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Subject: Re: book bust?

Author: Dann Corbit

Date: 12:26:32 05/11/02

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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.

Long time analysis with Yace (featuring a hash collision):

usetime = 49999.00, mintime = 49999.00 maxtime = 49999.00 tl 49999.00 ml 0
         5   0.023  -3.22  1t  1...Qxd2+ 2.Qxd2 Nxd2 3.Kxd2 {-350}
        23   0.024  -1.92  1t  1...Nxf2 {-270}
        60   0.024  -1.92  1.  1...Nxf2 {-270}
       129   0.025  -1.92  2t  1...Nxf2 2.Qxf5 {-620}
      1547   0.030  -1.47  2++ 1...Ng3 2.e4 Nxh1 3.exf5 {-200}
      1611   0.030  -1.47  2t  1...Ng3 2.e4 {-350}
      1759   0.031  -1.47  2.  1...Ng3 2.e4 {-350}
      1975   0.032  -1.47  3t  1...Ng3 2.e4 Nxh1 {150}
      3075   0.035  -1.47  3.  1...Ng3 2.e4 Nxh1 {150}
      4338   0.038  -1.07  4++ 1...Ng3 2.fxg3 Bxc2 3.Bxg7 {231}
      4583   0.039   0.01  4++ 1...Ng3 2.fxg3 Bxc2 3.Bxg7 {231}
      6389   0.045   0.61  4t  1...Ng3 2.Qb3 Nxh1 3.Qxd5 {70}
      8943   0.051   0.61  4.  1...Ng3 2.Qb3 Nxh1 3.Qxd5 {70}
     14442   0.065   0.84  5t  1...Ng3 2.e4 Bxe4 3.Qc3 Qxc3 4.Bxc3H Nxh1H
                               5.Nxe4H dxe4H 6.Bxg7H {140}
     22010   0.077   0.84  5.  1...Ng3 2.e4 Bxe4 3.Qc3 Qxc3 4.Bxc3 Nxh1 5.Nxe4
                               dxe4 6.Bxg7 {140}
     44879   0.126   0.45  6t  1...Ng3 2.Bc3 Bxc2 3.Bxa5 Nxh1 4.Rc1H Bf5H
                               5.Rxc5H {70}
     72469   0.186   0.45  6.  1...Ng3 2.Bc3 Bxc2 3.Bxa5 Nxh1 4.Rc1 Bf5 5.Rxc5
                               {70}
    107459   0.262   0.33  7t  1...Ng3 2.Bc3 Qc7 3.e4 Nxh1 4.exf5 Rae8+ 5.Be2
                               Qxc6 {-120}
    390506   0.907   0.33  7.  1...Ng3 2.Bc3 Qc7 3.e4 Nxh1 4.exf5 Rae8+ 5.Be2
                               Qxc6 {-120}
    518639   1.197   0.42  8t  1...Ng3 2.Bc3 Qc7 3.Qb3 Nxh1 4.Qxd5 Be6 5.Qe5
                               Qxe5 6.Bxe5 {70}
   1070068   2.442   0.42  8.  1...Ng3 2.Bc3 Qc7 3.Qb3 Nxh1 4.Qxd5 Be6 5.Qe5
                               Qxe5 6.Bxe5 {70}
   1386067   3.161   0.46  9t  1...Ng3 2.Bc3 Bxc2 3.Bxa5 Nxh1 4.Rc1 Ba4 5.Rxc5
                               Rac8 6.c7 d4 {70}
   6478661  15.045   0.46  9.  1...Ng3 2.Bc3 Bxc2 3.Bxa5 Nxh1 4.Rc1 Ba4 5.Rxc5
                               Rac8 6.c7 d4 {70}
   7494841  17.634   0.34 10t  1...Ng3 2.Bc3 Bxc2 3.Bxa5 Nxh1 4.Rc1 Ba4 5.Rxc5
                               Rac8 6.c7 d4 7.Ne4 {70}
  31202627  1:20.5   0.34 10.  1...Ng3 2.Bc3 Bxc2 3.Bxa5 Nxh1 4.Rc1 Ba4 5.Rxc5
                               Rac8 6.c7 d4 7.Ne4 {70}
  37527271  1:39.2   0.73 11t  1...Ng3 2.Bc3 Qd8 3.Qb2 Nxh1 4.Bxg7 Re8H 5.Bh6H
                               d4H 6.c7H Qxc7H 7.O-O-OH {HT}
  63228428  2:40.2   0.73 11.  1...Ng3 2.Bc3 Qd8 3.Qb2 Nxh1 4.Bxg7 Re8 5.Bh6
                               d4 6.c7 Qxc7 7.O-O-O
  86040120  3:45.3   0.95 12t  1...Ng3 2.Qc1 Nxh1 3.g4 Bxg4 4.f3 Bf5 5.Bg2 Qc7
                               6.f4 Nf2 7.Kxf2 Qxc6H {-30}
 138725413  5:55.9   0.95 12.  1...Ng3 2.Qc1 Nxh1 3.g4 Bxg4 4.f3 Bf5 5.Bg2 Qc7
                               6.f4 Nf2 7.Kxf2 Qxc6 {-30}
 169151231  7:24.9   0.71 13t  1...Ng3 2.Qc3 Qxc3 3.Bxc3 Nxh1 4.g4 Bxg4 5.f3
                               Bf5H 6.Bg2H Rac8H 7.Rd1H {HT}
 536981207 23:40.3   0.71 13.  1...Ng3 2.Qc3 Qxc3 3.Bxc3 Nxh1 4.g4 Bxg4 5.f3
                               Bf5 6.Bg2 Rac8 7.Rd1
 700714127 31:47.1   0.75 14t  1...Ng3 2.Qc3 Qxc3 3.Bxc3 Nxh1 4.g4 Bxg4 5.Bg2
                               d4 6.Ba5 Rae8 7.f3 d3 8.fxg4 Rxe2+ 9.Kf1 {HT}
                               {-40}
1647988257 1:14:16   0.75 14.  1...Ng3 2.Qc3 Qxc3 3.Bxc3 Nxh1 4.g4 Bxg4 5.Bg2
                               d4 6.Ba5 Rae8 7.f3 d3 8.fxg4 Rxe2+ 9.Kf1 {HT}
                               {-40}
1983902474 1:33:02   0.88 15t  1...Ng3 2.Qc3 Qxc3 3.Bxc3 Nxh1 4.g3 Rfe8 5.Bg2
                               d4 6.Bxd4 cxd4 7.Bxh1 Re7 8.Nb3 Rd8 9.Rd1 d3
                               {80}
 +---+---+---+---+---+---+---+---+
8| r |   |   |   |   | r | k |   |
 +---+---+---+---+---+---+---+---+
7| p |   |   |   |   | p | p | p |
 +---+---+---+---+---+---+---+---+
6|   |   | P |   |   |   |   |   |
 +---+---+---+---+---+---+---+---+
5| q |   | p | p |   | b |   |   |
 +---+---+---+---+---+---+---+---+
4|   |   |   |   | n |   |   |   |
 +---+---+---+---+---+---+---+---+
3| P |   |   |   |   |   |   |   |
 +---+---+---+---+---+---+---+---+
2|   | B | Q | N | P | P | P | P |
 +---+---+---+---+---+---+---+---+
1| R |   |   |   | K | B |   | R |
 +---+---+---+---+---+---+---+---+
   a   b   c   d   e   f   g   h
setboard r7/p4pkp/2P5/q2p1Q2/n7/P1p5/3NBPPP/2R1K2R w K - 0 8
hashmove c3d4
haskey 0xe463530b,0x9efe437c
Warning table move 0x6d2 invalid, nodes 2376155340, rep 5108184
3790158875 2:54:42   0.88 15.  1...Ng3 2.Qc3 Qxc3 3.Bxc3 Nxh1 4.g3 Rfe8 5.Bg2
                               d4 6.Bxd4 cxd4 7.Bxh1 Re7 8.Nb3 Rd8 9.Rd1 d3
                               {80}
 388320688 3:44:20   0.91 16t  1...Ng3 2.Qc3 Qxc3 3.Bxc3 Nxh1 4.g3 Rfe8 5.Bg2
                               d4 6.Bxd4 cxd4 7.Bxh1 Rab8 8.c7 Rb2 9.Rc1 h6
                               {HT} {80}
3246586073 9:17:03   0.91 16.  1...Ng3 2.Qc3 Qxc3 3.Bxc3 Nxh1 4.g3 Rfe8 5.Bg2
                               d4 6.Bxd4 cxd4 7.Bxh1 Rab8 8.c7 Rb2 9.Rc1 h6
                               {HT} {80}
2012453291 12:06:03   0.72 17t  1...Ng3 2.Qc3 Qxc3 3.Bxc3 Nxh1 4.g4 Bxg4 5.Bg2
                               Rfe8 6.f3 Bf5 7.Bxh1 Re3 8.Ne4 dxe4 9.Kd2 Rxc3
                               {HT} {580}




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