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Why the difference in S,G,B breakdowns?

Posted By: Maik Stiebler
Date: Friday, 12 September 2008, at 5:54 p.m.

In Response To: Why the difference in S,G,B breakdowns? (Chuck Bower)

Do you mean the pruning algorithm prunes differently depending upon the opponent or more specifically the MET?

That might be true, but it is not what I meant.

I think a 4-ply evaluation is basically a 0-ply checker play / 0-ply cube rollout truncated after 4 plies. A rollout result depends on the moves which are chosen in the rollout, which is why we usually prefer a 2-ply rollout to a 0-ply rollout. If we roll out a position twice, with different METs, we can expect the results (specifically, the w/g/bg breakdowns) to differ slightly, because the moves chosen in the rollout might differ, e.g. due to different gammon prices. If a 4-ply eval is basically a rollout, we can expect that to depend on the chosen MET as well.

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