Author: Uri Blass
Date: 04:43:05 03/09/02
Go up one level in this thread
On March 09, 2002 at 07:30:23, Heiner Marxen wrote: >On March 09, 2002 at 06:38:25, Olaf Jenkner wrote: > >>On March 08, 2002 at 18:06:57, Olaf Jenkner wrote: >> >>>>After 15 minutes (Athlon 1500+, 128 MB hash) Chest says "no mate in 12". >>>>With an EBF above 6 this extrapolates to 8 years for the mate in 19. >>>>Uhh. >>>>Not reachable for Chest, as is. >>>> >>>>Cheers, >>>>Heiner >>> >>>After 22 minutes (PII 333MHz, 88 MB hash) Gustav says "no mate in 13". >>>It seems to be possible to reach mate in 19 with brute force. I will >>>run the mate in 15 this night. >>> >>>OJe >>After 4,5 hours (PII 333MHz, 88 MB hash) Gustav says "no mate in 16". >>It is possible to reach mate in 19 with brute force >> >>OJe > >If this is really "brute force", i.e. with unrestricted white moves, >then Gustav shows a very impressive performance, here. >It still extrapolates to 25 days, but that appears to be much more accessible. My extrapolation is different No mate in 13 was proved in 22 minutes No mate in 16 was proved in 4.5 hours that mean 270 minutes. 270/22<13 It means based on extrapolation that 270*13 minutes are enough to find mate in at most 19 that is the shortest mate. The hardware was only pII333 (88Mbytes hash) I believe that today there is hardware that is at least 4.5 times faster and on this hardware 13 hours is going to be enough based on extrapolation. Uri
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