Hi,
first of all thank you for developing this cool project you have here.
I love playing spider, but I find 4 colors, while doable, quite difficult, and 2 colors a little too easy. This is why I'd think a middle ground of 3 colors would add a lot of value for me.
I don't know if there are official rules for such a variant, but I vaguely remember an implementation having a 3 colors option, while researching apps for spider before settling on SolitairCG.
Of course 3 colors can't be added, when using 104 cards, without some asymmetry. To solve this I have these options in mind:
I'm not sure which one would be the most fun to play or if a fourth unthought solution would be better, so maybe we need some testing beforehand.
Would this be doable?
~ Sewbacca
It is possible that something like you mention would work.
I recommend that you figure out all the game variation details for a 3 suit version of spider solitaire, document these rules, and then play multiple games following your rules before you try to write software code to emulate the game.