Author: Roy Eassa
Date: 11:05:50 05/11/02
Go up one level in this thread
On May 10, 2002 at 22:35:02, Jon Dart wrote:
>There's a known position in the Classical Nimzo-Indian as follows:
>
>[D] r4rk1/p4ppp/2P5/q1pp1b2/4n3/P7/1BQNPPPP/R3KB1R b KQ - -
>
>Crafty has a book line here continuing Rab8 c7. My database shows several games
>with this line, including Rogers-Ward, BCF ch-T 1997-8, a draw. Eliskases played
>d4 against Bololjubow in 1937, another draw. But a search from this position
>gives the continuation Ng3, with advantage to Black:
>
>
> 10 3.31 -- 1. ... Ng3
> 10 3.99 -0.98 1. ... Ng3 2. Bc3 Qc7 3. Qb3 Nxh1 4.
> Qxd5 Be6 5. Qe5 Qxe5 6. Bxe5 Rad8
> 10-> 10.66 -0.98 1. ... Ng3 2. Bc3 Qc7 3. Qb3 Nxh1 4.
> Qxd5 Be6 5. Qe5 Qxe5 6. Bxe5 Rad8
> 11 13.44 ++ 1. ... Ng3!!
> 11-> 29.14 -1.37 1. ... Ng3 2. Bc3 Qc7 3. Qb3 Nxh1 4.
> Qxd5 Be6 5. Qe5 Qxe5 6. Bxe5 Rad8
> 12 34.77 -- 1. ... Ng3
> 12 37.50 -0.87 1. ... Ng3 2. Qc3 Qxc3 3. Bxc3 Nxh1
> 4. g4 Bxg4 5. Bg2 d4 6. Ba5 Rae8 7.
> f3 d3 8. fxg4 Rxe2+
> 12-> 1:55 -0.87 1. ... Ng3 2. Qc3 Qxc3 3. Bxc3 Nxh1
> 4. g4 Bxg4 5. Bg2 d4 6. Ba5 Rae8 7.
> f3 d3 8. fxg4 Rxe2+
> 13 2:07 -0.87 1. ... Ng3 2. Qc3 Qxc3 3. Bxc3 Nxh1
> 4. g4 Bxg4 5. Bg2 d4 6. Ba5 Rae8 7.
> f3 d3 8. fxg4 Rxe2+
> time=3:20 cpu=99% mat=3 n=133137602 fh=93% nps=664k
> ext-> chk=5470267 cap=361754 pp=602423 1rep=458117 mate=32558
> predicted=0 nodes=133137602 evals=24036969
> endgame tablebase-> probes done=0 successful=0
> hashing-> trans/ref=22% pawn=6% used=99%
>
>Arasan and Hiarcs give a similar result, at least at a few minutes' search time.
>Ng3 is surprising, to say the least. Whether it's really good or not, I'm not
>sure.
>
>--Jon
Some analysis, with help from Fritz:
1...Ng3 2.Qc3 Qxc3 3.Bxc3 Nxh1 4.c7
[4.g4 Bxg4 5.Bg2 Rfe8 6.Nf3 d4 7.Ba5 Rac8 8.c7 d3 9.e3 Nxf2
10.Kxf2 Re7 11.Rc1 Rexc7 12.Bxc7 Rxc7 13.Bf1 Bxf3 14.Kxf3 d2
15.Rd1 Rd7 16.Bc4 Kf8 17.Ke2 ±]
4...Rac8
[4...a5 5.g4 Bxg4 6.Bg2 d4 7.Bxa8 dxc3 8.Ne4 Rxa8 9.f3 Be6
10.0-0-0 Rf8 11.Rd8 f6 12.Nxc5 Bc8 13.Nd7! Bxd7 14.Rxd7 +-]
5.Ba5 Rfe8 6.g3 Bd3
[6...d4 7.Rc1 Bd3 8.Rxc5! Bxe2 9.Bxe2 d3 10.Rd5! Rxe2+ 11.Kf1 Rxf2+
12.Kg1 Re2 13.Rd8+ Re8 14.Kxh1 Kf8 15.Nc4 Ke7 16.Rxd3 +-]
7.Nb3! Bb5
[7...Bc4 8.Nxc5 Kf8 9.Rb1 f5 10.Rb2 Ke7 11.Bg2 Nxf2 12.Kxf2 Kd6
13.Nb7+ Kd7 14.Bh3 g6 15.g4 Rf8 16.gxf5 gxf5 17.Kf3+- followed by Kf4]
[7...c4 8.Nd4 Re7 9.Bh3 f5 10.Bg2 Be4 11.f3 Bd3 12.Kf1 +-]
8.Nxc5 f5
[8...Kf8 9.e3 Bxf1 10.Kxf1 Ke7 11.Kg2 Kd6 12.Rc1 Nxf2
13.Kxf2 and eventually wins the exchange for the pawn]
9.e3 Bxf1 10.Kxf1 Kf7 11.Rd1 Re5 12.Kg2 Nxf2 13.Kxf2 h6 14.Rc1 Re7
15.Nb7 Rd7 16.Rc6 Ke7 17.Kf3 d4 18.Rg6 Kf8
[18...Kf7 19.Nd6+ Kxg6 20.Nxc8 +-]
19.Nd6 Rcxc7 20.Bxc7 Rxc7 21.exd4 +-
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