Author: Christophe Theron
Date: 19:03:02 09/05/03
Go up one level in this thread
On September 04, 2003 at 10:20:40, Dana Turnmire wrote:
>In the following position Chess Genius 7 cannot find mate after many hours of
>analysing yet Chessmaster 9000 finds mate in 16 INSTANTLY. What gives?
>[d] 4r1r1/bB4p1/8/2p1kPKn/n7/3R4/3P4/2B5 w - -
I seem to remember that Genius 3 and Genius 5 have a 32 plies absolute limit.
I assume that Genius 7 has the same limit.
It can see *SOME* mate in 16 (33 plies deep) however because it seems that its
evaluation function is able to see that there exist a mate move in the position
after the 32th ply. It cannot make the mate move, but knows by evaluation that a
mate exists.
But maybe it cannot see all kinds of mates by evaluation and this position turns
out to be one of these cases.
I don't think the problem is check or mate extensions. Genius is very good at
this. The problem is absolute ply depth limit.
Christophe
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