Author: Scott Gasch
Date: 11:24:15 07/25/04
Go up one level in this thread
On July 25, 2004 at 09:10:19, Stuart Cracraft wrote: >So at the root, in the opening position, I play e4. >At the third ply of iterative deepening, the program >hits the position after 1 e4, e5; 2 Qh5, Bc5; 3 Qxe5. No >null move has been played here due to being in check. >The program now cycles through the only legal black >replies of 3 ... Ne7, 3 ... Be7, 3 ... Kf8, and 3 ... Qe7. >Going into this, alpha is -6 from the previous position. >None of these moves improves alpha and this value is >returned with no best move stored in the hash table. > >My question is: is this a problem or expected given >the position? > This is a fail low node and they are quite common. In your tree you should now see the the move leading to this position (Qxe5) fail high (return a score >= beta). If you have good move ordering you searched that move first. Now you can cut off here and not search the rest of white's moves on that ply. Scott
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