Computer Chess Club Archives


Search

Terms

Messages

Subject: Re: Junior 8 Bishop sac on h2, similar to the one in the Kasparov game?

Author: Tord Romstad

Date: 13:04:52 07/23/03

Go up one level in this thread


On July 23, 2003 at 11:55:41, Anson T J wrote:

>Hiarcs 8 - Junior 8
>Junior 8 Test London (37.1), 23.07.2003
>
>1.d4 d5 2.c4 c6 3.Nc3 e6 4.Nf3 Nf6 5.e3 Nbd7 6.a3 Bd6 7.Bd3 0-0 8.0-0 h6
>0.34/18  2:51  9.c5 (Bd2)  0.33/12  9:45  9...Bc7  0.06/20  4:56  10.Qc2
>0.17/12  21  e5  -0.05/18  2:14  11.dxe5  -0.01/13  2:56  Nxe5 (Ng4)  -0.01/19
>1:33  12.Nxe5  0.12/12  2:29  Bxe5  -0.05/19  0  13.b4 (Ne2)  0.05/12  5:08
>13...a5 (b6)  -0.10/17  3:01  14.Bb2  0.39/12  3:40  Re8 (Bd7)  0.21/17  5:15
>15.Na4 (Ne2)  0.30/11
>
>[d]r1bqr1k1/1p3pp1/2p2n1p/p1Ppb3/NP6/P2BP3/1BQ2PPP/R4RK1 b - - 0 15
>
>2:43 Bxh2+ {0.00/16 3:28}

Interesting game!  Gothmog also likes Bxh2.  It chooses this move on
ply 8 after 5 seconds of thought, and keeps it as its best move at least
until iteration 13 (when I stopped the search):

 1      -0.30     0.00         22 e5b2 c2b2 a5b4 a3b4
 1      -0.26     0.00         83 c8d7 b2e5 e8e5
 1      -0.17     0.00        135 f6e4 b2e5 e8e5
 1      -0.14     0.00        237 d8c7
 2      -0.12     0.00        394 d8c7 b2e5 c7e5
 3      -0.12     0.01       1660 d8c7 b2e5 c7e5
 4      -0.30     0.03       4508 d8c7 b2e5 c7e5 a4b6
 4      -0.29     0.04       7382 e5h2 g1h2 f6g4 h2g1 d8h4 f1d1 h4h2 g1f1
                                  h2h1 f1e2 h1g2
 4      -0.19     0.14      18887 e5c7 f1b1 c8g4 b4b5
 5      -0.13     0.29      42209 e5c7 b4b5 f6e4 d3e4 d5e4
 5      -0.09     0.31      45134 e5b2 c2b2 a5b4 a3b4 c8d7
 5      -0.08     0.33      48329 a5b4 b2e5 e8e5 a3b4 f6e4
 6      -0.23     0.39      59174 a5b4 b2e5 e8e5 a3b4 f6e4 a4b6
 7      -0.26     0.87     144072 a5b4 b2e5 e8e5 a3b4 d8c7 a4b6 e5h5
 7      -0.25     0.94     156339 e5b2 c2b2 a5b4 a3b4 c8d7 a4b6 a8a1 f1a1
 7      -0.06     2.11     367863 e5c7 f1d1 a5b4 a3b4 c8d7 d3f5 d7f5 c2f5
 8      -0.18     4.19     736218 e5c7 b4a5 a8a5 b2c3 a5a8 a1d1 c8g4 d1b1
 8       0.09     5.41     957375 e5h2 g1h2 f6g4 h2g1 d8h4 f1e1 h4h2 g1f1
                                  h2h1 f1e2 h1g2 d3h7 g8f8 e2d1 g4f2 d1c1
 9       0.38    14.18    2543709 e5h2 g1h2 f6g4 h2g1 d8h4 f1e1 h4h2 g1f1
                                  h2h1 f1e2 h1g2 d3h7 g8h8 e2d1 g2f2
10       0.45    37.96    6689103 e5h2 g1h2 f6g4 h2g1 d8h4 f1e1 h4h2 g1f1
                                  h2h1 f1e2 h1g2 e2d2 a5b4 a3b4 g4f2
11       0.52    93.37   16598395 e5h2 g1h2 f6g4 h2g1 d8h4 f1e1 h4h2 g1f1
                                  h2h1 f1e2 h1g2 e2d2 g4f2 d2c1 f2d3 c2d3
12       0.20   202.46   37141384 e5h2 g1h2 f6g4 h2g1 d8h4 f1e1 h4h2 g1f1
                                  h2h1 f1e2 h1g2 e2d2 g2f2 e1e2 f2f3 c2c3
                                  f7f6
13       0.18   746.76  135346358 e5h2 g1h2 f6g4 h2g1 d8h4 f1e1 h4h2 g1f1
                                  h2h1 f1e2 h1g2 e2d2 g2f2 e1e2 f2f3 b2d4
                                  a5b4 a3b4

The columns are search depth, eval, time in seconds (yes, I should make
it display the time as mm:ss), nodes searched and principal variation.

As you can see, Gothmog prefers Kg1 rather than Kg3 after Bxh2+ Kxh2 Ng4+.
It considers white's king too exposed after this sequence of moves; if
I let the program analyse the position after these moves it evaluates it
as almost +2 for black (drops to +1 after two minutes).

What does other programs think about this position?  Are there any strong
players here who can comment on the correctness of the sacrifice?

>Live game:
>http://mysite.freeserve.com/intagrand/junior8/index.htm

The rest of the game is also very exciting.  Thanks for the link!

Tord



This page took 0 seconds to execute

Last modified: Thu, 15 Apr 21 08:11:13 -0700

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