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Subject: Difficult test position

Author: James Robertson

Date: 18:27:35 10/14/99


Today in a 5 2 blitz game on FICS, my program reached this position and played
a5!, which wins. I guess this shows the advantages of a permanent brain, as it
couldn't find the same move in over one and a half minutes after the game.

3Q4/kp4pp/p3qr2/8/P1N1p3/1P1nP2P/2R3P1/6K1 w - - bm a5;

How long does it take your program to see a5 as substantially better than Qd4?
If you program gives a5 a score of about 1 to 1.5 pawns for white, it isn't
seeing everything. :)

CM5500:          6 seconds!
Crafty 16.18:    55 seconds
Insomniac 0.54:  1 min, 43 seconds
Crafty 16.16:    1 min, 59 seconds

Insomniac's results on a P233, 4MB hash (it had a 4MB hash in the game too).

 1      23        0          47  Qc7
 2      19       60         298  Qc7 Qf7
 3      17       60        2131  Qd4+ Kb8 Qd8+ Qc8 Qd4
 4     122      280        8323  Qh8 Qf7 Qxh7 Rf1+ Kh2
 5>    122      330       18382  Qd4+ Kb8 Qd8+ Ka7
 5     122      330       19133  Qd4+ Kb8 Qd8+ Ka7
 6     103      500       43431  Qd4+ Kb8 Qd8+ Ka7 Qh8
 7     103     1100      125435  Qd4+ Kb8 Qd8+ Ka7 Qh8 Qf7 Qxh7 Rf1+ Kh2 Qc7+ g3
 8     103     4290      582670  Qd4+ Kb8 Nd2 Nf2 Qd8+ Ka7 Nc4 Nd3
 9     103    13350     1871680  Qd4+ Kb8 Qd8+ Ka7
10     113    33120     4722362  Qd4+ Kb8 Nd2 Nf2 Rc4 Rf7 Nxe4 Rd7 Nc5 Rxd4 Nxe6
 Rxc4 bxc4
11>    385   103760    14085444  a5 Qf5 Nb6 Qf1+ Kh2 Rf8 Qd4 Kb8 Nd7+ Ka8 Nxf8 Q
xf8 Qxe4
11     385   103870    14101461  a5 Qf5 Nb6 Qf1+ Kh2 Rf8 Qd4 Kb8 Nd7+ Ka8 Nxf8 Q
xf8 Qxe4







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