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Subject: Re: Zugzwang

Author: Richard Pijl

Date: 07:32:15 09/10/04

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On September 10, 2004 at 10:18:30, Mihaly Szalai wrote:

>From the game Jung - Szabados (1952)
>
>[D]8/6B1/p5p1/Pp4kp/1P5r/5P1Q/4q1PK/8 w - - 0 32
>
>32. Qxh4! Kxh4 33. Bf6+ g5 34. Bc3!!
>
>Hiarcs 9 have problems with it even after 20 minutes.
>
>Show it to your engine.
>
>Thanks
>Mihaly

The Baron on a Xeon 2.8 changes to Qxh4 after almost 2 minutes:

 ply       time        nodes   score  pv
 15(40).   1:02.02  27348378   +0.00  Bg7-f6 Kg5xf6 Qh3xh4 Kf6-e6 Qh4-d8 Qe2-e5
                                      Kh2-h3 Qe5-d6 Qd8-c8 Ke6-d5 Qc8-c3 Kd5-e6
                                      Qc3-c8 <rep>
 16(37)&   1:40.91  44708835   +0.00  Bg7-f6 Kg5xf6 Qh3xh4 Kf6-e6 Qh4-d8 Qe2-e5
                                      Kh2-h3 Qe5-f5 Kh3-g3 Qf5-e5 Kg3-h3 <rep>
 16(41)+   1:54.11  50758487   +0.35  Qh3xh4 (Kg5xh4) (Bg7-f6) (g6-g5)
(Bf6-c3)(Qe2xg2)
                                      (Kh2xg2) (g5-g4) (Bc3-e1) (Kh4-g5) (f3xg4)
(h5-h4)
                                      (Be1-f2) (Kg5-f4) (Bf2xh4) (Kf4xg4)
(Kg2-g1) (Kg4xh4)
                                      (Kg1-f2) (Kh4-g5) (Kf2-e3) (Kg5-g6)
(Ke3-d3)
 16(41)+   1:54.69  51023002   +1.25  Qh3xh4 (Kg5-f5)
 16(41)&   4:54.95 159216026   +5.63  Qh3xh4 Kg5xh4 Bg7-f6 g6-g5 Bf6-c3 Qe2-f2
                                      Bc3-e5 Qf2-g1 Kh2xg1 g5-g4 Be5-f4 g4-g3
                                      Bf4-e5 Kh4-g5 Be5xg3 Kg5-f5 Kg1-f2 Kf5-e6
                                      Bg3-f4 Ke6-d5 g2-g4
 16(41).   5:00.62 161695914   +5.63  Qh3xh4 Kg5xh4 Bg7-f6 g6-g5 Bf6-c3 Qe2-f2
                                      Bc3-e5 Qf2-g1 Kh2xg1 g5-g4 Be5-f4 g4-g3
                                      Bf4-e5 Kh4-g5 Be5xg3 Kg5-f5 Kg1-f2 Kf5-e6
                                      Bg3-f4 Ke6-d5 g2-g4
 17(38)&   5:02.89 163402244   +5.79  Qh3xh4 Kg5xh4 Bg7-f6 g6-g5 Bf6-c3 Qe2-f2
                                      Bc3-e5 Qf2-g1 Kh2xg1 g5-g4 Kg1-h2 g4xf3
                                      g2xf3 Kh4-g5 Kh2-g3 Kg5-f5 f3-f4 Kf5-e6
                                      Kg3-h4 Ke6-d5 Kh4xh5 Kd5-c4
 17(44).   5:44.53 181879572   +5.79  Qh3xh4 Kg5xh4 Bg7-f6 g6-g5 Bf6-c3 Qe2-f2
                                      Bc3-e5 Qf2-g1 Kh2xg1 g5-g4 Kg1-h2 g4xf3
                                      g2xf3 Kh4-g5 Kh2-g3 Kg5-f5 f3-f4 Kf5-e6
                                      Kg3-h4 Ke6-d5 Kh4xh5 Kd5-c4
 18(38)+   5:45.57 182667889   +6.14  Qh3xh4 (Kg5xh4) (Bg7-f6) (g6-g5) (Bf6-c3)
(Qe2-f2)
                                      (Bc3-e5) (Qf2-g1) (Kh2xg1) (g5-g4) (f3-f4)
(g4-g3)
                                      (f4-f5) (Kh4-g5) (f5-f6) (Kg5-g6) (Kg1-f1)
(Kg6-g5)
                                      (Kf1-e2) (Kg5-h6) (Be5xg3) (Kh6-h7)
(Bg3-h4) (Kh7-g6)
 18(39)&   5:51.37 187378807   +6.24  Qh3xh4 Kg5xh4 Bg7-f6 g6-g5 Bf6-c3 Qe2-f2
                                      Bc3-e5 Qf2-g1 Kh2xg1 g5-g4 f3-f4 g4-g3
                                      f4-f5 Kh4-g5 f5-f6 Kg5-g6 Kg1-f1 h5-h4
                                      Kf1-e2 Kg6-f7 Ke2-f3 Kf7-e6 Kf3-g4 Ke6-f7



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