Author: Tim Foden
Date: 01:08:31 01/22/02
Go up one level in this thread
On January 22, 2002 at 02:55:40, David Rasmussen wrote:
>[D]8/r7/8/p2k4/R3p1K1/8/8/8 b - - 0 67
>
>Can your program find Kc5! (there maybe other winning moves, like Kc6), and can
>it specifically avoid Ke5, which only draws? In other words, I don't know all
>the moves that wins and all the moves that draws, but can your program find a
>winning move without tablebases, and even understand what is going on?
Green Light sticks with Ke5 until 8m33s, where it gets a fail high for Kc5. It
takes 20 mins to resolve the fail high. Even then it doesn't get the same
principle variation as Pepito-with-tablebases.
There isn't any special code for this, so I guess 21 ply is deep enough for GLC
to see the forced promotion.
Cheers, Tim.
GLC2.15d, 48MB hash, 920MHz Duron:
>anal
Game stage: Endgame
Current eval: 2.56
Ply Time Score Nodes Principal Variation
3 0.02 2/15 Rc7 >
5 0.47 +2.570 5418 Ke5 68. Kg3 Ra8 69. Kf2 Ra7
5 0.47 +2.570 5418 Ke5 68. Kg3 Ra8 69. Kf2 Ra7
6 0.48 +2.560 7338 Ke5 68. Kg3 Ra6 69. Kf2 Rf6+ 70. Ke2 Ra6
6 0.49 +2.560 10517 Ke5 68. Kg3 Ra6 69. Kf2 Rf6+ 70. Ke2 Ra6
7 0.49 +2.633 13867 Ke5 68. Kg3 Ra6 69. Kf2 Kf4 70. Ke2 Ra7
7 0.51 +2.633 17840 Ke5 68. Kg3 Ra6 69. Kf2 Kf4 70. Ke2 Ra7
8 0.52 +2.633 23494 Ke5 68. Kg3 Ra6 69. Kf2 Kf4 70. Ke2 Ra7 71. Kd2
8 0.53 +2.633 30180 Ke5 68. Kg3 Ra6 69. Kf2 Kf4 70. Ke2 Ra7 71. Kd2
9 0.55 +2.633 40561 Ke5 68. Kg3 Ra6 69. Kg4 Ra8 70. Kg3 Ra7 {ht}
9 0.57 +2.633 48112 Ke5 68. Kg3 Ra6 69. Kg4 Ra8 70. Kg3 Ra7 {ht}
10 0.59 +2.633 58775 Ke5 68. Kg3 Ra6 69. Kg4 Ra8 70. Kg3 Ra7 {ht}
10 0.61 +2.633 71688 Ke5 68. Kg3 Ra6 69. Kg4 Ra8 70. Kg3 Ra7 {ht}
11 0.65 +2.633 95432 Ke5 68. Kg3 Ra6 69. Kg4 Ra8 70. Kg3 Kf5 71. Kf2 Kf4
72. Ke2 Ra7
11 0.70 +2.633 122011 Ke5 68. Kg3 Ra6 69. Kg4 Ra8 70. Kg3 Kf5 71. Kf2 Kf4
72. Ke2 Ra7
12 0.82 +2.633 189371 Ke5 68. Kg3 Ra6 69. Kg4 Ra8 70. Kg3 Kf5 71. Kf2 Kf4
72. Ke1 Ra7 73. Kd2
12 1.05 +2.633 326679 Ke5 68. Kg3 Ra6 69. Kg4 Ra8 70. Kg3 Kf5 71. Kf2 Kf4
72. Ke1 Ra7 73. Kd2
13 1.16 +2.633 392201 Ke5 68. Kg3 Ra6 69. Kg4 Ra8 70. Kg3 Kf5 71. Kf2 Kf4
72. Kf1 Ra7 73. Ke2 Ra6 74. Kf2
13 1.96 +2.633 921913 Ke5 68. Kg3 Ra6 69. Kg4 Ra8 70. Kg3 Kf5 71. Kf2 Kf4
72. Kf1 Ra7 73. Ke2 Ra6 74. Kf2
14 2.16 +2.633 1040673 Ke5 68. Kg3 Ra6 69. Kg4 Ra8 70. Kg3 Kf5 71. Kf2 Kf4
72. Kf1 Ra7 73. Ke2 Ra6 74. Kd2
14 3.32 +2.633 1804784 Ke5 68. Kg3 Ra6 69. Kg4 Ra8 70. Kg3 Kf5 71. Kf2 Kf4
72. Kf1 Ra7 73. Ke2 Ra6 74. Kd2
15 5.51 +2.643 3123539 Ke5 68. Kg3 Ra6 69. Kg4 Ra8 70. Kg3 Kf5 71. Kf2 Kf4
72. Ke2 Ra7 73. Kf2 Ra6 74. Ke2 {ht}
15 7.90 +2.643 4667109 Ke5 68. Kg3 Ra6 69. Kg4 Ra8 70. Kg3 Kf5 71. Kf2 Kf4
72. Ke2 Ra7 73. Kf2 Ra6 74. Ke2 {ht}
16 8.55 +2.643 5048918 Ke5 68. Kg3 Ra6 69. Kg4 Ra8 70. Kg3 Ra7 {ht}
16 11.35 +2.643 6923562 Ke5 68. Kg3 Ra6 69. Kg4 Ra8 70. Kg3 Ra7 {ht}
17 13.52 +2.643 8241858 Ke5 68. Kg3 Ra6 69. Kg4 Ra8 70. Kg3 Ra7 {ht}
17 19.43 +2.643 12128k Ke5 68. Kg3 Ra6 69. Kg4 Ra8 70. Kg3 Ra7 {ht}
18 31.31 +2.633 19750k Ke5 68. Kg3 Ra6 69. Kf2 Kf4 70. Ke2 Ra8 71. Kf2 Ra7
{ht}
18 49.41 +2.633 32037k Ke5 68. Kg3 Ra6 69. Kf2 Kf4 70. Ke2 Ra8 71. Kf2 Ra7
{ht}
19 59.51 +2.633 38421k Ke5 68. Kg3 Ra6 69. Kf2 Kf4 70. Ke2 Ra8 71. Kf2 Ra7
{ht}
19 1:09 +2.633 45070k Ke5 68. Kg3 Ra6 69. Kf2 Kf4 70. Ke2 Ra8 71. Kf2 Ra7
{ht}
20 1:22 +2.633 52898k Ke5 68. Kg3 Ra6 69. Kf2 Kf4 70. Ke2 Ra8 71. Kf2 Ra7
{ht}
20 1:39 +2.633 63494k Ke5 68. Kg3 Ra6 69. Kf2 Kf4 70. Ke2 Ra8 71. Kf2 Ra7
{ht}
21 1:58 +2.633 74870k Ke5 68. Kg3 Ra6 69. Kf2 Kf4 70. Ke2 Ra8 71. Kf2 Ra7
{ht}
21 8:33 ++ 311551k Kc5 (a=2.233 b=3.033 e=3.033)
21 20:22 +5.502 763680k Kc5 68. Kf4 Kb5 69. Rxe4 a4 70. Re5+ Kb4 71. Re4+
Kc3 72. Re3+ Kb2 73. Re2+ Kc1 74. Re1+ Kd2 75.
Ra1 a3 76. Ke4 Ra4+ 77. Ke5 a2 78. Kd5 Kc2 79.
Rf1 Ra7 80. Ra1 {ht}
21 20:36 +5.502 772235k Kc5 68. Kf4 Kb5 69. Rxe4 a4 70. Re5+ Kb4 71. Re4+
Kc3 72. Re3+ Kb2 73. Re2+ Kc1 74. Re1+ Kd2 75.
Ra1 a3 76. Ke4 Ra4+ 77. Ke5 a2 78. Kd5 Kc2 79.
Rf1 Ra7 80. Ra1 {ht}
22 22:46 0/15 Kc5 >exit
local: t=22:50 nps=627091.3 n=859397952 (39.9% / 60.1%) fh=84.6%
total: t=9:20:07 nps=731826.7 n=24594554195 draws=1405545
trans: probes=341424084 hits=192389677 (56.35%) draft=168749236 (49.43%)
tcuts: exact=81932 (0.02%) upper=95268695 (27.90%) lower=22258800 (6.52%)
tstor: exact=30090 (0.03%) upper=71063235 (64.80%) lower=38574555 (35.17%)
ext: check=55268487 recap=481382 ppush=4792016 1rep=396837 thrt=0
q-moves: gen=124941925 tested=106293727 made/un=84061209 max-dep=8
max eval diff: part-1=3.251 part-2=1.405
>
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