Author: Dann Corbit
Date: 12:16:33 12/27/99
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On December 23, 1999 at 16:46:38, Richard A. Fowell (fowell@netcom.com) wrote: >On December 22, 1999 at 14:10:56, Dann Corbit wrote: > >>Have a look at this tremendous checkmate Chest found from the famous 1924 New >>York Chess Club championship: >>2r3k1/5ppp/7r/Q7/3P1p2/1N3Pnq/PP3K1P/R5R1 b - - acd 10; acn 535351375; acs >>15279; bm Ne4+; ce 32750; dm 9; id "C.A.P. 812153"; pv Ne4+ fxe4 Qe3+ Kf1 Rxh2 >>Rxg7+ Kxg7 Qe5+ f6 Qe7+ Kg6 Qxf6+ Kxf6 e5+ Kg6 e6 Qf2#; >> >>I will be amazed if any general purpose program (or even most GM's) can find it. > >The freeware MacChess 5.01 finds the mate in 9 in 1 hr, 48 minutes on my 180 MHz >machine, at 12 ply, using a general purpose (not matefinder) algorithm. Of >course, like most programs, it finds and sticks with the key move early - 54 >seconds (not bad for a freeware program on a 180 MHz machine), and also finds a >longer mate (Mate in 11) earlier - at 10 minutes, 20 seconds. However, MacChess >was programmed to continue to try to improve its line, even if it has found a >mate, if it has time left on its clock (as does Crafty, per one of Dann's >comments). I've attached the log. Those interested in MacChess can view the home >page at: >http://members.aol.com/macchess >Downloading it will be of little use to those without Macintoshes, but there is >plenty of information (including the manual and screenshots) online for those >who are interested - maybe you have Mac-owning friends who might be interested. That's really pretty amazing. None of my commercial or freeware programs could find it. MacChess 5.01 gets the blue ribbon for ability to refine a checkmate. ;-)
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