Computer Chess Club Archives


Search

Terms

Messages

Subject: book bust?

Author: Jon Dart

Date: 19:35:02 05/10/02


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



This page took 0.07 seconds to execute

Last modified: Thu, 07 Jul 11 08:48:38 -0700

Current Computer Chess Club Forums at Talkchess. This site by Sean Mintz.