Author: Howard Exner
Date: 16:46:37 12/19/97
Go up one level in this thread
On December 19, 1997 at 12:31:29, Bruce Moreland wrote:
>I think this problem may be tougher than several of the Nolot problems:
>
>5b2/2R1Nq1k/6p1/1P1Pp1Bp/4b3/7P/6P1/6K1 b - - 0 1
>
>The key is Bxg2.
>
>This is from Abramovich vs Benjamin, 1984, as published on page 55 of
>Chess Life and Review, Dec '97.
>
>The solution given there is:
>
>1. ... Bxg2 2. Kxg2 e4 3. d6 Qf3+ 4. Kh2 Bg7 5. Nc6 Qe2+ 6. Kh1 e3 7.
>Re7 Qd1+ 8. Kg2 Qd5+ 9. Kf1 Qxb5+ 10. Ke1 Qxc6 11. d7 Qc1+ 0-1
>
>It took my program 20 plies to find the key (ten hours and six minutes
>on a PII/300).
>
>My PV was 1. ... Bxg2 2. Kxg2 e4 3. b6 Bg7 4. Nc6 Qf3+ 5. Kh2 Qf2+ 6.
>Kh1 Qxb6 7. Bf4 Qb1+ 8. Kh2 Qc2+ 9. Kg3 e3 10. Bxe3 h4+ 11. Kf3 Qf5+ 12.
>Ke2 Qxd5 13. Kf2 Qd6 14. Rc8 Qg3+ 15. Ke2
>
>I haven't tried to see if this makes any sense.
>
>Perhaps it would take other programs less time, since Bxg2 only scored
>0.2 points higher than the move that had been preferred previously
>(Kh8), or perhaps someone else just has better extensions and eval than
>I do for this particular problem. I would like to hear other results,
>if someone wants to try this problem.
I ran this on Rebel 8 (K-233 with 60 MB Hash) with the following PV:
1. Bf8-g7
06:05 12.00 2.61 Bf8-g7 b5-b6 Be4xg2 Kg1xg2 e5-e4 Ne7-c8 Qf7-f3+
Note the Bxg2 on the second move. Maybe B-g7 is better since it seems a
necessary defensive move (it is also played in the eval's above). There
doesn't appear to be anything better for white than b6 (d6? Qa7). I
actually prefer the move Bg7 since it is more subtle, unless I'm missing
some deeper defense by white (some other move other than b6).
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