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Subject: Re: a test position for chess programs(tactics but not sacrifice)

Author: Ed Schröder

Date: 15:51:23 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

The latest Rebel running under EPD2DIAG:

00:01  07.00  0.44  1.axb5 axb5 2.Nd5 Nxd5 3.exd5 Qc7 4.Qf1 Bd8 5.Qh3
00:03  08.00  0.37  1.axb5 axb5 2.Nd3 Ra8 3.Nxb4 Qxb4 4.Qc1 Qc4 5.Nd5 Ra2
00:11  09.00  0.44  1.axb5 axb5 2.Nd3 Ra8 3.Rf2 Nc6 4.Nd5 Qa2
00:23  09.15  0.44  1.Rdg2
00:28  09.15  0.75  1.Rdg2 d5 2.exd5 Nxd5 3.Rxc4 Nxe3 4.Qf3 Nxc4 5.axb5 axb5
6.Nd3
00:47  10.00  0.80  1.Rdg2 d5 2.exd5 Qc7 3.axb5 axb5 4.Rh4 f5 5.Rh5 Bc5 6.Bxc5
Qxc5
01:23  11.00  0.68  1.Rdg2 d5 2.exd5 Qc8
01:37  11.01  0.80  1.axb5 axb5 2.Rdg2 d5 3.exd5 Qc7 4.Rh4 f5 5.Rh5 Bc5 6.Bxc5
02:06  12.00  0.84  1.axb5 axb5 2.Rdg2 d5 3.exd5 Nxd5 4.Rxc4 Nxe3 5.Qxd7 Nxd7
6.Rc7 Nxg2 7.Rxd7 b4 8.Rxe7 bxc3
03:54  13.00  0.89  1.axb5 axb5 2.Rdg2 d5 3.Rh4 f5 4.Rh3 Rd6 5.exf5 Rf6
04:35  13.01  0.98  1.Rdg2 d5 2.exd5 Qc8 3.Qf3 Qd8 4.axb5 Nxd5 5.Nxd5 Rxd5 6.b6

Ed

• Fail high... What's a mother to do? Choosy mothers are said to choose.. Dann Corbit 16:48:17 05/12/00
  • Re: Fail high... What's a mother to do? Choosy mothers are said to choose.. Gian-Carlo Pascutto 14:02:53 05/14/00
    • Re: Fail high... What's a mother to do? Choosy mothers are said to choose.. Dann Corbit 14:11:17 05/15/00
      • Re: Fail high... What's a mother to do? Choosy mothers are said to choose.. Gian-Carlo Pascutto 15:04:40 05/15/00
  • Re: Fail high... What's a mother to do? Choosy mothers are said to choose.. Robert Hyatt 18:45:10 05/12/00

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