Author: Richard A. Fowell (fowell@netcom.com)
Date: 16:21:25 11/15/98
Go up one level in this thread
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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