Deploy with 3-4-5 syzygybase

[ddugovic]

The other day someone was sharing games where AI level 8 randomly shuffled its pieces and even missed a win due to the 50-move rule. Sorry I don't have the game URLs.

Stockfish calculates more accurately with 3-4-5 WDL & DTZ models from https://syzygy-tables.info which is why the official-stockfish team uses those in its selfplay (parameter tuning and patch testing) tests. At the end of a PV, there may be 5 or fewer pieces, so it helps to be able to look up which endgames are won, drawn, or lost.

Pieces	Tables	WDL	DTZ	Total
3-5	145	378.1 MiB	560.9 MiB	939.0 MiB

[ianfab]

I would just like to add that if endgames are the issue, there might also be a way to mitigate by changing the balance between depth limit and movetime limit. I don't know if there are stats readily available but would assume that the rate of depth limit hits vs time limit hits is much higher with few pieces on the board, so it kind of gets handicapped more in the endgame. Adding TBs then of course would be even more helpful, just wanted to mention the alternative in case it is interesting as a low hanging fruit.