Author: Uri Blass
Date: 03:30:35 12/26/02
Go up one level in this thread
On December 26, 2002 at 06:06:10, Sune Fischer wrote: >On December 26, 2002 at 05:59:23, Uri Blass wrote: > >>On December 26, 2002 at 05:17:03, Sune Fischer wrote: >> >>>On December 25, 2002 at 23:23:48, Drexel,Michael wrote: >>> >>>>[D] Q2Q2Q1/1R6/3BR3/3k3N/2RB2Q1/5R2/Q2Q2Bp/3N3K w - - 0 1 >>>> >>>>Problem: >>>>White to move >>>>If white gives check it has to be mate in one. >>>>Find a legal position with the highest number of possible checks. >>>> >>>>I discovered this 5 years ago. Took me about 16 hours to find it. >>>>I think it is possible to find a proof that it is not possible to find more: >>>> >>>>85 mates in one! :-) >>> >>>Are you sure, I "only" count 78 mates?? >>> >>>Mates ply 0........: 0 >>>Mates ply 1........: 78 >>>Mates ply 2........: 0 >>>Mates ply 3........: 468 >>>Mates ply 4........: 0 >>>Mates ply 5........: 9538 >>> >>>how did you count them? >>> >>>>I must have been crazy. >>> >>>Yes, you will fit right in here :) >>> >>>-S. >> >> >>modified perft of movei agree with your numbers. >> >>It counts 1380065-10084 mates at ply 7 and 0 mates in ply 8 >> >>Number of stalemates >>52 at depth 1 >>781-52 at depth 3 >>12034-781 at depth 5 >>2095567-12034 at depth 7 >> >>Can you check that these numbers are correct? > >I get: > >Ply CheckMates Stalemates >0 0 0 >1 78 52 >2 0 0 >3 468 729 >4 0 0 >5 9538 11253 >6 0 0 >7 1369981 2083533 > >I'm running the ply 9 now, going to take a while so don't hold your breath ;) > >I wonder how long before black gets a mate, that pawn could promote and become >dangerous! > >-S. It needs 6 plies to promote but I guess that even 10 plies or 12 plies are not enough for mate. 1.Qb1 Kxc4 2.Bh3 Kd5 3.Kg2 h1Q+ 4.Kg3 but even here I do not see a short mate for black(no mate in 5 plies) 4...Qxf3+ is logical here and after this move white has 207 mate in 2 but black has no mate in 2. white has 370326 mates in 3 but black has no mate in 3 after white possible replies that mean mate in 7 from the initial position. Uri
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