Author: Carlos del Cacho
Date: 10:53:16 09/16/00
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On September 16, 2000 at 12:25:27, Larry Griffiths wrote: >I have tried using a 64-bit hash key and storing it in each hash entry to insure >that different positions that point to the same hash table entry can be >verified. > >I also have a 32 byte smallboard that I use for debugging. This smallboard has >4bits for each piece color and type so I know for sure if the current position >matches the hash table entry. > >The 64-bit hashkey works most of the time, but sometimes different board >positions produce the same hash-key. > >Is there a fail-safe method other than my 32 byte smallboard for insuring that >different board positions with the same hash keys can be resolved? > >Larry. Since you store also a move from the position (for move ordering), you should look if it is valid when you retrieve information from the hash table. This isn't 100% safe but it's ok. I'm currently worried about collisions in null move searches (no move stored there, so chances of using wrong info increase). What do you guys do there ? Carlos
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