Author: Richard A. Fowell (fowell@netcom.com)
Date: 16:21:25 11/15/98
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On November 11, 1998 at 22:53:03, jonathan Baxter wrote: >On November 11, 1998 at 16:38:14, Bruce Moreland wrote: > >> >>On November 11, 1998 at 14:28:13, Ed Schröder wrote: >> >>>On a PII-266: 0:19 for Rxg7 and a mate announce after 0:50 with standard >>>settings. I assume the 2:34 is in case "combination" is set to "off". >>> >>>Analysis... >>> >>>1. Rxg7+ Rxg7 2. Rxg7+ Kxg7 3. Qe7+ Kg8 4. Qe8+ Kg7 5. h6+ Kxh6 6. Qf8+ >>>Kh5 7. Qf7+ Kh4 8. Qxh7+ Kg3 9. Qg7+ Kh4 10. Kf2 Qc5+ 11. Kg2 Qg1+ 12. >>>Kxg1 a4 13. Qg5+ Kh3 14. Qg2+ Kh4 15. Qh2# >>> >>>Biggest problem for computers the "quiet move" 10. Kf2 >> >>I'm a little slower. On a P2/300 mine finds the mate in 15 in 1:07, Rxg7+ found >>in 0:28. >> > >Just to see how easy the move is to find: I tried setting all eval except >material to 0 in my program. On a PII400 it finds Rxg7+ in 1:49 and sticks with >it (took 15 mins to find the mate but I don't have any special mating >extensions). > >Jon Here are some other results on my Mac 7300/180. Program Rxg7+ Forced Mate ==================================== CM4000 Mac <1 sec < 2 seconds (M14) MacChess 5.0b4 <1 sec 55 seconds (M15) MacChess 4.0 <1 sec not found in six minutes HIARCS 6 89 sec not found in six minutes Sigma Chess 4.01L unfound unfound Details: MacChess 5.0b4 finds: Rxg7+ in about 1/4 second Mate in 15 at 55 seconds. Mac 7300/180, 16M hash Log file - note that Kf2 is found. 04/01|00:00:00| 4592| -89| Qxc6 Rxc6 Kd2 Rcc8 04/32|00:00:00| 8423| +0| Rxg7+ Rxg7 Rxg7+ Kxg7 Qe7+ Kg8 Qe8+ Kg7 Qe7+ 05/01|00:00:00| 11680| +0| Rxg7+ Rxg7 Rxg7+ Kxg7 Qe7+ Kg8 Qe8+ Kg7 Qe7+ 06/01|00:00:00| 21936| +0| Rxg7+ Rxg7 Rxg7+ Kxg7 Qe7+ Kg8 Qe8+ Kg7 Qe7+ 07/01|00:00:01| 51362| +0| Rxg7+ Rxg7 Rxg7+ Kxg7 Qe7+ Kg8 Qe8+ Kg7 Qe7+ 08/01|00:00:01| 130234| +0| Rxg7+ Rxg7 Rxg7+ Kxg7 Qe7+ Kg8 Qe8+ Kg7 Qe7+ 09/01|00:00:02| 273769| +0| Rxg7+ Rxg7 Rxg7+ Kxg7 Qe7+ Kg8 Qe8+ Kg7 Qe7+ 10/01|00:00:04| 583204| +0| Rxg7+ Rxg7 Rxg7+ Kxg7 Qe7+ Kg8 Qe8+ Kg7 Qe7+ 11/01|00:00:08| 1324177| +0| Rxg7+ Rxg7 Rxg7+ Kxg7 Qe7+ Kg8 Qe8+ Kg7 Qe7+ 12/01|00:00:55| 10688848|+M15 | Rxg7+ Rxg7 Rxg7+ Kxg7 Qe7+ Kg8 Qe8+ Kg7 h6+ Kxh6 Qf8+ Kh5 Qf7+ Kh4 Qxh7+ Kg3 Qg6+ Kh3 Kf2 Qc5+ Kf1 Qxc4+ bxc4 Kh4 Qg5+ Kh3 Qg2+ Kh4 Qh2+ MacChess 5.0 should be publicly available by Christmas. Richard A. Fowell (fowell@netcom.com)
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