Author: Mike Byrne
Date: 21:20:21 04/16/05
Go up one level in this thread
On April 16, 2005 at 22:13:45, John J. J. Smith wrote:
>[d]8/8/8/2p5/1pp5/brpp4/qpprpK1P/1nkbn3 w - - 0 1
>
>This seems to be a difficult problem for most engines. The key move is 2.h3.
>2.h4 only leads to a draw
Added a little code to Crafty handle the case where the one side has only one
piece to disable null move.
Crafty 19.20 (modified)
[d]8/8/8/2p5/1pp5/brpp4/qpprpK1P/1nkbn3 w - - 0 1
White(1): g
clearing hash tables
time surplus 57.19 time limit 23.23 (3:36)
depth time score variation (1)
18-> 0.06 0.01 1. Kxe1 Qa1 2. h4 Qa2 3. h5 Qa1 4.
h6 Qa2 5. h7 Qa1 6. h8=Q Qa2 7. Qe5
Qa1 8. Qh8 (s=3)
19 0.08 0.01 1. Kxe1 Qa1 2. h4 Qa2 3. h5 Qa1 4.
h6 Qa2 5. h7 Qa1 6. h8=Q Qa2 7. Qe5
Qa1 8. Qh8 (s=2)
19-> 0.09 0.01 1. Kxe1 Qa1 2. h4 Qa2 3. h5 Qa1 4.
h6 Qa2 5. h7 Qa1 6. h8=Q Qa2 7. Qe5
Qa1 8. Qh8 (s=3)
20 0.11 0.01 1. Kxe1 Qa1 2. h4 Qa2 3. h5 Qa1 4.
h6 Qa2 5. h7 Qa1 6. h8=Q Qa2 7. Qe5
Qa1 8. Qh8 (s=2)
20-> 0.12 0.01 1. Kxe1 Qa1 2. h4 Qa2 3. h5 Qa1 4.
h6 Qa2 5. h7 Qa1 6. h8=Q Qa2 7. Qe5
Qa1 8. Qh8 (s=3)
21 0.14 0.01 1. Kxe1 Qa1 2. h4 Qa2 3. h5 Qa1 4.
h6 Qa2 5. h7 Qa1 6. h8=Q Qa2 7. Qe5
Qa1 8. Qh8 (s=2)
21-> 0.15 0.01 1. Kxe1 Qa1 2. h4 Qa2 3. h5 Qa1 4.
h6 Qa2 5. h7 Qa1 6. h8=Q Qa2 7. Qe5
Qa1 8. Qh8 (s=2)
22 0.19 0.01 1. Kxe1 Qa1 2. h4 Qa2 3. h5 Qa1 4.
h6 Qa2 5. h7 Qa1 6. h8=Q Qa2 7. Qe5
Qa1 8. Qh8
22-> 0.22 0.01 1. Kxe1 Qa1 2. h4 Qa2 3. h5 Qa1 4.
h6 Qa2 5. h7 Qa1 6. h8=Q Qa2 7. Qe5
Qa1 8. Qh8 (s=2)
23 0.26 0.01 1. Kxe1 Qa1 2. h4 Qa2 3. h5 Qa1 4.
h6 Qa2 5. h7 Qa1 6. h8=Q Qa2 7. Qe5
Qa1 8. Qh8
23-> 0.29 0.01 1. Kxe1 Qa1 2. h4 Qa2 3. h5 Qa1 4.
h6 Qa2 5. h7 Qa1 6. h8=Q Qa2 7. Qe5
Qa1 8. Qh8 (s=2)
24 0.36 0.01 1. Kxe1 Qa1 2. h4 Qa2 3. h5 Qa1 4.
h6 Qa2 5. h7 Qa1 6. h8=Q Qa2 7. Qe5
Qa1 8. Qh8
24-> 0.40 0.01 1. Kxe1 Qa1 2. h4 Qa2 3. h5 Qa1 4.
h6 Qa2 5. h7 Qa1 6. h8=Q Qa2 7. Qe5
Qa1 8. Qh8 (s=2)
25 0.50 0.01 1. Kxe1 Qa1 2. h4 Qa2 3. h5 Qa1 4.
h6 Qa2 5. h7 Qa1 6. h8=Q Qa2 7. Qe5
Qa1 8. Qh8
25-> 0.54 0.01 1. Kxe1 Qa1 2. h4 Qa2 3. h5 Qa1 4.
h6 Qa2 5. h7 Qa1 6. h8=Q Qa2 7. Qe5
Qa1 8. Qh8 (s=2)
26 0.65 0.01 1. Kxe1 Qa1 2. h4 Qa2 3. h5 Qa1 4.
h6 Qa2 5. h7 Qa1 6. h8=Q Qa2 7. Qe5
Qa1 8. Qh8
26-> 0.70 0.01 1. Kxe1 Qa1 2. h4 Qa2 3. h5 Qa1 4.
h6 Qa2 5. h7 Qa1 6. h8=Q Qa2 7. Qe5
Qa1 8. Qh8 (s=2)
27 0.87 0.01 1. Kxe1 Qa1 2. h4 Qa2 3. h5 Qa1 4.
h6 Qa2 5. h7 Qa1 6. h8=Q Qa2 7. Qe5
Qa1 8. Qh8
27-> 0.94 0.01 1. Kxe1 Qa1 2. h4 Qa2 3. h5 Qa1 4.
h6 Qa2 5. h7 Qa1 6. h8=Q Qa2 7. Qe5
Qa1 8. Qh8 (s=2)
28 1.20 0.01 1. Kxe1 Qa1 2. h4 Qa2 3. h5 Qa1 4.
h6 Qa2 5. h7 Qa1 6. h8=Q Qa2 7. Qe5
Qa1 8. Qh8
28-> 1.34 0.01 1. Kxe1 Qa1 2. h4 Qa2 3. h5 Qa1 4.
h6 Qa2 5. h7 Qa1 6. h8=Q Qa2 7. Qe5
Qa1 8. Qh8 (s=2)
29 1.67 0.01 1. Kxe1 Qa1 2. h4 Qa2 3. h5 Qa1 4.
h6 Qa2 5. h7 Qa1 6. h8=Q Qa2 7. Qe5
Qa1 8. Qh8
29-> 1.79 0.01 1. Kxe1 Qa1 2. h4 Qa2 3. h5 Qa1 4.
h6 Qa2 5. h7 Qa1 6. h8=Q Qa2 7. Qe5
Qa1 8. Qh8 (s=2)
30 2.26 0.01 1. Kxe1 Qa1 2. h4 Qa2 3. h5 Qa1 4.
h6 Qa2 5. h7 Qa1 6. h8=Q Qa2 7. Qe5
Qa1 8. Qh8
30-> 2.42 0.01 1. Kxe1 Qa1 2. h4 Qa2 3. h5 Qa1 4.
h6 Qa2 5. h7 Qa1 6. h8=Q Qa2 7. Qe5
Qa1 8. Qh8 (s=2)
31 2.98 +1 1. Kxe1!!
31 4.09 +3 1. Kxe1!!
31 4.09 +M 1. Kxe1!!
31 4.09 Mat16 1. Kxe1 Qa1 2. h3 Qa2 3. h4 Qa1 4.
h5 Qa2 5. h6 Qa1 6. h7 Qa2 7. h8=N
Qa1 8. Nf7 Qa2 9. Nd6 Qa1 10. Ne4 Qa2
11. Nxc5 Qa1 12. Nd7 Qa2 13. Nb6 Qa1
14. Nxc4 Qa2 15. Na5 Qa1 16. Nxb3#
31-> 4.34 Mat16 1. Kxe1 Qa1 2. h3 Qa2 3. h4 Qa1 4.
h5 Qa2 5. h6 Qa1 6. h7 Qa2 7. h8=N
Qa1 8. Nf7 Qa2 9. Nd6 Qa1 10. Ne4 Qa2
11. Nxc5 Qa1 12. Nd7 Qa2 13. Nb6 Qa1
14. Nxc4 Qa2 15. Na5 Qa1 16. Nxb3#
(s=3)
time=4.34 cpu=162% mat=-38 n=19756942 fh=96% nps=4.55M
ext-> chk=721197 cap=31648 pp=10247 1rep=58854 mate=0
predicted=0 nodes=19756942 evals=258318 50move=0
endgame tablebase-> probes=0 hits=0
SMP-> split=7411 stop=48 data=11/64 cpu=7.07 elap=4.34
mate in 16 moves.
White(1): Kxe1
time used: 4.34
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Last modified: Thu, 15 Apr 21 08:11:13 -0700
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