense (B06)  ·  0-1

ANALYSIS [x]

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Kibitzer's Corner
Mar-31-08  SBGiffy: In his 'Best lessons...' book Weeramantry really criticizes 15. b3, and probably rightly so, but I don't think it should lose outright as long as white plays (the grovelling) 16. Na2 (which isn't discussed unfortunately). This would of preserved the dark squared bishop and prevented the subsequent dark square invasion. Black is probably better but white is still fighting, with moves like Qa5 possible. But 16. Rac1 really is losing.
Aug-07-08  Bodhidharma: Weeramantry said that b3 weakens the a1-h8 diagonal against Black's bishop on g7. He figures that White moved it to prevent Black's Knight from approaching a4 or c4, thereby giving up "long term interests for short-term gain". But with the White Bishop still on diagonal and the Black Bishop being a Knight screen, I don't see why the move deserve such critique. Especially when at the end the winning attack didn't even eventuate along that diagonal. As they say "A weakness is not a weakness if the opponent cannot exploit it"
Nov-14-09  RandomVisitor: 3 minutes per move:

M Lamon - Sunil Weeramantry
[B06]

Jacksonville 1990 Jacksonville, FL, 1990

[Rybka 3 ]

1.e4 d6 2.d4 g6 3.Nc3 Bg7 4.Be2 c6 5.Nf3 b5 6.a3 a6 7.0-0 0.37/20 Nd7 0.62/18
[Rybka 3 : 7...Nf6 8.e5 Nd5 9.Nxd5 cxd5 10.Bf4 0-0 11.exd6 exd6 12.Re1 Nc6 13.c3 Be6 14.h3 Re8 15.a4 b4 16.Qb3 bxc3 17.bxc3 Bf8 18.Ng5 0.37/20 ]

8.h3= 0.20/20
[Rybka 3 : 8.Bf4 Ngf6 9.h3 Nb6 10.Qd2 Be6 11.Bh6 0-0 12.Bxg7 Kxg7 13.e5 Nfd5 14.Ne4 f5 15.Neg5 Bg8 16.Nh4 0.62/18 ]

8...Qc7 0.41/17
[Rybka 3 : 8...Bb7 9.Be3 Qc7 10.b4 Ngf6 11.a4 0-0 12.Qb1 Nb6= 0.20/20 ]

9.Be3= 0.20/20
[Rybka 3 : 9.Qd3 Ngf6 10.Bf4 0-0 11.e5 dxe5 12.Nxe5 Nxe5 13.Bxe5 Qb6 14.Rfe1 Bf5 15.Qd2 0.41/17 ]

9...Ngf6 0.38/19
[Rybka 3 : 9...Bb7 10.b4 Ngf6 11.a4 Rc8 12.Qb1 h6 13.Re1 0-0 14.Bd3 Rfe8 15.Qc1 g5 16.Qb2 Red8 17.Qb3= 0.20/20 ]

10.Qd2= -0.01/18
[Rybka 3 : 10.Bf4 0-0 11.e5 Nh5 12.Bh2 dxe5 13.Re1 Rd8 14.dxe5 Nxe5 15.Qc1 0.38/19 ]

10...0-0 0.13/16 11.Rfd1= -0.19/19
[Rybka 3 : 11.Rfe1 c5 12.d5 Bb7 13.Rad1 Rab8 14.Bd3 c4 15.Bf1 Nc5 16.Bf4 Nfd7 17.Bh6 Ne5 18.Nxe5= 0.13/16 ]

11...Bb7 last book move

[Rybka 3 : 11...c5 12.Ne1 Bb7 13.d5 Rfe8 14.Rab1 Nb6= -0.19/19 ]

12.Ne1 -0.31/18 c5= -0.19/18
[Rybka 3 : 12...Rad8 13.Nd3 c5 14.d5 Nb6 15.Bh6 e6 16.Bxg7 Kxg7 17.Nf4 e5 18.Nd3 c4 19.Ne1 Nfd7 20.Nf3 Nc5 21.Qe3 -0.31/18 ]

13.f3 -0.41/19
[Rybka 3 : 13.d5 Rfe8 14.Rab1 Nb6 15.b3 e6 16.dxe6 Rxe6 17.Bf3 Bf8 18.Nd5 Nbxd5 19.exd5 Re7 20.b4 c4 21.Bg5 Ne4 22.Bxe4= -0.19/18 ]

13...cxd4= -0.14/19
[Rybka 3 : 13...Rad8 14.Bf2 cxd4 15.Bxd4 Nc5 16.Nd5 Bxd5 17.exd5 Rc8 18.Rac1 Nh5 19.Bxg7 Nxg7 20.g4 Na4 21.c3 Ne8 22.Nd3 Nf6 23.Nb4 Nc5 24.Qe3 -0.41/19 ]

14.Bxd4 -0.36/17 Nb6= 0.00/20
[Rybka 3 : 14...Rac8 15.Bf1 Nb6 16.Qe3 Nc4 17.Bxc4 Qxc4 18.Rd2 Rfe8 19.Rad1 a5 20.b3 Qc6 21.Ne2 a4 22.Nd3 axb3 23.Nb4 Qd7 -0.36/17 ]

15.b3 -0.39/18
[Rybka 3 : 15.Qe3 Nc4 16.Bxc4 bxc4 17.Rab1 Rab8 18.b4 cxb3 19.cxb3 Ba8 20.e5 dxe5 21.Qxe5 Qxe5 22.Bxe5 Rbd8 23.Nd3 Bh6 24.Bf4 Bg7 25.Be5 Bh6 26.Bf4 Bg7 27.Be5 Bh6 28.Bf4 Bg7 29.Be5 Bh6 30.Bf4= 0.00/20 ]

15...Rac8= -0.22/19
[Rybka 3 : 15...Nfd7 16.a4 Rfc8 17.Nxb5 axb5 18.a5 Nc4 19.bxc4 bxc4 20.Bxg7 Kxg7 21.Qd4+ f6 22.Rdb1 Ba6 23.c3 Rcb8 24.Rxb8 Qxb8 25.Qd5 Nc5 26.Bxc4 -0.39/18 ]

16.Rac1 -0.57/18
[Rybka 3 : 16.a4 Nfd7 17.Bxg7 Kxg7 18.Qd4+ Kg8 19.Nd5= -0.22/19 ]

16...e5 -0.46/20
17.Bxb6 -1.72/19
[Rybka 3 : 17.Bf2 Qxc3 18.Qxc3 Rxc3 19.Bxb6 d5 20.Ba5 Rcc8 21.exd5 Nxd5 22.c4 Bh6 23.Rb1 Ne3 24.Rd7 Bc6 25.Rc7 e4 26.cxb5 axb5 27.Rxc6 Rxc6 28.Bxb5 Rc5 29.a4 exf3 30.Bb6 Rc3 31.Bd4 Rcc8 32.Ba6 -0.46/20 ]

17...Qxb6+ -1.72/18
18.Kh1 -2.93/18
[Rybka 3 : 18.Kh2 Rfd8 19.b4 Qc7 20.Nd5 Nxd5 21.exd5 Qc3 22.Ra1 Qxd2 23.Rxd2 e4 24.Ra2 Bc3 25.Rd1 Re8 26.f4 f5 27.Kg1 Bxe1 28.Rxe1 Bxd5 29.Raa1 Be6 30.a4 -1.72/18 ]

18...Nh5 -2.59/16
19.Kh2 -2.93/18 Nf4 -2.58/18
20.Bf1 -2.58/20 Bh6 -2.39/18
21.Nd5? -4.02/22
[Rybka 3 : 21.Rb1 Nxg2 22.Qxg2 Rxc3 23.Rd3 Qc5 24.Rxc3 Qxc3 25.Bd3 d5 26.Kh1 Rd8 27.Qe2 Bc6 28.exd5 Bxd5 29.Rd1 Be6 30.Qe4 Bd2 31.Qh4 -2.39/18 ]

21...Bxd5 -4.02/21
22.exd5 -4.02/20 Kg7 -3.69/18
23.Rb1? -7.59/16
[Rybka 3 : 23.Nd3 Nxd5 24.f4 Nxf4 25.Qf2 Qxf2 26.Nxf2 Ne6 27.Ra1 Rxc2 28.Nd3 Rc3 29.Rab1 e4 30.Nb4 Nc5 31.Kg1 Rc8 32.Rxd6 Be3+ 33.Kh1 Rxb3 34.Rxb3 Nxb3 35.Rd1 Nd2 36.Be2 Nc4 37.Nxa6 Nxa3 38.Rd7 -3.69/18 ]

23...Nxh3 -5.84/17
24.Qd3? -#5/3
[Rybka 3 : 24.gxh3 Bf4 + -5.84/17 ]

24...Qg1+ -#5/3
25.Kxh3 -#4/3 Bf4 -#4/3
0-1

Nov-14-09  RandomVisitor: After 14...Nb6:

1: M Lamon - Sunil Weeramantry, Jacksonville 1990 1990


click for larger view

Analysis by Rybka 3 :

<[-0.13] d=25 15.Qe3> Nc4 16.Bxc4 bxc4 17.Rab1 Rac8 18.Na4 Rb8 19.Ba7 Ra8 20.Bd4 a5 21.b3 cxb3 22.cxb3 Bc6 23.Nc3 Rfc8 24.Qf2 e5 25.Be3 Rab8 26.Qd2 Rd8 27.Bg5 Qa7+ 02:23:30 1706843kN

May-12-20  ronaldpatzer: <Bodhidharma> b3 probably created too much pressure on the c3 knight and that pressure was part of the reason why black's attack achieved victory... It instigated 17. Bxb6... After 20... Bh6 you can see can not get out of the discovered attack because it has to defend the knight... losing another tempo to play 21. Nd5 was forced... Also, it is true that 17.Bf2 instead of Bxb6 would have been better, but then Qxc3 18.Qxc3 Rxc3 19.Bxb6 d5 20 Ba5 (20 exd5 Nxd5 Ba5 Rcc8) Rcc8 (threatening Bh6) {the pawn on c2 has become a problem) and a continuation like: 21.exd5 Nxd5 22.c4 Bh6 23.Rb1 Ne3 24.Rd7 Bc6 25.Rc7 Nf5 26.Bd3 Be3+ 27.Kh2 Bf4+ 28.Kg1 28...Ng3 and you can see that black already has more active pieces, a bishop on the outpost f4 a knight on g3 and white games look a lot harder. The computer points a continuation with perfect play like this: 9.Rb2 Rxc7 30.Bxc7 Be3+ 31.Kh2 Bf4 32.Kg1 Rc8 33.Bb6 f5 34.cxb5 Bxb5 35.a4 Bxd3 36.Nxd3 Bh6 37.Kh2 Nf1+ 38.Kg1 Ne3 and black has the file for the rook and a more promising passed pawn and more activity and invasive pieces. Now, white can hold on, but it is a very difficult position with only moves to try for equality. What many beginners like me wonder is this: why is this so threatening if it is only a small advantage for the computer? well! because those small advantages can easily grow with imperfect play, that's why! not to mention that psychologically speaking it is much harder to play with no counterplay, especially in a game with time controls.
May-12-20  ronaldpatzer: 16. Rac1 was also a bad move. Because the white queen lost space to move.

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