Author: Mark Young
Date: 12:03:06 08/18/00
Go up one level in this thread
On August 18, 2000 at 14:08:18, James Thompson wrote: >On August 18, 2000 at 13:58:00, Mark Young wrote: > >>On August 18, 2000 at 13:33:10, James Thompson wrote: >> >>>In an earlier post the following position was proposed: >>> >>>[D] kbb2rr1/1p6/p3p1q1/PN1pB3/1n6/R3Q3/5PB1/6K1 w - - >>> >>>Varoius responses indicated some pretty rapid solution times for various >>>programs: some as short as 8 seconds. When I set up this position for Fritz6a, >>>I left the computer running overnight and it still had not found the solution >>>mate in 8 beginning with 1.Qa7+. I used the normal settings for mate analysis >>>in the Fritz program. Any idea why Fritz could locate the mate? I must admit I >>>was surprised and disappointed when my "number 1" rated program could not find >>>the solution and others could. :( >>> >>>James >> >>You have something setup wrong, this position is a no brainer for just about any >>chess program. >> > >You may be right but I can't seem to determine where I might have setup >problems. Fritz finds the solution in the "infinite analysis" mode almost >immediately but in the "mate search" mode it runs forever. What's the >difference between these modes and how does it affect Fritz's performance? > >James Mate 2.0 is not the Fritz 6a engine, and since it is a mate in 8 it will take the mate 2.0 engine a very long time to find it. Mate 2.0 looks for the shortest mate and all mating lines that are the shortest mate. If you use Fritz 5.16 as the mate search engine you can feed Fritz 5.16 lots of ram, then Fritz 5.16 can find the winning line in a vary short time. Mating line found by Fritz 5.16 running as a mate search engine. 1.Qa7+ Bxa7 2.Nc7+ Kb8 3.Nxa6+ Ka8 4.Nc7+ Kb8 5.Nxd5+ Ka8 6.Nb6+ Bxb6 7.axb6+ Na6+ 8.Rxa6 Line
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