Author: Vincent Diepeveen
Date: 14:42:17 06/22/00
Go up one level in this thread
On June 22, 2000 at 08:36:13, Robert Hyatt wrote:
>On June 22, 2000 at 08:03:25, Vincent Diepeveen wrote:
>
>>In games versus crafty you usual can escape to a draw in open positions with
>>queens, as it misses checks in qsearch. Take this objectively as that this
>>is not a complaint against crafty, because on the other hand crafty
>>searches non-checking lines usual deeper because of not doing checks in
>>qsearch.
>>
>>The only risk i run with diep is that it wants to win too much in those
>>queen pos.
>>
>>At fics old diep version (last linux compile from months ago)
>>runs under diep against a crafty.
>>
>>Move diep roboElvis
>> 1. d4 (0:01) Nf6 (0:01)
>> 2. c4 (0:00) e6 (0:00)
>> 3. Nf3 (0:00) d5 (1:40)
>> 4. Nc3 (0:00) c5 (0:00)
>> 5. cxd5 (0:00) Nxd5 (0:00)
>> 6. e3 (0:00) Nc6 (0:00)
>> 7. Bc4 (0:00) cxd4 (1:41)
>> 8. exd4 (0:00) Bb4 (1:40)
>> 9. Qd3 (0:00) Nb6 (2:40)
>> 10. Bb3 (2:56) Nd7 (0:01)
>> 11. Qd1 (1:43) O-O (1:18)
>> 12. O-O (1:41) Nf6 (0:05)
>> 13. Bg5 (1:33) h6 (1:31)
>> 14. Bf4 (0:04) Na5 (1:16)
>> 15. Ba4 (0:23) Nc4 (1:53)
>> 16. Qb3 (1:18) Bxc3 (1:12)
>> 17. bxc3 (1:16) Na5 (0:49)
>> 18. Qc2 (1:15) Nd5 (0:01)
>> 19. Bg3 (1:15) Bd7 (0:07)
>> 20. Bxd7 (1:07) Qxd7 (0:04)
>> 21. Ne5 (1:10) Qd8 (0:06)
>> 22. Rfc1 (1:17) Rc8 (1:17)
>> 23. Qb2 (0:00) a6 (1:25)
>> 24. c4 (1:10) Ne7 (1:10)
>> 25. Qb4 (0:00) Nf5 (1:09)
>> 26. Nf3 (0:01) Re8 (1:06)
>> 27. Be5 (1:11) f6 (1:07)
>> 28. Bg3 (1:11) Re7 (0:12)
>> 29. d5 (1:00) exd5 (0:16)
>> 30. cxd5 (0:53) Rxc1+ (0:13)
>> 31. Rxc1 (0:56) Rd7 (0:11)
>> 32. Qe1 (0:56) Kh8 (1:32)
>> 33. Bf4 (1:07) g5 (0:00)
>> 34. Bd2 (1:31) Rxd5 (0:01)
>> 35. Bc3 (1:33) Nc6 (0:00)
>> 36. Qe6 (1:01) Nfd4 (1:08)
>> 37. Nxd4 (1:01) Nxd4 (0:06)
>> 38. Qe4 (0:54) Rc5 (0:14)
>> 39. h4 (0:45) Rc4 (1:20)
>> 40. hxg5 (1:00) hxg5 (1:07)
>> 41. f4 (0:52) Qb6 (1:07)
>> 42. Qe8+ (0:00) Kg7 (1:05)
>> 43. Qe7+ (0:00)
>> {Still in progress} *
>>
>>Qb6? Diep directly saw a draw!
>>diep(C)(2177)[27] whispers: pv = 00:21 950233 (96172) 9 -0.15 h4xg5 h6xg5
>>\ Bc3-b2 Rc4xc1 Bb2xc1 Nd4-c6 Qe4-f3 Kh8-g7 Bc1-b2 Qd8-d6
>>fics%
>>diep(C)(2177)[27] whispers: pv = 00:46 4915150 (1081413) 9 -0.12 f2-f4 Qd8-b6
>>\ Qe4-e8 Kh8-g7 Qe8-e7 Kg7-g6 Qe7-e8 Kg6-f5 Qe8-d7 Nd4-e6 Kg1-h1 Qb6-c6
>>\ Qd7-d3 Kf5xf4
>>fics%
>>diep(C)(2177)[27] whispers: pv = 00:48 2237499 (417374) 10 0.00 Qe4-e8 Kh8-g7
>>\ Qe8-e7 Kg7-g6 Qe7-e8 Kg6-f5 Qe8-d7 Kf5-g6 Qd7-e8
>>fics%
>>diep(C)(2177)[27] whispers: pv = 00:33 1446958 (247075) 10 0.00 Qe8-e7 Kg7-g6
>>\ Qe7-e8 Kg6-f5 Qe8-d7 Kf5-g6 Qd7-e8
>>
>>I didn't see kibitzes from crafty. I wonder what depth crafty sees
>>Qb6 is a draw.
>>
>>Vincent
>>
>
>
>
>I don't think the depth here matters. It depends on whether one program
>thinks it is behind or not, as to whether it is going to see the draw. One
>side can force the draw. If a program thinks that side is ahead, then it will
>think it best to avoid the draw, and it won't see it ever.
>
>I try to fix things that I believe are costing me games. I don't see this
>happening often enough to offset the depth it gets in non-checking lines which
>helps it see more non-checking things.
White is behind a pawn. Just before seeing this checking sequence score
got up from -0.59 to -0.12 to 0.00
Again: I can't blame you from not doing checks. It's simply a choice you
make. In blitz at icc i'm quite
sure that getting another ply, so getting from 7 to 8 ply is usual
more important as getting from 10 to 11.
Yet when getting huge search depth, so 10 and beyond, if checks would
only eat at most a ply in heavy tactical open positions, then i prefer
doing the checks as you miss otherwise 4 ply (i'm using R=3 in DIEP therefore
instead of 2).
My vision of qsearch is that it should be as accurate as possible, without
wasting too much nodes in qsearch.
Vincent
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