Author: Dieter Buerssner
Date: 14:03:11 03/17/01
Go up one level in this thread
On March 17, 2001 at 12:21:45, Sune Larsson wrote:
> 8/2R5/k7/P7/2PK4/8/1P2r3/8 w - - 0 1
>
>
> This position was sent to me just two hours ago (thanks!)
> White has a won position but must avoid the last trap,
> which is 1.b4?? and a draw. The programs I have tried
> sees this but in different speed. (PIII 800)
>
> Deep Fritz 0 sec
> Nimzo 8 2 "
> Hiarcs 7.32 2 "
> Crafty 18.03 20 "
> Fritz 5.32 48 "
>
>
> Test: 1) Does your program realize that 1.b4?? is a draw?
> 2) How much time needed?
About 2 seconds for Yace on AMD K6-2 475:
nodes time score depth
185932 1.921 3.52 9. 1.b4 Re4+ 2.Kd3 Re3+ 3.Kd2 Rd3+ 4.Ke2 Re3+
5.Kd1 Re1+ 6.Kd2 Re2+ 7.Kc1 Rc2+ 8.Kd1 Rd2+
9.Ke1 Re2+ 10.Kf1 Rf2+ 11.Kg1 Rg2+ 12.Kh1 Rh2+
13.Kg1
206431 2.073 3.12 10-- 1.b4 Re4+ 2.Kd3 Re3+ 3.Kd2 Rd3+ 4.Kc1 Rd1+
5.Kb2 Rb1+ 6.Kc3 Rxb4 7.Rc6+ Kxa5 8.Rc7 Rb1
9.Kd4 {80}
237449 2.289 0.00 10t 1.b4 Re4+ 2.Kd3 Re3+ 3.Kd2 Rd3+ 4.Kc1 Rd1+
5.Kb2 Rd2+ 6.Kb1 Rb2+ 7.Kc1 Rc2+ 8.Kb1 Rb2+
9.Kxb2H {740}
244630 2.350 0.01 10t+ 1.b3 Kxa5
463424 3.636 2.59 10t 1.b3 Kxa5 2.Rc5+ Kb6 3.b4 Rd2+ 4.Kc3 Rd1 5.Rb5+
Kc6 6.Re5 Kd6 7.Re2 {160}
855351 5.929 2.60 10t+ 1.Rc6+ Kxa5 2.Rc5+ Ka6 3.b4 Ka7
1191726 7.996 2.60 10t 1.Rc6+ Kxa5 2.Rc5+ Ka4H 3.Rc8H Rg2H 4.Ra8+H
Kb3H 5.Rb8+H Kc2H 6.b4H Rg4+H 7.Kd5H Kd3H 8.c5H
Rd4+H 9.Kc6H Ke4H {160}
1227437 8.232 2.61 10t+ 1.Kc3 Kxa5 2.b4+ Ka6
1581185 10.535 2.63 10t 1.Kc3 Kxa5 2.b4+ Kb6 3.Rd7 Re6 4.Rd2 Kc6 5.Kb3
Rd6H 6.Rc2H Rd4H {160}
1586894 10.583 2.63 10. 1.Kc3 Kxa5 2.b4+ Kb6 3.Rd7 Re6 4.Rd2 Kc6 5.Kb3
Rd6 6.Rc2 Rd4 {160}
-- Dieter
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