Author: Richard A. Fowell (fowell@netcom.com)
Date: 13:46:38 12/23/99
Go up one level in this thread
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. Ply/Mov# Time Nodes Score PV =============================================================================== 06/01|00:00:05| 664583| +468| Qe6 Rge1 Qxb3 Qd2 Rxh2+ Kg1 Rxd2 axb3 Ne2+ Kf2 Nxd4+ 07/01|00:00:07| 1042302| +473| Qe6 Qe5 Rxh2+ Ke1 Re2+ Kd1 Rxe5 dxe5 Qd5+ Nd2 Qxe5 08/01|00:00:15| 2194309| +478| Qe6 Qe5 Rxh2+ Ke1 Re2+ Kd1 Rxe5 dxe5 Qxe5 Rg2 Nf5 08/06|00:00:54| 8129105| +555| Ne4+ fxe4 Qe3+ Kf1 Qf3+ Ke1 Qxe4+ Kf1 Qf3+ Ke1 Re8+ Qe5 Rxe5+ dxe5 Rxh2 Rxg7+ Kxg7 Nd4 09/01|00:02:51| 26287433| +768| Ne4+ fxe4 Qe3+ Kf1 Qf3+ Ke1 Qxe4+ Kf1 Qf3+ Ke1 Re8+ Qe5 Rxe5+ dxe5 Rxh2 Rg2 Rh1+ Kd2 Qxg2+ Kc3 Rxa1 Nxa1 10/01|00:10:20| 96423720|+M11 | Ne4+ fxe4 Qe3+ Kf1 Qf3+ Ke1 Qxe4+ Kf1 Qd3+ Ke1 Re8+ Qe5 Rxe5+ dxe5 Rxh2 Rxg7+ Kxg7 Nc1 Rh1+ Kf2 Qf1+ 11/01|00:40:30| 386787104|+M11 | Ne4+ fxe4 Qe3+ Kf1 Qf3+ Ke1 Qxe4+ Kf1 Qd3+ Ke1 Re8+ Qe5 Rxe5+ dxe5 Rxh2 Rxg7+ Kxg7 Nc1 Rh1+ Kf2 Qf1+ 12/01|01:47:44| 1035871766|+M9 | Ne4+ fxe4 Qe3+ Kf1 Rxh2 Rxg7+ Kxg7 Qe5+ f6 Qe7+ Kg6 Qxf6+ Kxf6 e5+ Kg5 Nd2 Qf2+ Thursday, December 23, 1999 1:32 PM
This page took 0 seconds to execute
Last modified: Thu, 15 Apr 21 08:11:13 -0700
Current Computer Chess Club Forums at Talkchess. This site by Sean Mintz.