We use a randomization algorithm to generate games and don’t control for winnability, so some very, very rare games of Spider could be unwinnable.

With the ability to Undo moves and Replay games the number of winnable 1 Suit Spider deals is close to 100%, though some games are definitely very difficult. The number of winnable 2 Suit games is slightly lower, and the number of winnable 4 Suit games is lower than that.

We use a randomization algorithm to generate games - this means:

Because our games are not numbered, we cannot determine if a game is winnable or not.