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Subject: Re: some test positions (the usual everyday brilliancies, etc.)

Author: Uri Blass

Date: 13:19:23 12/09/02

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On December 09, 2002 at 13:13:15, Roy Eassa wrote:

>On December 09, 2002 at 13:01:51, Roy Eassa wrote:
>
>>On December 04, 2002 at 21:44:53, Mike S. wrote:
>>
>>>CM9000_Utz12n - Ruffian 1.0.1 [D21]
>>>[D]rnb1k2r/p3q1p1/2pnp2p/5pN1/3P4/Q1NB4/5PPP/R3R1K1 w kq - 0 19
>>>19.Nxe6! Bxe6 20.d5 Ne4 [20...cxd5 21.Nxd5 Bxd5 (21...Qd7? 22.Rxe6+ Qxe6
>>>23.Nc7+) 22.Bb5++-] 21.Bxe4 fxe4 22.dxe6 Qxa3 23.Rxa3 Ke7 24.Nxe4 Kxe6 25.Rd3
>>>Kf7 26.Ng5+ hxg5 [26...Kg6 27.Rd6+ Kxg5 28.Re5+ Kf4 29.Rde6 mit schnellem Matt.]
>>>27.Rf3+ Kg6 28.Re6+ [28.Re6+ Kh7 29.Rh3+ Kg8 30.Re8+ Kf7 31.Rexh8] 1-0
>>
>>
>>This is a good "subset" test: How long before your program selects Rd3! AND
>>detects that White is winning (by at least 2 pawns)?
>>
>>[d] rn5r/p5p1/2p1k2p/8/4N3/R7/5PPP/4R1K1 w - - 0 7
>
>7.Rd3! Kf7
>
>   [7...a5 8.Nd6+ Kf6 9.Ne8+ Rxe8
>      (9...Kf7 10.Rf3+ Kg8
>         (10...Kg6 11.Rg3+ forces mate)
>       11.Re7 Rh7 12.Nc7 +-)
>    10.Rxe8 +-]
>
>8.Ng5+! Kg6
>
>   [8...hxg5 9.Rf3+ Kg6 10.Re6+ +-]
>
>9.Rd6+! Kxg5 10.Re5+ Kf4 11.Rde6 Nd7
>
>   [11...Rd8 12.g3+ Kf3 13.h3 Rd1+ 14.Re1 and mates]
>
>12.g3+ Kf3 13.Re4 Rhf8 14.h3 and mates

Latest movei(p850,128 mbytes hash) can see a big advantage with Rf3 and later
changes it's mind to Ng5+

depth=13 +1.64 a3f3 a7a5 e4c5 e6d6 c5b7 d6d5 b7a5 d5d6 a5b7 d6d5 e1d1 d5c4 b7d6
c4b4 f3f7 h8d8 f2f3 d8g8 f7b7 b4c5 d6e4 c5c4
Nodes: 149431021 NPS: 170123
Time: 00:14:38.37
depth=13 +1.65 e4g5
Nodes: 380212477 NPS: 178355
Time: 00:35:31.77
depth=13 +1.74 e4g5 e6d7 a3d3 d7c8 g5f7 h8f8 e1e7 g7g5 f7d6 c8d8 e7h7 b8a6 d6b5
d8c8 b5a7 a8a7 h7a7 a6c7 g1f1 g5g4
Nodes: 443839428 NPS: 178398
Time: 00:41:27.91
depth=14 +1.54 e4g5 e6d7 a3d3 d7c8 g5f7 h8f8 e1e7 g7g5 f7d6 c8d8 e7h7 b8a6 d6b5
d8e8 d3d7 f8f6 b5d6 f6d6 d7d6 a8b8 d6e6 e8d8 h7h8 d8d7 h8h6
Nodes: 463979732 NPS: 178437
Time: 00:43:20.23

I am not sure if Rd3 is the only winning move.

Uri

• Re: some test positions (the usual everyday brilliancies, etc.) Roy Eassa 15:25:22 12/09/02
• Re: some test positions (the usual everyday brilliancies, etc.) Mike S. 15:12:53 12/09/02

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