Author: Jeremiah Penery
Date: 03:32:12 01/11/99
Go up one level in this thread
On January 11, 1999 at 04:40:54, Robert Wilkins wrote:
>On January 10, 1999 at 18:15:57, William Kerr wrote:
>
>>Normally CM6000 is very fast at finding mates during normal game playing or
>>position analysis.
>>
>>Here is a mate in six problem that CM6000 analyzed in infinite mode (standard
>>settings). Note: this is not the mate finder mode but CM6k's normal playing
>>engine. In this position white is to move. Normally, CM6000 solves mates very
>>fast up to mate in 18 assuming many move are checks. In this position, CM6000
>>took 58 seconds to see the mate but when forced to move announced "MATE IN 8".
>>If given several minutes to analyze the problem it correctly anounced "MATE in
>>5". So far out of 25 or so mate in 6 problems presented to CM6000 this position
>>took the longest to solve in the specified number of moves. Extreme Chess did
>>not see any mate nor did Rebel Decade 2.0 when given more than 10 minutes to
>>ponder this position (mate finder mode not used). These programs were run on a
>>PII 300 Mhz 32 Meg hash for CM6k, default hash for Rebel Decade 2.0 and unknown
>>hash for Extreme (probably 24 meg).
>>
>>White to move - mate in 6
>>
>>5N1R/5R2/5N2/K4k2/5p1p/1PB4b/2pp1P2/2bq4 w
>
>I set up this position (as above) 5N1R(rank 8) to bottom (rank 1) and my CM6000
>says no mate found in about 3 secs - assume this position is correct as Caps
>are black.
No, the position is correct as written. White is upper-case. As he said above,
CM6k took about a minute to find the mate, whereas you only let it search 3
seconds.
Crafty 16.3(modified) takes slightly longer to find the mate:
8 1:29 Mat06 1. Rb7 Bf1 2. Rbh7 Be2 3. Rd7 Bc4 4.
bxc4 f3 5. Rd5+ Kf4 6. Rxh4#
It finds the mate here, but takes until 2:09 to verify it.
Jeremiah
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