Very dependent on the variety of solitaire.
Klondike (that's regular old American Solitaire) I run around 20% wins.
Scorpion, Alaska, Ukranian Solitaire, and Russian Solitaire, and Spider I run around 5%.
My latest favorite is Batsford, which is nigh impossible, 1-2% wins.
I have a lot of time on my hands, and 250 versions of solitaire.
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