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Subject: Re: pawn sac

Author: Richard Pijl

Date: 13:21:32 01/12/05

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On January 12, 2005 at 13:51:34, Vaidotas wrote:

>Hallo all!
>
>While playing on playchess my program CM_9000(TO5) found a nice win in the game
>vs Fruit. Here is a diagram:
>
>[D]r1r3k1/1q4p1/1pN1pp1p/1P1n4/P1R5/6P1/2Q2PP1/3R2K1 w - - 0 47
>
>a5!

The Baron on a P4-2.4 needs almost a minute to find a5:

 ply       time        nodes   score  pv
  5( 7)&   0:00.38     13185   +1.56  Qc2-e2 Qb7-d7 Rd1-e1 Rc8-e8 Qe2-g4
  5(10).   0:00.55     37528   +1.56  Qc2-e2 Qb7-d7 Rd1-e1 Rc8-e8 Qe2-g4
  6( 9)&   0:00.60     52442   +1.30  Qc2-e2 Qb7-d7 Qe2-g4 Kg8-h7 Rc4-e4
                                      f6-f5
  6(10)&   0:00.77     79606   +1.37  Qc2-e4 Qb7-d7 Rd1-e1 Rc8-e8 Qe4-g6
                                      Kg8-h8
  6(13).   0:00.88    109925   +1.37  Qc2-e4 Qb7-d7 Rd1-e1 Rc8-e8 Qe4-g6
                                      Kg8-h8
  7(11)&   0:01.10    164938   +1.51  Qc2-e4 Qb7-d7 Rd1-e1 Rc8-e8 Qe4-g6
                                      Nd5-e7 Nc6xe7 Re8xe7
  7(11)&   0:01.26    212338   +1.57  Qc2-e2 Qb7-d7 Qe2-h5 Qd7-f7 Qh5-h3
                                      f6-f5 Rc4-d4
  7(13).   0:01.76    356670   +1.57  Qc2-e2 Qb7-d7 Qe2-h5 Qd7-f7 Qh5-h3
                                      f6-f5 Rc4-d4
  8(12)&   0:02.58    593549   +1.38  Qc2-e2 Rc8-e8 Qe2-h5 f6-f5 Rc4-d4
                                      Qb7-f7 Qh5-h3 Nd5-f6
  8(14).   0:03.62    910686   +1.38  Qc2-e2 Rc8-e8 Qe2-h5 f6-f5 Rc4-d4
                                      Qb7-f7 Qh5-h3 Nd5-f6
  9(14)&   0:06.59   1710843   +1.46  Qc2-e2 Qb7-d7 Qe2-h5 Qd7-f7 Qh5-h3
                                      f6-f5 Rd1-c1 Kg8-h7 g3-g4
  9(15).   0:09.66   2609291   +1.46  Qc2-e2 Qb7-d7 Qe2-h5 Qd7-f7 Qh5-h3
                                      f6-f5 Rd1-c1 Kg8-h7 g3-g4
 10(15)&   0:16.91   4609452   +1.28  Qc2-e2 Rc8-e8 Qe2-f3 Qb7-f7 Rc4-d4
                                      Re8-c8 Qf3-g4 f6-f5 Qg4-h3 Nd5-f6
 10(18).   0:30.04   8566954   +1.28  Qc2-e2 Rc8-e8 Qe2-f3 Qb7-f7 Rc4-d4
                                      Re8-c8 Qf3-g4 f6-f5 Qg4-h3 Nd5-f6
 11(16)&   0:42.02  12002045   +1.41  Qc2-e2 Rc8-e8 Qe2-f3 Qb7-f7 g3-g4
                                      Re8-c8 Rc4-d4 Qf7-d7 Rd1-e1 Qd7-d6 Rd4-e4
 11(18)&   0:56.13  16571335   +1.78  a4-a5 b6xa5 Rd1xd5 e6xd5 Nc6-e7
                                      Qb7xe7 Rc4xc8 Ra8xc8 Qc2xc8 Kg8-f7 b5-b6
                                      Qe7-e2 Qc8-c7 Kf7-g6 b6-b7
 11(21).   0:58.00  17209739   +1.78  a4-a5 b6xa5 Rd1xd5 e6xd5 Nc6-e7
                                      Qb7xe7 Rc4xc8 Ra8xc8 Qc2xc8 Kg8-f7 b5-b6
                                      Qe7-e2 Qc8-c7 Kf7-g6 b6-b7
 12(19)&   1:05.30  19581685   +1.59  a4-a5 b6xa5 Rd1xd5 e6xd5 Nc6-e7
                                      Qb7xe7 Rc4xc8 Ra8xc8 Qc2xc8 Kg8-f7 b5-b6
                                      Qe7-e2 b6-b7 Qe2-d1 Kg1-h2 Qd1-h5 Kh2-g1
 12(19).   1:16.73  23395636   +1.59  a4-a5 b6xa5 Rd1xd5 e6xd5 Nc6-e7
                                      Qb7xe7 Rc4xc8 Ra8xc8 Qc2xc8 Kg8-f7 b5-b6
                                      Qe7-e2 b6-b7 Qe2-d1 Kg1-h2 Qd1-h5 Kh2-g1
 13(21)&   1:37.98  29616928   +1.66  a4-a5 b6xa5 Rd1xd5 e6xd5 Nc6-e7
                                      Qb7xe7 Rc4xc8 Ra8xc8 Qc2xc8 Kg8-f7 b5-b6
                                      Qe7-e2 Qc8-d7 Kf7-g6 b6-b7 Qe2-e5 Qd7-d8
                                      Qe5-a1
 13(22).   2:16.60  41386260   +1.66  a4-a5 b6xa5 Rd1xd5 e6xd5 Nc6-e7
                                      Qb7xe7 Rc4xc8 Ra8xc8 Qc2xc8 Kg8-f7 b5-b6
                                      Qe7-e2 Qc8-d7 Kf7-g6 b6-b7 Qe2-e5 Qd7-d8
                                      Qe5-a1
 14(24)&   2:57.57  54253401   +1.70  a4-a5 b6xa5 Rd1xd5 e6xd5 Nc6-e7
                                      Qb7xe7 Rc4xc8 Ra8xc8 Qc2xc8 Kg8-f7 b5-b6
                                      Qe7-e2 b6-b7 Qe2-d1 Kg1-h2 Qd1-h5 Qc8-h3
                                      Qh5-e5 Qh3-d7 Kf7-g6 Qd7-b5



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