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I can imagine that with hybrid evaluation even a random net still can still give good results, because the random eval is just some noise, and the classical evaluation still gives a clear direction. In contrast, 2600+ with pure random evaluation should be close to impossible, I would rather guess ar...

The python and JS bindings of Fairy-Stockfish also support the generation of various move notation formats , including the international/WXF Xiangqi notation, so they can also be used as simple parsers by checking if a given move string is in the generated list. Such a simple parser of course can no...

I just put together a first version of the introduction to the code base, see https://github.com/ianfab/Fairy-Stockfi ... g-the-code.

As you already found out, I use bitboards with 128 bit for the large-board version that supports board sizes up to 12x10, and 8 bit remain unused. For variants that use smaller boards than the bitboard size of the respective version (128bit/64bit), a bitboard containing the actual squares of the boa...

In Fairy-Stockfish the base piece values are the same for all variants, they are only adjusted for a few rules that can heavily influence dynamics like losing chess rules, piece drops, and board size (for sliders). E.g., for drop games, the piece values are scaled by a v_max/(v_max+v) formula, wher...

In Fairy-Stockfish the base piece values are the same for all variants, they are only adjusted for a few rules that can heavily influence dynamics like losing chess rules, piece drops, and board size (for sliders). E.g., for drop games, the piece values are scaled by a v_max/(v_max+v) formula, where...

Yes, that was a bit of an overstatement, I meant that the terms are the same, while the piece values (apart from rook and bishop) and a few other things of course differ. However, the evaluation function is quite generic, i.e., it chooses/modifies the evaluation terms based on the rules/features of ...

Actually many of the top shogi engines are very similar and based on Stockfish (Dolphin, YaneuraOu, Apery, ...), but their strength comes from the evaluation files they use. The evaluation files are no (deep) neural networks but as far as I know just some coefficients for low-order polynomials of pi...

The problem with S-Chess for lichess is not the lack of popularity, but that it uses fairy pieces and gating of pieces which both do not exist on lichess yet, so it would perhaps require more work than other lichess variants. I think in hindsight they would not add racing kings again, but it can not...

Although the last release was only one month ago, I decided to make a new release due to two major new features, namely Xiangqi and CECP/XBoard protocol support. Fairy-Stockfish can now be used without UCI2WB adapter in WinBoard/XBoard. https://github.com/ianfab/Fairy-Stockfish/releases/tag/fairy_sf...