Uri Blass wrote:diepeveen wrote:Daniel Shawul wrote:How much "tactics" can the evaluation do? If we say a good eval is worth one ply, we can do a 1 ply search for depthleft 4,3,2 and qsearch for depthleft = 1. This will be slower in general than just using plain R=3 with a fat eval, but it will surely cover up for most of the bad effects of nullmoving at the tips. I think it might be safer to cover search problems with search.
I understand that your approach is to use R=3 everywhere with good eval and no dubious stuff. Which approach wins, i have no idea
daniel
about winning approach: Zappa became world champion with this 'diep' approach. So there is your proof.
Vincent
The question is if zappa does not do pruning stuff except null move pruning.
one idea that I remember from anatony posts is that when the evaluation is bad relative to alpha and the remaining depth is 1 you can generate only captures and promotions and checking moves and not try more moves.
If he is using this idea in zappa then it means that zappa does not try all moves in the last ply so he is using tricks except null move pruning.
Uri
The world champs zappa version didn't use any other forward pruning else but nullmove.
That's why it got 14 ply at 4 processors first move out of book,
versus shredder and junior 20 ply.
Fruit single cpu already gets 17 ply.
Look, fruit without history pruning can get hands down 15 ply single cpu. It gives it only 1.5 ply or so.
So if you remember a posting one day doesn't mean he used that.
A suggestion is a suggestion nothing else. I remember i suggested many forward pruning concepts. Sure i tried many, but currently in diep. The only thing inside it, is nullmove.
Read my lips, whatever Zappa releases with, in tournaments he'll just use nullmove and nothing else.
Please don't do too many of the above nonsense postings. If you seem to remember something or not, i have no time to react on such beginners postings.
Vincent
