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Subject: Re: Avoid move position (baron bug)

Author: Will Singleton

Date: 13:51:32 01/09/03

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>If I force Qxa2 in the Baron, it takes (on a PII-500) about 8 minutes to show a
>good score for white. Before that the score was drawish:
>
> ply       time     nodes  score  pv
>
>  4( 5)&      0      2677    -97  b1a1 a2c2 e2d1 c2d1
>  4( 5)&      0      4177    -95  f1g2 d7d5 c4d5 f6d5 e1d1
>  4( 5)&      0      6202    -85  f1h3 a7a5 h3f5 a2b3
>  4( 5).      0      6202    -85  f1h3 a7a5 h3f5 a2b3
>  5( 7)&      0     13751    -97  f1h3 d7d5 c4d5 b7d5 h3f5 a2b3
>  5( 8)&      0     24718    -68  b1a1 a2b3 e1b1 b3c2 f1g2
>  5( 8).      0     24718    -68  b1a1 a2b3 e1b1 b3c2 f1g2
>  6( 7)&      0     32893    -75  b1a1 a2b2 e1b1 b2c2 e2d1 c2d1
>  6( 8)&      0     48516    -74  e1c1 a7a5 e2d1 d7d6 c1c2 a2a3
>  6( 9)&      0     68001    -73  e1d1 a2a5 b1b5 a5a4 f1g2 d7d5
>  6( 9).      0     76590    -73  e1d1 a2a5 b1b5 a5a4 f1g2 d7d5
>  7(11)&      1    155625    -84  e1d1 d7d6 b1a1 a2c2 d1c1 c2b2 f1g2
>  7(11)&      2    182124    -69  b1a1 a2b3 e1b1 b3c2 b1c1 c2b2 c1b1 b2c2 <rep>
>  7(11).      2    190208    -69  b1a1 a2b3 e1b1 b3c2 b1c1 c2b2 c1b1 b2c2 <rep>
>  8(10)+      2    239464    -34  b1a1 a2b3 e1b1 b3c2 b1c1 c2a4
>  8(10)&      2    250394      0  b1a1 a2b3 e1b1 b3c2 b1c1 c2b3 c1b1 <rep>
>  8(10).      2    259413      0  b1a1 a2b3 e1b1 b3c2 b1c1 c2b3 c1b1 <rep>
>  9(13)-      3    353117    -35  b1a1 a2b2 e1c1 a7a6 e2d1
>  9(13)&      4    399832    -35  b1a1 a2b2 e1b1 b2c2 e2d1 c2d1 b1d1
>  9(13).      4    399858    -35  b1a1 a2b2 e1b1 b2c2 e2d1 c2d1 b1d1
> 10(13)+      5    568285      0  b1a1 a2b2 e1b1 b2c2 b1c1 c2b3 c1b1 b3c2 <rep>
> 10(13)&      5    593947      0  b1a1 a2b3 e1b1 b3c2 b1c1 c2b3 c1b1 <rep>
> 10(14).      6    647624      0  b1a1 a2b3 e1b1 b3c2 b1c1 c2b3 c1b1 <rep>
> 11(15)&      8    940933      0  b1a1 a2b3 e1b1 b3c2 b1c1 c2b3 c1b1 <rep>
> 11(15).     10   1102013      0  b1a1 a2b3 e1b1 b3c2 b1c1 c2b3 c1b1 <rep>
> 12(22)&     46   4543837      0  b1a1 a2b3 e1b1 b3c2 b1c1 c2b3 c1b1 <rep>
> 12(22).     56   5485941      0  b1a1 a2b3 e1b1 b3c2 b1c1 c2b3 c1b1 <rep>
> 13(21)&    117  11236269      0  b1a1 a2b3 e1b1 b3c2 b1c1 c2b3 c1b1 <rep>
> 13(21).    146  14006096      0  b1a1 a2b3 e1b1 b3c2 b1c1 c2b3 c1b1 <rep>
> 14(23)+    239  22183609     35  b1a1 a2b3 e1b1 b3c2 b1c1 c2d2 e2d2 f6g4
> 14(24)&    484  42965262    120  b1a1 a2b3 e1b1 b3c2 b1c1 c2c1 d2c1 f6g4
> 14(24).    638  55906104    120  b1a1 a2b3 e1b1 b3c2 b1c1 c2c1 d2c1 f6g4

Richard,

You must have a problem here.  8 min is way too long.  Perhaps a problem with
repetition and hash.

[D]r3r1k1/pbpp1pp1/1p3n1p/8/2PPp3/2P1P1P1/q2BQP1P/1R2RBK1 w - -

Amateur shows +1.7 in 8 secs:

8 -201 163 584342 c5 d6 cxd6 cxd6 Bg2 Ba6 Qd1 Bd3
9 -182 425 1508721 c5 Bc6 Ra1 Qe6 cxb6 cxb6 Bg2 d5 Ra6
9 0 433 1561526 Ra1 Qc2 Rc1 Qb3 Rb1 Qc2 Rc1
10 0 443 1660070 Ra1 Qc2 Rc1 Qb3 Rb1 Qc2 Rc1
11 0 479 1853613 Ra1 Qc2 Rc1 Qb3 Rb1 Qc2 Rc1
12 81 654 2681634 Ra1 Qc2 Rc1 Qb3 Be1 d5 c5 Kf8
13 177 819 3718292 Ra1 Qc2 Rc1 Qb3 Be1 Nd5 Rb1 Nxc3 Rxb3 Nxe2 Bxe2 Bc6 d5 Bb7
14 224 1161 5927341 Ra1 Qc2 Rc1 Qb3 Be1 Nd5 Rb1 Nxc3 Rxb3 Nxe2 Bxe2 d5 Ra3 dxc4
Rxa7

Will



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