Author: John Merlino
Date: 15:30:19 05/12/00
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On May 12, 2000 at 16:21:01, blass uri wrote: >[D]1r3nk1/3rb1p1/p2p1pP1/1p2p3/Pnq1P1R1/2N1B3/1PPR3P/2NQ3K w - - 0 1 > >This position is from the ssdf games(Junior5-Junior6). >The evaluation was close to equality and suddenly Junior5 failed high and found >more than 1 pawn advantage for white. > >I post this position to demonstrate the fact that tactics is not only >sacrifices. > >Unfortunately tactical test positions are usually sacrifices. > >I am also not sure if there is only one good move for white. >White played in the game Rg2. >This is a good move with the idea to give mate by Rh4 and Qh5 but I am not sure >if this is the only good move and it is possible that axb5 and after it Rg2 also >give the same result(I did not check it) > >The point is not to find Rg2 but to find a significant change in the evaluation. > >How much do programs need to fail high? > >I think it is a good idea to generate a tactical test suite based on positions >from practical games and not based on finding sacrifices. > >In order to do it we need to analyze many games and find cases when there is a >significant change in the evaluation. > > >Uri Wow! That was a tough one.... Chessmaster 7000 on a PII-450 saw 1.axb5 from the start, and for over an hour it never changed. Starting at about 30 minutes, it was thinking for quite a long time about Rdg2, and it finally switched to Rdg2 after 1:06:23 The result, at depth 5/11 after about 1:06:00.... 1.Rdg2 d5 2.exd5 Rxd5 3.Qf3 Rd4 4.Bxd4 exd4 5.axb5 axb5 6.Rh4 with a score of 1.30 for White. The score for 1.axb5 at the same depth was 0.71 for White. jm
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