I wouldn't bother about Sac Chess. It doesn't seem good enough to spread it. I just wanted it on behalf of the inventor, who describes himself as technically challenged. And it was a very useful exercise for debugging both Sjaak and WinBoard considering unusual castling.Evert wrote:Mexican Chess I can add easily enough to SjaakII (which reminds me: do you have a working definition for Sac Chess that I can include?). Ciccolini's unfortunately not (the Dabbabarider is problematic).
Mexican Chess is also not so special, but I wanted a 10x10 variant without frills to test the new capabilities of Fairy-Max (to test the counting-from-0 code). So I went to the chess10x10.com website, and found this. It had Camels as extra pieces, which would put the new Camel piece I added to XBoard to good use. (Are there even camels in Mexico???) That made it more attractive than Roman Chess, which had Commoners, or any of the 10x10 variants that just use extra FIDE pieces. Ciccolini's Chess likewise had Zebras, one of the other new pieces (although it calls them Elephants). The obvious 10x10 choice, Grand Chess, is problematic for Fairy-Max because of the non-standard initial position (Fairy-Max assumes back-rank pieces and 2nd-rank Pawns), and promotion rules.