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Subject: Re: Is the queen sac sound?

Author: Tord Romstad

Date: 01:56:53 12/30/03

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On December 29, 2003 at 20:44:06, Sune Fischer wrote:

>
>[D]8/6pk/4Q2p/3P1P1q/8/6P1/4rP2/2R3K1 w - - 0 56
>
>In the actual game Frenzee played d6!? and went on to win.
>
>In post mortem analysis it switches to Re1 with a bit more time, still
>sacrificing the queen.
>
>I've been playing a little bit with the eval scores for passed pawns
>and not surprisingly the position is very sensitive to these changes.
>
>Any other engines who wants to sacrifice the queen here, is it sound
>or a lucky punch?

Gothmog 0.4.4a (Pentium IV 2.4 GHz) agrees with Frenzee:

 1        2.44     0.00        105 d6 Rxe6 fxe6
 2        2.31     0.00        355 d6 Rd2
 3        2.20     0.01       2002 d6 Rxe6 fxe6 Kg6
 4        2.06     0.04       6697 d6 Rxe6 fxe6 Qd5 e7
 5        2.02     0.10      17323 d6 Rxe6 fxe6 Qe5 d7 Qd4
 6    >=  2.02     0.16      29437 d6 Rxe6 fxe6 Qe5 d7 Qd4 Re1
 6    >=  2.03     0.17      29547 d6 Rxe6 fxe6 Qe5 d7 Qd4 Re1
 6    >=  2.09     0.17      29904 d6 Rxe6 fxe6 Qe5 d7 Qd4 Re1
 6    <=  2.22     0.22      43177 d6 Rxe6 fxe6 Qd5 e7 Qd2 Rc8
 6    <=  2.20     0.22      44022 d6 Rxe6 fxe6 Qe2 d7 Qd2 Rc8
 6    >=  2.19     0.23      44581 d6 Rxe6 fxe6 Qe2 d7 Qd2 Rc8
 6    >=  2.20     0.23      44818 d6 Rxe6 fxe6 Qe2 d7 Qd2 Rc8
 6        2.20     0.23      44818 d6 Rxe6 fxe6 Qe2 d7 Qd2 Rc8
 7    >=  2.20     0.27      57223 d6 Rxe6 fxe6 Qe2 d7 Qd2 Rc8
 7    <=  2.20     0.36      83809 d6 Rxe6 fxe6 Qe2 d7 Qd3 Rc8
 7        2.20     0.36      83809 d6 Rxe6 fxe6 Qe2 d7 Qd3 Rc8
 8    >=  2.20     0.45     112462 d6 Rxe6 fxe6 Qe2 d7 Qd3 Rc8
 8    >=  2.22     0.46     114320 d6 Rxe6 fxe6 Qe2 d7 Qd3 Rc8
 8    >=  2.28     0.48     122368 d6 Rxe6 fxe6 Qe2 d7 Qd3 Rc8
 8    <=  2.41     0.56     148866 d6 Rxe6 fxe6 Qe2 d7 Qd3 Rc8 Qd1+ Kg2 Qd5+
                                   f3 Qd2+ Kh3
 8    <=  2.39     0.57     151442 d6 Rxe6 fxe6 Qe2 d7 Qd3 Rc8 Qd1+ Kg2 Qd5+
                                   f3 Qd2+ Kh3
 8    <=  2.36     0.63     168970 d6 Rxe6 fxe6 Qe2 d7 Qd3 Rc8 Qd1+ Kg2 Qd5+
                                   f3 Qd2+ Kh3
 8    <=  2.28     0.72     195988 d6 Rxe6 fxe6 Qe2 d7 Qd2 Rc8 Qd1+ Kg2 Qd5+
                                   f3 Qd2+ Kh3
 8        2.28     0.72     195988 d6 Rxe6 fxe6 Qe2 d7 Qd2 Rc8 Qd1+ Kg2 Qd5+
                                   f3 Qd2+ Kh3
 9    <=  2.27     1.19     345420 d6 Rxe6 fxe6 Qd5 e7 Qe6 Rd1 Qe2 Rd5 Kg8
 9    <=  2.25     1.21     352456 d6 Rxe6 fxe6 Qd5 e7 Qe6 Rd1 Qe2 Rd5 Kg8
 9    >=  2.23     1.37     406946 d6 Rxe6 fxe6 Qd5 d7 Kg6 Rc8 Qd1+ Kg2 Qd5+
                                   f3 Qa2+ Kf1 Qa6+ Kf2
 9    >=  2.25     1.40     418459 d6 Rxe6 fxe6 Qd5 d7 Kg6 Re1 Qd2 Re5 Qd3
 9        2.25     1.40     418459 d6 Rxe6 fxe6 Qd5 d7 Kg6 Re1 Qd2 Re5 Qd3
10    >=  2.25     1.70     526404 d6 Rxe6 fxe6 Qd5 d7 Kg6 Re1 Qd2 Re5 Qd3
                                   Kg2
10    >=  2.27     1.76     547903 d6 Rxe6 fxe6 Qd5 d7 Kg6 Re1 Qd2 Re5 Qd3
                                   Kg2
10    <=  2.31     2.80     871636 d6 Rxe6 fxe6 Kg6 Re1 Kf6 e7 Qe8 d7 Qxe7
                                   Rxe7 Kxe7
10    >=  2.31     2.98     929782 d6 Rxe6 fxe6 Kg6 Re1 Kf6 e7 Qe8 d7 Qxe7
                                   Rxe7 Kxe7
10        2.31     2.98     929782 d6 Rxe6 fxe6 Kg6 Re1 Kf6 e7 Qe8 d7 Qxe7
                                   Rxe7 Kxe7
11    <=  2.30    23.11    6768855 d6 Rxe6 fxe6 Qe2 d7 Qd2 Rc8 Qd1+ Kg2 Qd5+
                                   f3 Qa2+ Kf1 Qa6+ Kf2 Qb6+ Kg2 Qb2+ Kh3
11    <=  2.28    23.50    6916582 d6 Rxe6 fxe6 Qe2 d7 Qd2 Rc8 Qd1+ Kg2 Qd5+
                                   f3 Qa2+ Kf1 Qa6+ Kf2 Qb6+ Kg2 Qb2+ Kh3
11    >=  2.27    23.97    7087161 d6 Rxe6 fxe6 Qe2 d7 Qd2 Rc8 Qd1+ Kg2 Qd5+
                                   f3 Qa2+ Kf1 Qa6+ Kf2 Qb6+ Kg2 Qb2+ Kh3
11    >=  2.28    24.03    7111833 d6 Rxe6 fxe6 Qe2 d7 Qd2 Rc8 Qd1+ Kg2 Qd5+
                                   f3 Qa2+ Kf1 Qa6+ Kf2 Qb6+ Kg2 Qb2+ Kh3
11        2.28    24.03    7111833 d6 Rxe6 fxe6 Qe2 d7 Qd2 Rc8 Qd1+ Kg2 Qd5+
                                   f3 Qa2+ Kf1 Qa6+ Kf2 Qb6+ Kg2 Qb2+ Kh3
12    >=  2.28    25.13    7501462 d6 Rxe6 fxe6 Qe2 d7 Qd2 Rc8 Qd1+ Kg2 Qd5+
                                   f3 Qa2+ Kf1 Qa6+ Kg1 Qa1+ Kf2 Qa7+ Ke2
                                   Qa2+ Kd3 Qd5+ Kc2
12    >=  2.30    25.42    7604976 d6 Rxe6 fxe6 Qe2 d7 Qd2 Rc8 Qd1+ Kg2 Qd5+
                                   f3 Qa2+ Kf1 Qa6+ Kg1 Qa1+ Kf2 Qa7+ Ke2
                                   Qa2+ Kd3 Qd5+ Kc2
12    <=  2.34    40.13   11726740 d6 Rxe6 fxe6 Qe2 d7 Qd2 Rc8 Qd1+ Kg2 Qd5+
                                   f3 Qa2+ Kf1 Qa6+ Kg1 Qa1+ Kf2 Qa7+ Ke2
                                   Qa2+ Kd3
12    <=  2.33    41.80   12250353 d6 Rxe6 fxe6 Qe2 d7 Qd2 Rc8 Qd1+ Kg2 Qd5+
                                   f3 Qa2+ Kf1 Qa6+ Kg1 Qa1+ Kf2 Qa7+ Ke2
                                   Qa2+ Kd3
12    <=  2.30    43.99   12963923 d6 Rxe6 fxe6 Qe2 d7 Qd2 Rc8 Qd1+ Kg2 Qd5+
                                   f3 Qa2+ Kf1 Qa6+ Kg1 Qa1+ Kf2 Qa7+ Ke2
                                   Qa2+ Kd3
12        2.30    43.99   12963923 d6 Rxe6 fxe6 Qe2 d7 Qd2 Rc8 Qd1+ Kg2 Qd5+
                                   f3 Qa2+ Kf1 Qa6+ Kg1 Qa1+ Kf2 Qa7+ Ke2
                                   Qa2+ Kd3
13    >=  2.30    52.55   15776744 d6 Rxe6 fxe6 Qe2 e7 Kg6 Rb1 Kf7 Rb8 Qd1+
                                   Kg2 Qd5+ f3 Qd2+ Kh3 Qe1 Rf8+
13    <=  2.30     1:25   25234275 d6 Rxe6 fxe6 Qe2 e7 Kg6 Rb1 Kf7 Rb8 Qd1+
                                   Kg2 Qd5+ f3 Qd2+ Kh3 Qe1 Rf8+
13        2.30     1:25   25234275 d6 Rxe6 fxe6 Qe2 e7 Kg6 Rb1 Kf7 Rb8 Qd1+
                                   Kg2 Qd5+ f3 Qd2+ Kh3 Qe1 Rf8+

Tord



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