Author: leonid
Date: 17:20:54 04/06/01
Go up one level in this thread
On April 06, 2001 at 19:21:19, Heiner Marxen wrote: >On April 06, 2001 at 06:47:35, Paul wrote: > >>On April 06, 2001 at 05:16:39, leonid wrote: >> >>>Hi! >>> >>>If you like to sove one easy mate, you can try this: >>> >>>[D]NK2Q3/1B4Q1/3Q2PB/1N3Q1q/1bQ4n/2nqqq1b/rQ2q1Qr/R1rqkqrR w - - >>> >>>I remember that when this position was created around one month ago, I found >>>that it is mate for black and whites. >>> >>>Please indicate your results for both colors. >>> >>>Thanks, >>>Leonid. >> >>Hi Leonid! Hi, Paul and Neiner! >>Although I haven't been able to work on my program for the last couple of >>months, just for the record this is what the "old" Pretz says: >> >>White to move: 01:17 WM10 08 Qgxc3+ Bxc3 Qcxc3+ Rxc3 Qxc3+ Rd2 Rxd1+ Qxd1 Qxe3+ >>Qfxe3 Qfxf1+ Rxf1 Rxf1+ Qxf1 Qxe3+ Re2 Qxd1+ Kxd1 Qc1#, so a mate in 10. > >Chest confirms this insofar, as there is no mate in 9 (K7/600 350MB, 47.4 min). Now see that it is for sure mate in 10 moves. My program found for white mate in 10 moves but by selective search. Even through the selective and 10 moves deep it took 1 min. 15 sec. Computer - 600 Mhz Intel. >>Black to move: 00:01 BM7 05 Qxd6+ Qgc7 Qxe8+ Qc8 Qxc8+ Bxc8 Rxa8+ Rxa8 Qxb5+ >>Qxb5 Qxc7+ Kxc7 Qd6#, so a mate in 7. > >Chest confirms the above PV in 67 seconds. Our time for brute force is close but your is probably better, since your searched for all sulution for this position. Mine found solution (the first one) in 48 sec. Selective did better - 3 seconds. Salut to everybody!!! Leonid. >Old Pretz appears to be the Old Surehand of mate problems! > >Heiner > >>Salut! >>Paul
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