Author: Darrel Briley
Date: 17:57:12 02/12/05
Go up one level in this thread
On February 12, 2005 at 20:31:33, Darrel Briley wrote: >On February 12, 2005 at 20:23:40, Eran Karu wrote: > >>On February 12, 2005 at 20:12:17, Darrel Briley wrote: >> >>>On February 12, 2005 at 20:03:07, Eran Karu wrote: >>> >>>>[D]1rb2rk1/4R1p1/1pqn1pBp/3p4/5Q2/1NP3PP/6PK/4R3 w - - 0 30 >>>> >>>>The position above comes from Zappa-Searcher, CCT6. Here Be8 wins the exchange, >>>>but R1e6!! wins overwhelmingly. The game continued 30. Re6 Bxe6 31. Nd4 Qc4 32. >>>>Qxd6 Bxh3 33. Kxh3 Kh8 35. Nf5 and it is obvious Zappa's attack is too strong >>>>for Black to survive. Zappa won on move 43. >>>> >>>>Can Shredder 9 UCI as White find R1e6? I am eager to know it. Please post >>>>results here. >>>> >>>>Thanks, >>>>Eran Karu >>> >>>Shredder9 UCI in Chessbase gui, 256mb Hash, AthlonXP 2600+ (and other programs >>>running) in about 30 seconds. >>> >>>New game, >>>1rb2rk1/4R1p1/1pqn1pBp/3p4/5Q2/1NP3PP/6PK/4R3 w - - 0 1 >>> >>>Analysis by Shredder 9 UCI: >>> >>>1. +- (2.68): 1.R1e6 Bxe6 2.Nd4 Qc4 3.Qxd6 Bxh3 4.Kxh3 Kh8 5.Nf5 Rg8 6.Qxf6 Qf1 >>>7.Kh2 Rbf8 8.Rxg7 Qxg2+ 9.Kxg2 >>>2. +- (2.23): 1.Be8 Rxe8 2.Rxe8+ Nxe8 3.Qxb8 Kf7 4.Re2 Nd6 5.Nd4 Qc5 6.Qa7+ Nb7 >>>7.Re3 Kg8 8.Re8+ Kf7 9.Rh8 Qxc3 10.Qxb6 Qc1 >>> >>>(Bee, 12.02.2005) >> >>Darrel, >> >>Interesting, first Shredder 9 picked R1e6 as a best move, then it changed mind >>and picked Be8. Well, can you please let your Shredder 9 UCI analyze it for 5 >>minutes in the classic interface and not in CB interface please? I am interested >>to know results of a long time analysis. >> >>Thanks again, >>Eran Karu > >Eran, > >I'd be happy to check it further in the classic interface, but to first clarify, >it picked Be8 first, and then decided on Re6 There is something very strange happening here. First to be thorough, I went back and did a 5 minute analysis in Chessbase gui, and Shredder first considers Be8 and then very quickly goes back and forth between Be8 and Re6, until at about 30 seconds deciding on Re6 for good. Here is the analysis after 5 minutes. Note that the number 1 is just the PV at the moment, not the first move considered. 1. +- (4.63): 1.R1e6 Rb7 2.Rxd6 Qxc3 3.Rxb7 Bxb7 4.Rxb6 Bc8 5.Qd6 Qe5 6.Bh7+ Kf7 7.Rb7+ Bxb7 8.Qd7+ Qe7 9.Bg6+ Kxg6 10.Qxe7 Rf7 11.Qe8 d4 12.Nxd4 Bd5 13.Qc8 f5 14.Qe8 2. +- (1.89): 1.Be8 Rxe8 Now, for the strange part. Shredder 9 in the classic interface looks at no other move other than Be8....I let it go the full 5 minutes, and here are the results. 12/13 0:01 +1.89 1.Be8 Rxe8 (769.872) 541 13/19 0:02 +1.89 1.Be8 Rxe8 (1.592.002) 553 14/22 0:06 +1.89 1.Be8 Rxe8 (3.399.377) 559 15/22 0:11 +1.89 1.Be8 Rxe8 (6.466.214) 569 16/26 0:21 +1.89 1.Be8 Rxe8 (12.050.144) 571 17/32 0:53 +2.14++ 1.Be8 Rxe8 (29.763.832) 554 17/38 1:05 +2.15 1.Be8 Rxe8 2.Rxe8+ Nxe8 3.Qxb8 Kf7 4.Re3 Qc7 5.Qa8 Qb7 (35.737.756) 549 18/40 1:57 +2.03 1.Be8 Rxe8 2.Rxe8+ Nxe8 3.Qxb8 Kf7 4.Qa7+ Qb7 (64.476.026) 551 19/42 4:00 +2.04 1.Be8 Rxe8 2.Rxe8+ Nxe8 3.Qxb8 Kf7 4.Re3 Qc7 5.Qa8 Qb7 6.Qa3 Qc7 7.Nd4 Nd6 8.Qa4 Kg8 9.Qa8 (131.374.449) 546 best move: Bg6-e8 time: 5:15.953 min n/s: 542.199 CPU 99.5% n/s(1CPU): 544.923 nodes: 171.292.732 I would like to say that I've mainly used Shredder9 UCI in the Shredder8 interface...I don't know if this has any effect on the test. (I run the engine on ICC under the hand "Under-Rated" in the Chessbase gui using Winboard to connect.
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