FreeCell Two Decks, piece by piece: what doubled and what did not
Most of the two-deck table is simply twice the one-deck table: twice the cards, twice the free cells, twice the foundations. Not everything doubles, though. There are ten columns, not sixteen, so each column starts deeper: ten or eleven cards instead of six or seven. And the length of a win more than doubles. Our solver's first winning lines ran to 148.0 moves on average (95% range 145.9–150.1, 352 solved deals), where one-deck FreeCell needed 62.2 (61.9–62.4, 9,913 solved deals).
This page is the detailed guide to that bigger game: the rules as coded on this site, the full results of our 400-deal test, and what the deeper columns mean for your play. The game itself is also on our home page.
At a glance: the same game at two sizes
| FreeCell (one deck) | FreeCell Two Decks | |
|---|---|---|
| Cards | 52 | 104 |
| Columns and starting depth | 8 columns of 7 or 6 | 10 columns of 11 or 10 |
| Free cells / foundations | 4 / 4 | 8 / 8 |
| First winning line found, average | 62.2 moves (61.9–62.4) | 148.0 moves (145.9–150.1) |
| Solved by our solver | 99.7% (99.5–99.8%), 10,000 deals | 88.0% (84.4–90.8%), 400 deals |
| Proven impossible | 0.0% (0.0–0.04%) | 0.0% (0.0–1.0%) |
| Left undecided by the search | 0.3% (0.2–0.5%) | 12.0% (9.2–15.6%) |
| Search budget per deal | 200,000 positions, then 1,000,000 for open deals | 150,000 positions |
| Ace playable on move one | 49.0% (48.0–49.9%) | 55.0% (50.1–59.8%) |
The row to read carefully is "undecided". The two-deck search had a smaller budget for a much longer game, so 12.0% of deals were simply unfinished when it stopped. None was shown to be lost. That puts the true winnable share somewhere from 88.0% up to 100%. We cannot narrow it further from this sample, and no published study covers this game.
The rules as played here
- Cards: two standard decks, 104 cards, all dealt face up.
- Tableau: ten columns, the first four with eleven cards and the other six with ten.
- Free cells: eight, each holding one card.
- Foundations: eight, two per suit, built up from Ace to King.
- Building: down by one rank in alternating colors.
- Empty columns: take any card or legal run.
- Stock: none. Nothing is dealt later and nothing is hidden.
What the deeper columns mean for you
Low cards sit further down
With ten or eleven cards per column, an Ace near the top of a column can have nine cards over it. We found an Ace free on move one in 55.0% of deals, a little more often than the 49.0% of one-deck FreeCell, simply because there are eight Aces to draw on. For the rest, pick digs by how many cards cover a low card, not by which column is shortest.
An empty column takes longer to earn
In one-deck FreeCell a six-card column can be cleared early. Here even the short columns hold ten. Pick one column to empty and commit to it, instead of chipping at three.
Every card has a twin
There are two black 9s of each suit on the table. When a card can go onto either copy of its target, choose the one sitting in the column you do not plan to empty.
Two foundations per suit
You can build both piles of a suit at once. Keep them roughly level, so that low cards of each color stay available as landing spots in the tableau.
Cells are a shared budget
Eight cells for 104 cards is the same ratio as four for 52. The one-deck test shows what a lost cell is worth: at three cells 96.0% of deals were solved (95.3–96.7%), at two 74.0% (72.4–75.5%), at one 17.4% (16.1–18.8%), 3,000 deals each. We did not run that test on two decks, so treat it as a guide, not a measurement of this game.
Habits that turn a long game into a lost one
- Parking cards with no exit plan. Before a card goes into a cell, know which move brings it back out.
- Splitting effort across columns. Half-dug columns leave you with nothing empty.
- Racing one suit home. The twin foundation will need the cards you left behind.
- Giving up at move 100. A win here averages about 150 moves even for a program. Being stuck halfway is normal; rewind, do not redeal.
Playing on freecell-two-decks.com
FreeCell Two Decks is free in any current browser on computer, tablet or phone, with no account. Zoom and fullscreen keep ten deep columns readable. Hint, unlimited Undo, Restart and Auto Play are built in, you can drag or tap to move, and the game counts wins, time and moves. Sound and table color are in the settings.
How we ran the test
The freecell-two-decks.com team ran this test in September 2026 on the two-deck rules in this site's own game code. An AI assistant, Claude by Anthropic, helped write and review the Python code and draft this page. It produced no figures; every number comes from running the code.
- Rules from the code: 104 cards, ten columns of eleven and ten, eight cells, eight foundations, alternating colors, any card into a gap.
- Tuning kept apart from testing. One scoring setting was picked on deals 1 to 8. The test used deals 101 to 500.
- A best-first solver. It sees every card, as you do, and explores the most promising position first, with safe automatic moves to the foundations and a limit of 150,000 positions per deal.
- Three outcomes per deal: solved, proven impossible, or undecided.
- The one-deck figures come from the same kind of solver on 10,000 FreeCell deals, with 200,000 positions and a second pass of 1,000,000 on unfinished deals.
- No outside check. Blake and Gent (2026) cover one-deck FreeCell but not the two-deck game.
- Ranges are 95% Wilson score intervals for shares and normal intervals for averages. The first winning line found is not always the shortest one.
FreeCell Two Decks questions
Why is the solved share lower than one-deck FreeCell's?
Because the search stopped sooner on a longer game, not because deals were lost. 12.0% were undecided and 0.0% were proven impossible.
How long does a game take?
Expect well over a hundred moves. The solver's first wins averaged 148.0 moves, and people usually take more.
Is it a good first FreeCell?
Learn the plan on one-deck FreeCell first; the ideas carry straight over.
What other two-deck games are here?
Solitaire Double, Forty Thieves, Diplomat and Spider. The full list is on the games page.
By Admin, freecell-two-decks.com (Forty Media). Research run September 2026.