Author: Tim Foden
Date: 14:50:18 03/11/01
Go up one level in this thread
On March 11, 2001 at 16:47:14, leonid wrote:
>Hi!
>
>If you like to solve one mate then try this:
>
>[D]1nrkrnR1/Pbqnq2Q/nnQb1nnN/B1nNQ3/6Q1/7B/3R4/1K3Q2 w - -
>
>Please, indicate your result.
>
>Probably you will find that this position is very easely solvable by selective
>search but brute force search could be slow. My program took already 1 minute to
>see only 4 moves deep.
Hi Leonid,
Green Light Chess 2.13 sees a mate in 6 after almost 52 seconds. It sees a
couple of longer mates a lot earlier than this though.
Cheers, Tim.
Analysis, GLC 2.13, Duron 920MHz, 48MB hash:
Game stage: Opening
Current eval: 12.29
Ply Time Score Nodes Principal Variation
2 0.03 -- 11565 axb8=Q (a=16.12 b=17.12 e=16.12)
2 0.03 12.73 11738 axb8=Q Ndxe5
2 0.06 14.84 17505 Qexe7+ Rxe7 Qxe7+ Bxe7 Nf7+ Ke8 Nxc7+ Nxc7
2 0.06 14.84 20500 Qexe7+ Rxe7 Qxe7+ Bxe7 Nf7+ Ke8 Nxc7+ Nxc7
3 0.11 14.84 33886 Qexe7+ Rxe7 Qxe7+ Bxe7 Nf7+ Ke8 Nxc7+ Nxc7 axb8=Q
3 0.40 14.84 145913 Qexe7+ Rxe7 Qxe7+ Bxe7 Nf7+ Ke8 Nxc7+ Nxc7 axb8=Q
4 0.54 14.84 235962 Qexe7+ Rxe7 Qxe7+ Bxe7 Nf7+ Ke8 Nxc7+ Nxc7 axb8=Q
Bxc6
4 1.47 14.84 688186 Qexe7+ Rxe7 Qxe7+ Bxe7 Nf7+ Ke8 Nxc7+ Nxc7 axb8=Q
Bxc6
5 1.62 ++ 775518 Qexe7+ (a=14.34 b=15.34 e=15.34)
5 2.02 21.62 1067523 Qexe7+ Rxe7 Qxe7+ Bxe7 Nf7+ Ke8 Nxf6+ Bxf6 Nd6+ Qxd6
Qxg6+ Kd8 Bxb6+ Nc7 Qxd6
5 4.17 21.62 2511514 Qexe7+ Rxe7 Qxe7+ Bxe7 Nf7+ Ke8 Nxf6+ Bxf6 Nd6+ Qxd6
Qxg6+ Kd8 Bxb6+ Nc7 Qxd6
6 4.21 ++ 2532468 Qexe7+ (a=21.12 b=22.12 e=22.12)
6 5.02 320.85 3345261 Qexe7+ Rxe7 Qxe7+ Bxe7 Nf7+ Ke8 Nxf6+ Kxf7 Qfc4+
Nxc4 Qxc4+ Nce6 Q4xe6+ Nxe6 Qxe6# <ht>
6 10.58 320.85 8569308 Qexe7+ Rxe7 Qxe7+ Bxe7 Nf7+ Ke8 Nxf6+ Kxf7 Qfc4+
Nxc4 Qxc4+ Nce6 Q4xe6+ Nxe6 Qxe6# <ht>
7 23.60 320.87 22058k Qexe7+ Rxe7 Qgxg6 Qxc6 Rxf8+ Nxf8 Nf7+ Rxf7 Qfxf6+
Be7 Qxe7+ Rxe7 Qxe7# <ht>
7 51.64 320.89 50116k Qfxf6 Ngxe5 Rxf8 Nbxc6 Rxe8+ Kxe8 Qh5+ Kd8 Qg8+ Nf8
Qgxf8#
7 52.50 320.89 50952k Qfxf6 Ngxe5 Rxf8 Nbxc6 Rxe8+ Kxe8 Qh5+ Kd8 Qg8+ Nf8
Qgxf8#
8 53.58 320.89 51871k Qfxf6 Ngxe5 Rxf8 Nbxc6 Rxe8+ Kxe8 Qh5+ Kd8 Qg8+ Nf8
Qgxf8#
8 1:08 320.89 67671k Qfxf6 Ngxe5 Rxf8 Nbxc6 Rxe8+ Kxe8 Qh5+ Kd8 Qg8+ Nf8
Qgxf8#
9 1:11 320.89 69836k Qfxf6 Ngxe5 Rxf8 Nbxc6 Rxe8+ Kxe8 Qh5+ Kd8 Qg8+ Nf8
Qgxf8# <ht>
9 1:46 320.89 106483k Qfxf6 Ngxe5 Rxf8 Nbxc6 Rxe8+ Kxe8 Qh5+ Kd8 Qg8+ Nf8
Qgxf8# <ht>
10 1:51 320.89 111023k Qfxf6 Ngxe5 Rxf8 Nbxc6 Rxe8+ Kxe8 Qh5+ Kd8 Qg8+ Nf8
Qgxf8# <ht>
10 3:03 320.89 186526k Qfxf6 Ngxe5 Rxf8 Nbxc6 Rxe8+ Kxe8 Qh5+ Kd8 Qg8+ Nf8
Qgxf8# <ht>
11 3:09 320.89 192691k Qfxf6 Ngxe5 Rxf8 Nbxc6 Rxe8+ Kxe8 Qh5+ Kd8 Qg8+ Nf8
Qgxf8# <ht>
11 5:24 320.89 333867k Qfxf6 Ngxe5 Rxf8 Nbxc6 Rxe8+ Kxe8 Qh5+ Kd8 Qg8+ Nf8
Qgxf8# <ht>
12 5:43 320.89 351228k Qfxf6 Ngxe5 Rxf8 Nbxc6 Rxe8+ Kxe8 Qh5+ Kd8 Qg8+ Nf8
Qgxf8# <ht>
12 9:01 16/107 Qxc7+ >exit
local: t=9:07 nps=1035781.7 n=566942340 (f=149619862 q=417322478)
total: t=9:07 nps=1035781.7 n=566942340 draws=40259
trans: probes=55260826 hits=8446959 (15.29%) draft=5114077 (9.25%)
tcuts: exact=232 (0.00%) upper=1257871 (2.28%) lower=3812673 (6.90%)
tstor: exact=422 (0.00%) upper=10632495 (59.68%) lower=7184056 (40.32%)
ext: check=43140568 recap=1653924 ppush=0 1rep=886378 thrt=0
q-moves: gen=3614191 tested=539649 made/un=223170 max-dep=12
max eval diff: part-1=1.74 part-2=1.50
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