Author: Ralph Stoesser
Date: 15:29:40 07/08/03
Go up one level in this thread
On July 08, 2003 at 17:33:27, Alessandro Damiani wrote: >On July 08, 2003 at 10:40:28, Uri Blass wrote: > >>On July 08, 2003 at 10:28:55, Djordje Vidanovic wrote: >> >>>On July 07, 2003 at 16:47:09, Uri Blass wrote: >>> >>>>On July 07, 2003 at 16:44:28, Djordje Vidanovic wrote: >>>> >>>>>Here's the clip from the newest Ruffian engine: >>>>> >>>>>New game >>>>>4rqn1/p3brk1/R5p1/6Bp/1p5Q/1B1R4/PPP2PPP/6K1 w - - 0 1 >>>>> >>>>>Analysis by Ruffian 2003-06-23: >>>>> >>>>>1.Rxg6+ Kxg6 2.Rh3 Bxg5 3.Qxh5+ Kf5 4.Rf3+ Ke5 5.Rxf7 Qh6 6.Qe2+ Be3 7.fxe3 >>>>> +- (7.53) Depth: 1/7 00:00:00 >>>>>1.Rxg6+ Kxg6 2.Rh3 Bxg5 3.Qxh5+ Kf5 4.Rf3+ Ke5 5.Rxf7 Qh6 6.Qe2+ Be3 7.fxe3 >>>>> +- (7.53) Depth: 1/7 00:00:00 >>>>>1.Rxg6+ Kxg6 2.Rh3 Bxg5 3.Qxh5+ Kf5 4.Rf3+ Ke5 5.Rxf7 Qh6 6.Qe2+ Be3 7.fxe3 >>>>> +- (7.53) Depth: 2/7 00:00:00 >>>>>1.Rxg6+ Kxg6 2.Rh3 Bxg5 3.Qxh5+ Kf5 4.Rf3+ Ke5 5.Rxf7 Qh6 6.Qe2+ Be3 7.fxe3 >>>>> +- (7.53) Depth: 3/10 00:00:00 >>>>>1.Rxg6+ Kxg6 2.Rh3 Bxg5 3.Qxh5+ Kf5 4.Rf3+ Ke5 5.Rxf7 Qh6 6.Qe2+ Be3 7.fxe3 >>>>> +- (7.53) Depth: 4/10 00:00:00 >>>>>1.Rxg6+ Kxg6 2.Rh3 Bxg5 3.Qxh5+ Kf5 4.Rf3+ Ke5 5.Rxf7 Qh6 6.Qe2+ Be3 7.fxe3 >>>>> +- (7.53) Depth: 5/11 00:00:00 >>>>>1.Rxg6+ Kxg6 2.Rh3 Bxg5 3.Qxh5+ Kf5 4.Rf3+ Ke5 5.Rxf7 Qh6 6.Qe2+ Be3 7.fxe3 >>>>> +- (7.53) Depth: 6/13 00:00:00 16kN >>>>>1.Rxg6+ Kxg6 2.Rh3 Bxg5 3.Qxh5+ Kf5 4.Rf3+ Ke5 5.Rxf7 Qh6 6.Qe2+ Be3 7.fxe3 >>>>> +- (7.53) Depth: 7/17 00:00:00 86kN >>>>>1.Rxg6+ Kxg6 2.Rh3 Bxg5 3.Qxh5+ Kf5 4.Rf3+ Ke5 5.Rxf7 Qh6 6.Qe2+ Be3 7.fxe3 >>>>> +- (7.53) Depth: 8/20 00:00:00 202kN >>>>>1.Rxg6+ Kxg6 2.Rh3 Bxg5 3.Qxh5+ Kf5 4.Rf3+ Ke5 5.Rxf7 Qh6 6.Qe2+ Be3 7.fxe3 >>>>> +- (7.53) Depth: 9/20 00:00:00 448kN >>>> >>>>I suspect that it learned from previous analysis. >>>>The line and the score was not changed from depth 1. >>>> >>>>Uri >>> >>> >>>Which previous analysis? I just copied the fen into Ruffian and let him >>>analyse. No previous analysis. Wrong suspicion :) Ruffian is a very smart >>>program... >>> >>>Djordje >> >>It does not make sense that a program has a pv of 13 plies at depth 1 when the >>pv and the score are unchanged until depth 9 except number of nodes. >> > >It is possible due to extensions. At depth 1 the PV is extended 13 plies deep. Doesn't mean the "7" from "Depth: 1/7" that it extended 7 plies only? >The following iterations can produce the same pv and therefore the same score if >the extensions at depth 1 already produced the best sequence of moves up to ply >13. > >This behaviour happens also with a simple full-width search followed by a >capture search: if at the horizon of the full-width search - on the pv - a >capture is forced, the next iteration will have the same pv with the same depth >and score. > >Rgds, >Alessandro
This page took 0.22 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.