Easthaven will feel familiar if you play Klondike: columns build down in alternating colors, and foundations build up from the Aces. The difference is the stock.
Rather than turning cards onto a waste pile, each click of the stock deals a card onto every column. That can cover the very cards you were working toward, so the question is always when to deal.
Twenty-one cards are dealt into seven columns of three, with only the bottom card of each face up. The other 31 cards form the stock, and the four foundations start empty.
Move all 52 cards to the foundations. Once the stock is gone and every card is face up, autocomplete can finish the game when the rest go up in order.
We ran our own solver on 200 shuffled deals of this version. It found a win in 39 of 200 (20%), showed that 8 could not be won, and ran out of its budget of 20,000 positions a deal on 153.
Those undecided deals may still be winnable, so treat the win count as a minimum. The solver can see every card, including face-down ones, so it measures what the cards allow, not how often a person will win.
Love Easthaven? Try these other solitaire variants on Solitaire Scramble:
Klondike deals 28 cards and turns the stock onto a waste pile. Easthaven deals 21, and the stock deals a whole row onto the columns. Any card can fill an empty column, not only a King.
No. In Easthaven you can deal at any time, and an empty column just gets a card from the deal.
Yes. Undo works on deals here as well as on moves.
No, not in this version. Some versions allow it, but once a card is on a foundation here, only Undo brings it back.