Author: Dann Corbit
Date: 17:23:39 08/16/01
Go up one level in this thread
On August 16, 2001 at 20:21:55, Peter McKenzie wrote: >On August 16, 2001 at 17:56:58, Dann Corbit wrote: > >>On August 16, 2001 at 17:51:05, Roy Eassa wrote: >> >>>On August 16, 2001 at 15:50:28, Dann Corbit wrote: >>> >>>>On August 16, 2001 at 15:42:51, Frank Phillips wrote: >>>> >>>>>Mine takes forever and 12 ply to see the trouble, even if I turn up the open >>>>>h-file with rook (queen) on it king safety term. >>>>> >>>>>Do the programs that solve this quickly do it by shear speed, evaluation or >>>>>clever extensions? >>>> >>>>Phalanx solves it very fast. >>>>Phalanx searches less than 150K NPS on my 950 MHz machine. >>>>It has very clever search extensions. >>>>It has very clever king saftety. >>>> >>>>So darn clever (in fact) I have a hard time figuring out what is going on, >>>>despite having the source code at my disposal. >>> >>> >>>Phalanx, eh? How has it done in tournaments vs. the other engines? If not so >>>good, what weakness(es) does it have to offset these strengths? >> >>It finished about the center of the pile in "The Battle of the Crowns" chess >>tournament in the 4 crown division. (This was over a year ago, and many of the >>program versions are now outdated). >> >> Program Score % Av.Op. Elo + - Draws >> 1 LGoliath : 37.0/ 52 71.2 2289 2445 76 99 26.9 % >> 2 Crafty : 32.0/ 52 61.5 2294 2376 85 77 34.6 % >> 3 AnMon : 31.5/ 52 60.6 2294 2369 86 83 28.8 % >> 4 Amy : 28.5/ 52 54.8 2297 2331 93 85 21.2 % >> 5 SOS : 28.0/ 52 53.8 2298 2325 94 82 23.1 % >> 6 Bringer : 27.5/ 52 52.9 2298 2318 96 72 32.7 % >> 7 TCBishop : 27.0/ 52 51.9 2299 2312 97 73 30.8 % >> 8 Phalanx : 26.5/ 52 51.0 2299 2306 99 74 28.8 % >> 9 Comet : 24.5/ 52 47.1 2301 2281 62 96 44.2 % >> 10 Gromit3 : 24.5/ 52 47.1 2301 2281 79 96 25.0 % >> 11 Gromit2 : 21.5/ 52 41.3 2304 2243 89 88 21.2 % >> 12 Francesca : 18.5/ 52 35.6 2307 2204 102 82 17.3 % >> 13 Yace : 18.5/ 52 35.6 2307 2204 87 82 28.8 % >> 14 ZChess : 18.5/ 52 35.6 2307 2204 108 82 13.5 % >> >>The engine is 150K NPS on a very fast machine. Other engines are much faster >>and get one or two full plies deeper at every turn. >> >>Attach a really fast motor, and Phalanx might rule the world. > >If it had a really fast motor, maybe it wouldn't have time to do the fancy >extensions and fancy king safety stuff? Well, good point. I really don't know where the brakes are in the system, since I have not done careful profiles. But I suspect the move generator. Most engines develop 3-4x the NPS of Phalanx on my machine. Maybe the darned clever search and all the fancy eval stuff is the reason for that. But I ?suspect? not.
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