Author: Ed Schröder
Date: 15:40:07 03/22/01
Go up one level in this thread
On March 22, 2001 at 17:55:07, Derek Mauro wrote: >I'm no expert on computer chess, but I thought I'd call this to everyone's >attention. I was analyzing one of my recent games with Tiger (reg. and gambit), >and had a drawn position(I had black). > >[D]8/8/8/8/1n6/2K5/p7/6k1 w - - 0 111 > >For some reason, in the obvious draw, Tiger gives it -12 and wants to play >Kxb4?? even after like 20 minutes. All the programs seem to think its about -6 >or so, but they all play the correct move, the obvious Kb2. Is this a bug? >(The 4 piece tablebases will easily solve this bug, but this position is so >incredibly easy that I can't see why it would even need them.) It is funny how Rebel handles this position, 60 plies (its absolute maximum) within 1.5 minutes! 00:00:46 54.00 -4.97 1.Kb2 Kf2 2.Ka1 Ke3 3.Kb2 Kd4 4.Ka1 Ke5 5.Kb2 Ke4 6.Ka1 Kf4 7.Kb2 Kf5 8.Ka1 Ke4 9.Kb2 Kd5 10.Ka1 Kd4 11.Kb2 Kc4 12.Ka1 Kd3 [344589] 00:00:52 55.00 -5.15 1.Kb2 Kf2 2.Ka1 Ke3 3.Kb2 Kd4 4.Ka1 Ke5 5.Kb2 Ke4 6.Ka1 Kf4 7.Kb2 Kf5 8.Ka1 Ke4 9.Kb2 Kd5 10.Ka1 Kd4 11.Kb2 Kc4 12.Ka1 Kd3 [356718] 00:00:58 56.00 -5.01 1.Kb2 Kf2 2.Ka1 Ke3 3.Kb2 Kd4 4.Ka1 Ke5 5.Kb2 Ke4 6.Ka1 Kf4 7.Kb2 Kf5 8.Ka1 Ke4 9.Kb2 Kd5 10.Ka1 Kd4 11.Kb2 Kc4 12.Ka1 Kd3 [364788] 00:01:05 57.00 -5.09 1.Kb2 Kf2 2.Ka1 Ke3 3.Kb2 Kd4 4.Ka1 Ke5 5.Kb2 Ke4 6.Ka1 Kf4 7.Kb2 Kf5 8.Ka1 Ke4 9.Kb2 Kd5 10.Ka1 Kd4 11.Kb2 Kc4 12.Ka1 Kd3 [369686] 00:01:12 58.00 -4.94 1.Kb2 Kf2 2.Ka1 Ke3 3.Kb2 Kd4 4.Ka1 Ke5 5.Kb2 Ke4 6.Ka1 Kf4 7.Kb2 Kf5 8.Ka1 Ke4 9.Kb2 Kd5 10.Ka1 Kd4 11.Kb2 Kc4 12.Ka1 Kd3 [378272] 00:01:20 59.00 -5.43 1.Kb2 Kf2 2.Ka1 Ke3 3.Kb2 Kd4 4.Ka1 Ke5 5.Kb2 Ke4 6.Ka1 Kf4 7.Kb2 Kf5 8.Ka1 Ke4 9.Kb2 Kd5 10.Ka1 Kd4 11.Kb2 Kc4 12.Ka1 Kd3 [380865] 00:01:27 60.00 -5.43 1.Kb2 Kf2 2.Ka1 Ke3 3.Kb2 Kd4 4.Ka1 Ke5 5.Kb2 Ke4 6.Ka1 Kf4 7.Kb2 Kf5 8.Ka1 Ke4 9.Kb2 Kd5 10.Ka1 Kd4 11.Kb2 Kc4 12.Ka1 Kd3 [382476] >This next position is also from the same game that all programs seem to have >trouble with, but I don't believe this is a bug. > >[D]8/1k6/2n5/8/6r1/p1K5/7R/8 b - - 0 87 > >Most programs want to play Nb4, but from there white can force a draw. I think >Ra4 is the correct move (Na5 might also work), but I'm not sure. I also fell to >the tempation of Nb4 during the game :( > >Derek It takes Rebel quite some time to change from Nb4 to Rg3+ but I wonder if is any better? Ed ========================= Loading... Engine version : Rebel Century 3.1 Hash table size : 60 Mb 8/1k6/2n5/8/6r1/p1K5/7R/8 b - - 00:00:00 04.00 4.50 1..Ra4 2.Kb3 Ra8 3.Ra2 Nd4 [6374] 00:00:01 06.00 4.49 1..Ra4 2.Kb3 Ra8 3.Ka2 Nb4 4.Ka1 a2 [60831] 00:00:01 07.00 4.33 1..Ra4 2.Kb3 Ra5 3.Ra2 Nd4 4.Kc4 Nb5 [165126] 00:00:03 08.00 4.35 1..Ra4 2.Kb3 Ra5 3.Ka2 Nb4 4.Ka1 Nd5 5.Rh3 [209641] 00:00:05 08.23 4.45 1..Na5 2.Ra2 Rc4 3.Kd3 Ra4 4.Ke3 Nc4 5.Kd4 Kc6 6.Ra1 [278279] 00:00:05 09.00 4.49 1..Na5 2.Ra2 Rc4 3.Kd3 Ra4 4.Kc3 Kc6 5.Kd3 Nc4 6.Ke4 [317139] 00:00:10 10.00 4.55 1..Na5 2.Ra2 Ra4 3.Kc2 Kc6 4.Ra1 Kd5 5.Rd1 Ke5 6.Kd2 [432464] 00:00:12 10.02 4.55 1..Nb4 [446072] 00:00:12 10.02 4.66 1..Nb4 2.Kb3 a2 3.Rh7 Kc6 4.Rh6 Kd5 5.Rh5 Ke4 6.Rh1 Kd5 7.Rd1 Ke6 8.Re1 Kf5 9.Rf1 Rf4 10.Ra1 Nd3 [472895] 00:00:29 11.00 4.84 1..Nb4 2.Kb3 a2 3.Rh1 Kc6 4.Kb2 Rg2 5.Ka1 Kd5 6.Rh5 Kd4 7.Rh4 Kc3 8.Rh1 Kd4 9.Rh4 Kc3 10.Rh1 Kd4 [528892] 00:01:27 12.00 4.84 1..Nb4 2.Rh1 a2 3.Kb2 Ka6 4.Rh6 [540847] 00:02:51 12.06 4.84 1..Rg3+ [516573] 00:04:34 12.06 4.99 1..Rg3+ 2.Kc4 Kb6 3.Ra2 Rf3 4.Rh2 [519313]
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