Author: Will Singleton
Date: 11:53:20 11/07/00
Go up one level in this thread
On November 07, 2000 at 11:16:06, kurt wrote: >On November 06, 2000 at 23:37:43, Paulo Soares wrote: > >>On November 06, 2000 at 21:49:09, Will Singleton wrote: >> >>>From the game Amateur-ZChess, bm Rfc1? if so, does your engine see why? >>> >>>[D]r5k1/p5bp/4p1p1/2Nb1r2/2pP2Q1/q3B3/P4PPP/1R3RK1 w - - >> >>Did Century 3.0 understand the position? I admit that I didn't understand, >>although I have not analyzed for a long time. >>PIII-450, HT=100Mb >> >>Paulo >> >> >>Thinking.... >> >> +---+---+---+---+---+---+---+---+ New position - >>8 | *R| | | | | | *K| | >> +---+---+---+---+---+---+---+---+ 00:00:00 00:00:00 >>7 | *p| | | | | | *B| *p| >> +---+---+---+---+---+---+---+---+ >>6 | | | | | *p| | *p| | Time infinite >> +---+---+---+---+---+---+---+---+ Hash 100 Mb >>5 | | | N | *B| | *R| | | Engine Rebel Century 3.0 >> +---+---+---+---+---+---+---+---+ Personality Rebel Century 3 >>4 | | | *p| p | | | Q | | anti-GM Off >> +---+---+---+---+---+---+---+---+ Tactics Off >>3 | *Q| | | | B | | | | Bluff Chess Off >> +---+---+---+---+---+---+---+---+ Style Normal >>2 | p | | | | | p | p | p | Strength Strongest >> +---+---+---+---+---+---+---+---+ Search Normal Search >>1 | | R | | | | R | K | | >> +---+---+---+---+---+---+---+---+ >> a b c d e f g h >> >>r5k1/p5bp/4p1p1/2Nb1r2/2pP2Q1/q3B3/P4PPP/1R3RK1 w - - >> >>[Event "?"] >>[Site "?"] >>[Date "??.??.????"] >>[Round "?"] >>[White "New position"] >>[Black ""] >>[Result "*"] >>[WhiteElo "?"] >>[BlackElo "?"] >>[FEN "r5k1/p5bp/4p1p1/2Nb1r2/2pP2Q1/q3B3/P4PPP/1R3RK1 w - - 0 1"] >> >>1.* >> >>00:00:00 1.00 -2.75 1.Rb7 Bxb7 2.Nxb7 Qxa2 >>00:00:00 1.06 -1.26 1.Rbe1 Qxa2 >>00:00:00 1.08 -1.20 1.Rbc1 Qxa2 >>00:00:00 1.11 -1.13 1.Rfd1 Qxa2 >>00:00:00 1.12 -1.03 1.Rfe1 Qxa2 >>00:00:00 1.18 -1.01 1.Bf4 Bxd4 >>00:00:00 1.19 -0.67 1.Ra1 >>00:00:00 1.26 -0.28 1.Qe2 >>00:00:00 2.00 -0.40 1.Qe2 Raf8 >>00:00:00 3.00 -0.41 1.Qe2 e5 2.dxe5 Bxe5 >>00:00:00 4.00 -0.50 1.Qe2 c3 2.Rfe1 Qxa2 3.Qxa2 >>00:00:00 5.00 -0.39 1.Qe2 e5 2.dxe5 Rxe5 3.Nd7 Ree8 >>00:00:01 6.00 -0.47 1.Qe2 c3 2.Rfe1 Qxa2 3.Qxa2 Bxa2 >> 4.Rb7 (0) >> >>00:00:03 7.00 -0.51 1.Qe2 e5 2.dxe5 Rxe5 3.Rfe1 Rc8 >> 4.Rb5 Rce8 (1) >> >>00:00:05 8.00 -0.61 1.Qe2 e5 2.dxe5 Rxe5 3.Qd2 c3 4.Qc1 >> Qa5 5.Rd1 Bxa2 (3) >> >>00:00:14 9.00 -0.63 1.Qe2 e5 2.dxe5 Rxe5 3.Rfd1 Qxc5 >> 4.Bxc5 Rxe2 5.Rxd5 Rxa2 (10) >> >>00:00:34 10.00 -0.81 1.Qe2 e5 2.dxe5 Rxe5 3.Rbd1 Rae8 >> 4.Qd2 c3 5.Qc1 Qb4 (24) >> >>00:00:50 10.01 -0.78 1.Qg3 Qxa2 2.Ra1 Qe2 3.Rfe1 Qb2 >> 4.Reb1 Qc2 5.Rc1 Qb2 6.Rcb1 Qc2 >> 7.Rc1 Qb2 (34) >> >>00:02:03 10.05 -0.71 1.Ra1 Rb8 2.Bc1 Qc3 3.Be3 Qb2 4.Rfc1 >> e5 5.Na4 Qb4 (60) >> >>00:02:17 10.07 -0.60 1.Rfe1 Qxa2 2.Ra1 Qb2 3.Reb1 Qc3 >> 4.Ra6 e5 5.Ne4 Bxe4 6.Qxe4 (125) >> >>00:08:14 11.00 -0.52 1.Rfe1 Rc8 2.Qh4 e5 3.Nd7 c3 4.dxe5 >> Bxe5 5.Nxe5 c2 6.Rbc1 (144) >> >>00:12:05 11.17 -0.52 1.Rfc1 >>00:13:21 11.17 -0.34 1.Rfc1 e5 2.dxe5 Bxe5 3.Rxc4 Qxa2 >> 4.Rcc1 Re8 5.Kh1 Rh5 6.h3 Rf5 (725) >> >>00:22:02 12.00 -0.36 1.Rfc1 Rd8 >> >>Positions : 224.195.669 >>Nodes per second : 167.435 >> >>Extensions (checks) : 6.060.966 (2%) >>Extensions (captures) : 1.966.351 (0%) >>Extensions (king safety) : 26.189 (0%) >>Extensions (on depth) : 0 (0%) >>Extensions (remaining) : 135.843 (0%) >>Extensions (total) : 8.189.349 (3%) >> >>Hash Table : 1.812.560 1.974.505 (99%) >>Average depth : 12 >>Deepest depth : 43 >> >>The reason why Rfc1 is quite logical. >>1.Computer sees Pawn loss on a2. >>2.Can not find a defencive move for it. >>3.Accepts loss and searches for continuation after the loss of pawn. >>4.Finds Queen trap after Qa2 Rba1.Qb2 Rfb1 would force a draw. >>5.Evaluation of other line comparision gives Rfc1! >>regards,Kurt Widmann [ kurt, I don't understand how you can post an original message with quotes. How do you do that, and why? ] You are right. My thinking was that Rfc1 would, in most cases (read, Amateur programs with about 40 seconds to move) cause black to take the a2 pawn with the Queen, thus allowing white to force the perpetual. As it turns out, crafty and rebel both like Rfc1 because it saves the a2 pawn with a better resulting position than you get from Qe2. But my original just concerned the idea of finding the rep draw. I guess it would be interesting to see how many programs (non-commercial) would avoid Qxa2 after Rfc1. Will
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