Skip positions with score equal to Stockfish's VALUE_NONE (32002) #219
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With the recent new network for Stockfish it appears that we need to do some more costly filtering on the datasets (official-stockfish/Stockfish#4295). Removing positions from the dataset degrades compression, so in some cases it might be better to mark positions with a special flag and skip them on load. I think it's reasonable to use
score==VALUE_NONEas such a flag and this PR implements it.