Author: leonid
Date: 20:15:16 05/06/01
Go up one level in this thread
On May 06, 2001 at 18:33:26, Heiner Marxen wrote: >On May 06, 2001 at 11:55:05, Paul wrote: > >>On May 06, 2001 at 10:13:27, leonid wrote: >> >>>On May 06, 2001 at 06:22:26, leonid wrote: >>> >>>>Hello! >>>> >>>>If you would like to solve a mate, you can try this moderate position: >>>> >>>>[D]Qqrkrq1Q/1QqqqqQ1/qBbnnbBq/1NQ2QN1/8/2Q2Q2/3RR3/3K4 w - - >>>> >>>>Please indicate your result. >> >>Ok ... my guess, before Heiner moves in with his heavy artillary, a mate in 9: >> >>06:18 WM9 09 Bxc7+ Qbxc7 Qxc7+ Qxc7 Qxd6+ Qcxd6 Nxe6+ Qexe6 Qfxf6+ Re7 Rxd6+ >>Qxd6+ Qxd6+ Bd7 Qhxf8+ Qxf8 Qcc7# > >Ok, here arrives the artillery: > >After 4.3 hours on K7/600 with 350 MB hash Chest mutters "No solution in 8 >moves." And because of the following timing: > >depth seconds ># 3 0.03 0.96 104- 0 ># 4 0.28 1.06 1135- 0 ># 5 2.53 1.18 9900- 0 ># 6 52.20 1.30 157103- 0 ># 7 837.84 1.55 2855222- 699 ># 8 15562.53 1.65 49837105- 41089204 > >15562.53 / 837.84 = 18.574 > >I will stop here, and not invest another 4.3 * 18.574 = 79.868 hours, >or 3.327 days. Ok? > >We now know, that it is a mate in 9, we are just not sure whether there are >more key moves to solve the mate in 9. Thanks, Heiner! Always very appreciated. By knowing for sure that this is mate in 9, I can put later brute force to search for it. It could be very useful for me when I would need to see the time difference between two different versions. It could be all time used as position for verification for bugs by everybody. Have a good night! And for you as well, Paul. Leonid. > >Aah, and yet again: Pretz found the shortest line, Paul! And Chest did not! >Praise to Pretz! > >Well, that was enough chess problem solving for a weekend. Was fun! :-) >A nice next week to all! > >Heiner
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