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Subject: Re: Crafty Bug?

Author: John Merlino

Date: 12:26:43 08/14/02

Go up one level in this thread


On August 14, 2002 at 01:01:57, Slater Wold wrote:

>White(1): setboard 8/8/3pR1P1/2k5/8/1p1b4/7K/8 b - - 0 67
>Black(1): go
>end-game phase
>              clearing hash tables
>              time surplus   0.00  time limit 3:00 (3:00)
>         nss  depth   time  score   variation (1)
>starting thread 1
>         (4)    8->   0.39   0.01   1. ... Bxg6 2. Rxg6 <HT>
>         (3)    9     0.48   0.01   1. ... Bxg6 2. Rxg6 <HT>
>         (4)    9->   0.73   0.01   1. ... Bxg6 2. Rxg6 <HT>
>         (3)   10     0.97   0.01   1. ... Bxg6 2. Rxg6 <HT>
>         (4)   10->   1.67   0.01   1. ... Bxg6 2. Rxg6 <HT>
>         (3)   11     1.70   0.01   1. ... Bxg6 2. Rxg6 <HT>
>         (4)   11->   3.55   0.01   1. ... Bxg6 2. Rxg6 <HT>
>         (3)   12     3.55   0.01   1. ... Bxg6 2. Rxg6 <HT>
>         (4)   12->   7.45   0.01   1. ... Bxg6 2. Rxg6 <HT>
>         (3)   13     7.53   0.01   1. ... Bxg6 2. Rxg6 <HT>
>               13    21.12     ++   1. ... b2!!
>               13->   2:49  -0.38   1. ... b26
>              time=3:00  cpu=307%  mat=1  n=242037717  fh=94%  nps=1342k
>              ext-> chk=29936339 cap=78644 pp=227271 1rep=1144737 mate=32723
>              predicted=0  nodes=242037717  evals=21110434
>              endgame tablebase-> probes done=239240  successful=53187
>              SMP->  split=778  stop=81  data=9/32  cpu=9:13  elap=3:00
>
>Black(1): b2
>              time used:   3:00
>
>#1 - You should see b2 wins pretty much immediatly.  Sure, 21.12 seconds isn't
>bad, but imagine this on a PIII 600!  -0.38 isn't very convincing either.
>
>#2 - What's up with 13->   2:49  -0.38   1. ... b26  <//==- that?
>
>#3 - Any reason you can see why Crafty would take *forver* (even after this
>move) to see the win?

Chessmaster 9000, on a PIII-600, does not see a win until 3:24....

Time	Depth	Score	Positions	Moves
0:00	1/3	-0.25	1037		67...Bf5 68.Rf6 Bc2 69.g7
0:00	1/3	-0.47	1337		67...b2 68.g7 Bh7 69.Re1 Kd4
0:00	1/4	-0.30	2607		67...b2 68.g7 Bh7 69.Re1 Kd4 70.Rg1
0:00	1/5	-0.30	12269		67...b2 68.g7 Bh7 69.Re1 Kd4 70.Rg1
0:00	2/6	-0.30	28052		67...b2 68.g7 Bh7 69.Re1 Kd4 70.Rg1
					Kc3
0:01	3/7	-0.49	86892		67...b2 68.g7 Bh7 69.Re1 Kc4 70.Rg1
					d5 71.Kh3 Kc3
0:02	4/8	0.03	179397		67...b2 68.g7 Bh7 69.Re1 Kc4 70.Kg3
					Kd3 71.Rh1 Bg8 72.Rd1+ Kc2
0:03	4/8	0.00	238744		67...Bc4 68.Re1 Kb4 69.g7 b2 70.Rg1
					Kc3 71.Rg3+ Kc2 72.Rg2+ Kc3 73.Rg3+
0:05	5/9	0.00	375278		67...Bc4 68.Re1 Kb4 69.g7 b2 70.Rg1
					Kc3 71.Rg3+ Kc2 72.Rg2+ Kc3 73.Rg3+
0:05	5/9	-0.34	447584		67...b2 68.g7 Bh7 69.Re1 Kc4 70.Kg3
					Kc3 71.Rh1 Bg8 72.Rd1 Ba2
0:09	6/10	-0.30	746851		67...b2 68.g7 Bh7 69.Re1 Kc4 70.Kg3
					Kc3 71.Kf4 Kc2 72.Re2+ Kb3 73.Re3+
					Ka2
0:22	7/11	-0.31	1799613		67...b2 68.g7 Bh7 69.Re1 Kc4 70.Kg3
					Kc3 71.Kf4 Kc2 72.Re2+ Kb3 73.Re1
					Ka2
1:09	8/12	-0.07	5626270		67...b2 68.g7 Bh7 69.Re1 Kc4 70.Kg3
					Kc3 71.Rh1 Bg8 72.Kf4 Ba2 73.Rg1
					Kd3
3:24	9/13	-1.38	16983375	67...b2 68.g7 Bh7 69.Re1 Kc4 70.Kg3
					Bg8 71.Kf4 Kb3 72.Kg5 Ka2 73.Kf6
					b1=Q 74.Rxb1 Kxb1
15:56	10/14	-1.56	80606591	67...b2 68.g7 Bh7 69.Re1 Kc4 70.Kg3
					Bg8 71.Kf4 Kb3 72.Kg5 Ka2 73.Re7
					b1=Q 74.Ra7+ Kb3 75.Rb7+ Kc2 76.Rxb1
					Kxb1

jm



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