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Subject: Re: Worlds toughest mate in 4

Author: Rex

Date: 19:09:30 10/16/03

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AMD MP 2600+
Rebel 12 Cusomized Personality

58 seconds

00:00:00.7	1.73	1	60	Bxg2+ Qxg2
00:00:00.7	1.63	2	419	Bxg2+ Qxg2 Qxf5
00:00:00.7	1.63	2	751	Qxf5
00:00:00.7	3.25	2	973	Qxf5 Qh8 Bxg2+ Kxg2
00:00:00.7	3.07	3	2819	Qxf5 Qg3 Qh5+ Qh2
00:00:00.7	3.07	4	7865	Qxf5 Qg3 Qh5+ Qh2 Bxg2+
00:00:00.8	5.92	5	20908	Qxf5 Qh4 Bxg2+ Kxg2 Qg6+ Kh3 Qxg1 Qe4+
00:00:00.8	5.98	6	49449	Qxf5 Qg3 Qh5+ Qh2 Bxg2+ Kxg2 Rd2+ Bf2
00:00:00.9	7.37	7	198428	Qxf5 Qh6 Bxg2+ Kxg2 Qg4+ Kf2 Rxg1 Qh7+
00:00:01.1	7.35	8	423346	Qxf5 Qh6 Bxg2+ Kh2 Bf3 Qb6+ Ka2 Qf2+
00:00:02.6	8.66	9	2316280	Qxf5 Qh6 Bxg2+ Kh2 Bf1 Qb6+ Bb5 Bf2
00:00:03.4	8.35	10	3350737	Qxf5 Qh6 Bxg2+ Kh2 Bf1 Qb6+ Bb5 Be3
00:00:12.0	10.44	11	14829364	Qxf5 Qg3 Qh5+ Qh2 Bxg2+ Kxg2
00:00:37.1	14.19	12	49062449	Qxf5 Qh6 Bxg2+ Kh2 Bc6 Qe3 Qh7+
00:00:37.3	14.19	12	49462215	Ka2
00:00:37.6	14.19	12	49846020	Ka2
00:00:37.7	 Mate in 7	12	50006123	Ka2 f4 Bf3 Qg3 Rxg1+ Kh2 Rxg2+
00:00:38.3	 Mate in 7	12	50825477	Qa7
00:00:38.3	 Mate in 7	12	50825596	Qa7
00:00:38.3	 Mate in 7	12	50825477	Qa7
00:00:38.8	 Mate in 7	13	51542298	Ka2 f4 Rb1 Qg3 Rxg1+
00:00:39.1	 Mate in 7	13	52083677	Qf1
00:00:39.1	 Mate in 7	13	52083742	Qf1
00:00:39.2	 Mate in 7	13	52083677	Qf1
00:00:40.5	 Mate in 7	14	54377583	Ka2 f4 Bf3 Qg3 Rxg1+ Kh2 Rxg2+
00:00:43.1	 Mate in 7	15	58044908	Ka2 f4 Bf3 Qg3 Rxg1+ Kh2 Rxg2+
00:00:43.7	 Mate in 7	15	58787255	Qa7
00:00:43.7	 Mate in 7	15	58787374	Qa7
00:00:44.4	 Mate in 7	15	58787255	Qa7
00:00:47.2	 Mate in 7	15	63996060	Qf3
00:00:47.2	 Mate in 7	15	63996169	Qf3
00:00:49.8	 Mate in 7	15	63996060	Qf3
00:00:54.0	 Mate in 7	16	74094100	Ka2 f4 Bf3 Qg3 Rxg1+ Kh2 Rxg2+
00:00:54.2	 Mate in 7	16	74291630	Qf3
00:00:54.2	 Mate in 7	16	74291765	Qf3
00:00:57.2	 Mate in 7	16	74291630	Qf3
00:00:58.1	 Mate in 7	16	80656842	Qa7
00:00:58.1	 Mate in 7	16	80656961	Qa7
00:00:58.1	 Mate in 2	16	80660900	Qa7 f4 Bf3 Qh3 Qxg1#




On October 16, 2003 at 19:15:29, Dieter Buerssner wrote:

>On October 16, 2003 at 18:50:32, William Kerr wrote:
>
>>Post a tougher one than this if you know of one.
>
>This mate in 3 is much tougher for Yace
>
>[D] 8/1B6/8/5p2/8/8/5Qrq/1K1R2bk w - -
>
>Actually it needed 27 minutes to find a mate in 3 on P4 2.53 GHz ...
>I ran it in the background, forgot HT size. I saved this:
>
> 432058330 14:35.3  Mat03 12++ 1.Qa7 f4 2.Bf3 Qg3H 3.Qxg1#H {270}
> 432060376 14:35.3  Mat03 12t  1.Qa7 f4 2.Bf3 Qg3 3.Qxg1# {270}
>
>It is a null move issue (with slightly different eval and/or search rules, it
>can be found very fast).
>
>Qa7 was refuted at depth 11 by:
>
>  23530854  36.988  18.99 11x  1.Qa7 null 2.Rd7 null 3.Bxg2+ Qxg2 4.Rh7+ Bh2
>                               5.Rxh2+ Qxh2 6.Qb7+ Qg2 7.Qf3 Qxf3 {HT} {-1081}
>
>Regards,
>Dieter



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