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rnbqkb1r/pp2p1pp/2pp1n2/5p2/2PP4/6P1/PP2PPBP/RNBQK1NR w KQkq - In my database, this position has the very unusual designation of "HD 4" in the Opening field. I guess it is a mistake, but I was wondering if there is a name for the opening terminating in this position. It gets played a lot, I have mo...

Your file also shows the draw rarity leaning:

That position popped up on a query meant to expose positions which have a small proportion of draws.
The number of wins and losses far outnumbers the draw count, which is very interesting.

rnbqkb1r/pp2p1pp/2pp1n2/5p2/2PP4/6P1/PP2PPBP/RNBQK1NR w KQkq - In my database, this position has the very unusual designation of "HD 4" in the Opening field. I guess it is a mistake, but I was wondering if there is a name for the opening terminating in this position. It gets played a lot, I have mo...

Do you use null move verification? I guess that zugzwang might play a role here. Another thing that might help is to scale pruning a bit using mobility. I use an s curve to decrease pruning when move choices are very limited and to increase pruning when there are a huge number of possible moves. I f...

That is quite a leap, +34b Elo better than the previous top score

I'm not sure why groups like TCEC are okay with calling Stockfish's implementation a "library" for "everyone to use". Do your own work, and it will pay dividends down the line. You also skip all the trash thats in Stockfish because its a weak Shogi port that was never cleaned up. I guess that they ...

Beyond Glaurung strength is mind boggling. I am really stunned at the progress of Olithink. I think you are teaching everyone a powerful lesson about simplicity (and even beauty). I guess that one of the things the NN engines add that is not properly performed in most chess engines is the focus on m...

I see. Yes, I meant LZ4. With the HC version using -9, it gets very good compression ratio. Now, it compresses slowly using those settings but it decompresses ultra-fast. That is why I thought it would be a good compression algorithm for tablebase files. Even though compression is slow, you only hav...