Using UCI to get deterministic output from engine

[mcostalba]

Clearing hash is not even close to being enough. You need to clear primary hash (yes), clear pawn hash (no), clear eval hash (no), clear history counters (yes), clear killer moves (no, automaticaly cleared in search), clear counter-moves (yes)

Well 3 out of 6, not bad, could have been worse

[Evert]

Clearing hash is not even close to being enough. You need to clear primary hash (yes), clear pawn hash (no), clear eval hash (no), clear history counters (yes), clear killer moves (no, automaticaly cleared in search), clear counter-moves (yes)

Well 3 out of 6, not bad, could have been worse

Where does it say that you have to clear killer moves in search?

Agreed that you probably don't need to clear pawn hash and eval cache though, except if you're paranoid about false hash hits.

[bob]

Clearing hash is not even close to being enough. You need to clear primary hash (yes), clear pawn hash (no), clear eval hash (no), clear history counters (yes), clear killer moves (no, automaticaly cleared in search), clear counter-moves (yes)

Well 3 out of 6, not bad, could have been worse

Killer moves are not cleared automatically in most programs. Eval and pawn hash need to be cleared if the goal is deterministic behavior with respect to time as well as score.

I gave the safe approach.