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Subject: Re: Difficult test position

Author: Jon Dart

Date: 21:52:47 10/14/99

Go up one level in this thread


Arasan 5.2 plays a5 after 10 seconds:

ply 1.  Qd4+    0 seconds.      score:   0.16   2 nodes.
ply 1.  Qc7     0 seconds.      score:   0.31   11 nodes.
ply 1.  Qc7     0 seconds.      score:   0.31   43 nodes.
ply 2.  Qc7     0 seconds.      score:   0.11   298 nodes.
ply 3.  Qc7     0 seconds.      score:   0.16   1415 nodes.
ply 4.  Qd4+    0 seconds.      score:   0.06   3444 nodes.
ply 4.  a5      0 seconds.      score:   0.11   5980 nodes.
ply 4.  Qh8     0 seconds.      score:   0.75   10871 nodes.
ply 4.  Qh8     0 seconds.      score:   0.75   10879 nodes.
ply 5.  Qh8     0 seconds.      score:   0.66   18971 nodes.
ply 6.  Qh8     1 seconds.      score:   0.63   53719 nodes.
ply 7.  Qh8     3 seconds.      score:   0.55   191814 nodes.
ply 8.  a5      10 seconds.     score:   1.16   698587 nodes.
ply 8.  a5      10 seconds.     score:   1.16   728715 nodes.
ply 9.  a5      14 seconds.     score:   1.78   1044719 nodes.
ply 9.  a5      17 seconds.     score:   1.78   1266802 nodes.
ply 10. a5      24 seconds.     score:   2.41   1858528 nodes.
ply 10. a5      32 seconds.     score:   2.41   2521682 nodes.
ply 11. a5      50 seconds.     score:   3.03   3895495 nodes.

The lastest version I have (not released yet) takes 17 seconds
to find a5, but it sees the big win, with a score of 3+ pawns,
much sooner, after 29 seconds:

ply 1.  Qd4+    0 seconds.      score:  -0.06   15 nodes.
ply 1.  Qc7     0 seconds.      score:   0.22   21 nodes.
ply 1.  Qc7     0 seconds.      score:   0.22   52 nodes.
ply 2.  Qh8     0 seconds.      score:   0.03   456 nodes.
ply 2.  Qh8     0 seconds.      score:   0.03   474 nodes.
ply 3.  Qh8     0 seconds.      score:   0.00   2413 nodes.
ply 4.  Qh8     0 seconds.      score:   0.20   7658 nodes.
ply 5.  Qh8     1 seconds.      score:   0.27   27887 nodes.
ply 6.  Qd4+    1 seconds.      score:   0.47   72063 nodes.
ply 6.  Qd4+    2 seconds.      score:   0.47   90990 nodes.
ply 7.  Qd4+    4 seconds.      score:   0.50   249190 nodes.
ply 8.  Qd4+    6 seconds.      score:   0.55   466068 nodes.
ply 9.  a5      17 seconds.     score:   1.17   1454737 nodes.
ply 9.  a5      29 seconds.     score:   3.27   2491060 nodes.

--Jon



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