What are the odds on completing spider solitaire

If you are good at it, then you can finish it easily. It is probably a 50% vs 50% chance of completing it if you just started playing.
Different answerer: I've found the odds of winning one suit games is about 90%, the odds of winning two suit games is about 55%, & the odds of winning four suit games is about 15%. I don't know how to prove this mathematically. But, one could write a computer program that 1). makes a random deal, then 2). plays that draw in all possible ways to see if that deal is winnable. You could impose rules for play & speed the play. 3). Add one to the possible or not possible tallys. Then, make another deal.