Author: Gerd Isenberg
Date: 15:05:28 08/07/02
Go up one level in this thread
On August 07, 2002 at 10:08:31, José Carlos wrote:
> Also from a recent game on ICC:
>
>[D]1r1q1rk1/pbp1bp1p/1p2pnpQ/6N1/3P4/3B1N2/PPP2PPP/R4RK1 w - - 0 1 bm Ne5
>
> The game (the test is move 15):
>
>[Event "ICS Rated standard match"]
>[Site "204.178.125.65"]
>[Date "2002.08.07"]
>[Round "-"]
>[White "AvernoX"]
>[Black "Tinker"]
>[Result "1-0"]
>[WhiteElo "2310"]
>[BlackElo "2371"]
>[TimeControl "3600+10"]
>
>1. Nc3 d5 2. d4 Nf6 3. Bg5 e6 4. e4 dxe4 5. Bxf6 Qxf6 6. Nxe4 Qd8 7. Nf3
>Be7 8. Bd3 Nd7 9. Qe2 b6 10. O-O O-O 11. Neg5 g6 12. Qe4 Rb8 13. Qh4 Nf6
>14. Qh6 Bb7 15. Ne5 Qxd4 16. Bxg6 Qxe5 17. Bxh7+ Kh8 18. Bd3+ Kg8 19. Rae1
>Qf4 20. Re3 Bxg2 21. Kxg2
>{Tinker resigns} 1-0
With the little help of a "king in corner"- repetition heuristic IsiChess found
Ne5 in 12secs (depth 8) on my Athlon XP2000+ ~256MB Hash. I suppose that
programs that solve this fast, use similar. I think this heuristic is wellknown
but controversial. It can be combined with "contempt" factor.
I gave a rather high draw score (up to 2/3 pawn) in case of the first repetition
forced by queen with enemy king in corner (max taxidistance one from corner).
The amount of this draw score depends on the potential to strengthen the attack
quickly with other pieces. Of course this heuristic may fail, eg. IsiChess -
Diep WCCC02 Round 4, where IsiChess had +67 short before the final zero. But
against a strong(er) opponent a draw is fine. There was something to improve
because the estimation of strengthen the attack was quite too optimistic in the
Diep Game.
At least this heuristic solves some testpositions very fast, like the one from
BT-Test :-)
2krr3/pppb1ppp/3b4/3q4/3P3n/2P2N1P/PP2B1P1/R1BQ1RK1 b - - bm Nxg2
and hopefully this one here:
50secs (+70cp,ply 10) the first aberration from the draw line with the short
1.Ne5 Qxd4 2.Bxg6 Qxe5
after 2:23 with +99cp, after 7:19 +157cp++, fail high solved after 17:24 with
+210cp
1.Ne5 Bd6 2.Ng4 Re8 3.f4 Rc8 4.c3 Bd5 5.a4 Ra8 6.Nxf6+ Qxf6 7.Qxh7 Kf8
Cheers
Gerd
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