Hi,
I'm having trouble figuring out the root ply of crafty.
Is it 0 or 1?
It looks 1, but ply 0 is used also for generating moves, make/unmake moves, etc.
Could someone please tell me exactely in wich cases ply 0 is used?
many thanks,
Alvaro
crafty question
Moderator: Ras
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Cardoso
- Posts: 363
- Joined: Thu Mar 16, 2006 7:39 pm
- Location: Portugal
- Full name: Alvaro Cardoso
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bob
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- Joined: Mon Feb 27, 2006 7:30 pm
- Location: Birmingham, AL
Re: crafty question
If, by "root ply" you mean the OTB position in the real game, that is ply 0. But the search works from ply 1 only. And ply 1 is a dead copy of ply 0 in that regard, so...Cardoso wrote:Hi,
I'm having trouble figuring out the root ply of crafty.
Is it 0 or 1?
It looks 1, but ply 0 is used also for generating moves, make/unmake moves, etc.
Could someone please tell me exactely in wich cases ply 0 is used?
many thanks,
Alvaro
always 1. If you are talking about the PV array, 0 is used to back up the PV to the main program. But for Crafty, ply starts at 1 and climbs, never dropping to 0 except when the search terminates.
ply 0 is the "master copy" of the castle status and such. I copy that to ply one and do the search. Ply 0 only gets modified by MakeMoveRoot() and UnmakeMoveRoot() as those values represent the current OTB game state.
Hope that helps.
Somewhat messy but I'm not going to try to clean it up and break everything.
