Author: leonid
Date: 13:57:58 06/07/01
Go up one level in this thread
On June 07, 2001 at 12:24:14, Heiner Marxen wrote: >On June 04, 2001 at 21:30:34, leonid wrote: > >>On June 04, 2001 at 17:47:05, Heiner Marxen wrote: >> >>>On June 04, 2001 at 11:10:30, leonid wrote: >>> >>>>On June 02, 2001 at 23:54:08, leonid wrote: >>>> >>>>>Hi! >>>>> >>>>>If you would like to solve some easy mate then try this: >>>>> >>>>>[D]qqnqBB2/rqqNQQ2/kqQQQRnK/rqqNQR2/bbqQQQ2/8/8/8 w - - >>> >>>Hello Loenid, >>> >>>First it is "easy", then it is for champions... and after nearly 30 hours >>>my K7/600 has not even finished depth 8! Geez! What exactly is easy about >>>this one? Chest obviously does not get it. >> >>Sorry, Heiner! It was my mistake. When I realized it, I put: "For Champions!". >> >>You are almost at the end of solving it. By selective it was solved in 9 moves >>in only 3 sec. My brute force was not very lucky but I expected that it is just >>my bad lack. Already 6 moves (brute forcce) took 1 hour and 19 min. > >Well, I can offer the following: there is no mate in 8. I.e. your solution >in 9 moves is the shortest possible. For this Chest on a K7/600 with >meager 30 MB hash needed 39.3 hours. Phew. > >It is a near miss. From the refutation table I see that several white moves >had several failed refutation attempts. The effective branching factor also >is not as small as usual: > >depth seconds ># 3 0.07 0.99 61- 0 ># 4 1.52 1.26 2736- 0 ># 5 22.81 1.76 50574- 0 ># 6 313.59 2.30 785471- 82685 ># 7 5894.43 2.19 16536107- 15749676 ># 8 141517.29 1.82 427443358- 426656927 > >Cheers, >Heiner Thanks for data! Very appreciated. Cheers, Leonid.
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