"Sly" is what you have to be in order to win this game.

The rules are quite original in that you must place 20 cards at a time on the Tableau before you are allowed to make any moves from Tableau to Foundations (except those moved directly to the Foundatons during deals).

There are still some adjustments to be made before this game plays exactly according to lady Cadogan's rules, but if anything our rules are slightly easier, for which you should probably be thankful — With Foundations going in both directions and no special build rules for the Tableau, it's up to you and a great deal of thinking to sort things out!

This game is also mentioned in the descriptions of:
Casket, Strategy, Puss in the Corner.