Author: Tony Werten
Date: 07:30:59 08/10/01
Go up one level in this thread
On August 09, 2001 at 06:12:52, Martin Giepmans wrote: >On August 09, 2001 at 02:39:53, Bruce Moreland wrote: > >>On August 08, 2001 at 19:17:47, Martin Giepmans wrote: >> >>>On August 08, 2001 at 17:18:02, Bruce Moreland wrote: >>> >>>>On August 08, 2001 at 16:43:39, Martin Giepmans wrote: >>>> >>>>>Yes, I see your point. Now the question is: is there always pollution? >>>>>I think 2 conditions are necessary: >>>>>(1) The score (+0.20) is influenced by a drawscore that is based on *external* >>>>>repetition. >>>>>(There is no problem with the influence of internal repetition) >>>> >>>>No, this is false. You can get to the same position at the same depth in the >>>>same iteration, and have subsequent moves with different repetition >>>>consequences. >>>> >>>I don't see how this could have a negative effect, if you do not use cutoffs >>>based on drawscores from the hashtable. >> >>Everything I have said in my posts in this thread is an attempt to show that >>draw scores that you encounter influence other scores. >> >>bruce > > >I understand what you are trying to say. Let's illustrate it with a (simplistic) >example: >Path A: 1. Nf3 Nf6 2. d4 d5 >Path B: 1. d4 d5 2. Nf3 Nf6 >Same position (P). Suppose these moves happen a little later in the game. After whites first move, it could have been a draw in A because of a 50 move rule, but not in B. cheers, Tony >The program first takes path A and discovers that Ng1 is the best move in P >(you need a weird static eval for that, but ok), score +0.40. >Now the program takes path B. Is Ng1 the best move? No, black plays Ng8 >and repeats the position after d4 d5. Score 0.00. >The best move is, say, Nc3. Score +0.10. > >I think this proves your point: drawscores influence other (nonzero) scores. >However, along path B white has obviously not played the best moves. >If white gets 0.10 instead of 0.40 there must be something wrong with either 2. >Nf3 or 1. d4 or both. >So, my question is: does this influence of drawscores minimax downto the root of >the tree? My first thougth was no, my last (thought 31) is: I really don't know >...
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