A detailed study has been done on the solvability of Spider solitaire games using software. Winning chances in a normal game with good play are considered to be about 1 in 3 games.
The game's difficulty can vary depending on the number of suits and the specific layout of the cards. Some configurations may make it impossible to clear all the cards, resulting in an unwinnable game. However, the majority of Spider Solitaire games are winnable with the right strategy and moves.