Well, websites like LiShogi an PyChess just offer on-line versions of Fairy-Stockfish, rigged to play at very weak level, for a limited number of variants. So I don't see much use in mentioning those at all, if Fairy-Stockfish is already mentioned as a possible computer opponent.
Fairy-Stockfish is also configurable for other variants, in a straightforward way. But it seems to suffer from similar limitations as Sjaak II. (But is of course enormously stronger, 3000+ Elo vs ~2200 Elo.) One of these is that the board cannot have more than 128 squares (which in Fairy Stockfish seems to be further limited to max 10 ranks and max 12 files). And only a limited variety of pieces is supported: compound of leapers, sliders, knightrider, possibly as (grass)hoppers, possibly divergent. So no Griffon, for example. But many variants don't need more than that.
Well, websites like LiShogi an PyChess just offer on-line versions of Fairy-Stockfish, rigged to play at very weak level, for a limited number of variants. So I don't see much use in mentioning those at all, if Fairy-Stockfish is already mentioned as a possible computer opponent.
Fairy-Stockfish is also configurable for other variants, in a straightforward way. But it seems to suffer from similar limitations as Sjaak II. (But is of course enormously stronger, 3000+ Elo vs ~2200 Elo.) One of these is that the board cannot have more than 128 squares (which in Fairy Stockfish seems to be further limited to max 10 ranks and max 12 files). And only a limited variety of pieces is supported: compound of leapers, sliders, knightrider, possibly as (grass)hoppers, possibly divergent. So no Griffon, for example. But many variants don't need more than that.