Learn beginner strategy for Forty Thieves Solitaire. Column management, foundation priority and waste pile discipline explained for new players.
Forty Thieves is the most demanding mainstream solitaire game that new players regularly attempt — and the one where the gap between casual and strategic play is widest. Two full decks, ten columns, a single-pass stock, and the same-suit-only build rule combine to create a game where every decision has permanent consequences and no lucky draw can rescue a string of poor moves. Casual players win roughly 5–10% of games. Players who apply even three or four of the strategic habits in this guide consistently win 20–30% — two to four times more often, with the same deals.
Forty Thieves is the most demanding mainstream solitaire game that new players regularly attempt — and the one where the gap between casual and strategic play is widest. Two full decks, ten columns, a single-pass stock, and the same-suit-only build rule combine to create a game where every decision has permanent consequences and no lucky draw can rescue a string of poor moves. Casual players win roughly 5–10% of games. Players who apply even three or four of the strategic habits in this guide consistently win 20–30% — two to four times more often, with the same deals.
The three dimensions that produce the biggest improvement fastest are column management (keeping columns productive rather than letting them lock up), foundation priority (knowing which cards to send up and when), and waste pile discipline (tracking and exploiting the single-pass stock rather than drawing reactively). This guide covers all three in depth, followed by the ten most impactful individual habits for new players. Our free Forty Thieves game is the best place to apply every tip from your very next hand.
Forty Thieves uses two standard 52-card decks shuffled together — 104 cards. Forty cards are dealt face-up into ten columns of four. Eight foundations (two per suit) build from Ace to King in suit. The remaining 64 cards form a single-pass stock: draw one card at a time onto the waste pile, play it to the tableau or foundation if possible, or leave it. Only the top card of the waste pile is ever accessible. Tableau columns build downward in the same suit only — a 7 of Clubs on an 8 of Clubs, never on an 8 of Hearts. Only one card may be moved per turn; multi-card sequence moves are not permitted. The stock passes through exactly once with no redeal. Win by completing all eight foundations. For full rules see our complete Forty Thieves guide.
Column management is the skill that most separates beginners from competent Forty Thieves players. Because only one card may move per turn and columns build in the same suit only, it is remarkably easy to create a column that looks occupied but is effectively dead — a column whose top card cannot move to any other column, cannot reach the foundation yet, and blocks everything beneath it indefinitely. A dead column is not just a wasted space; it is an active obstacle that reduces the accessible card population and consumes the tableau area that functional columns need to operate.
Distinguish between active columns and dead columns from the first move. An active column is one whose top card can either move to another column top (same suit, one rank lower destination) or will reach the foundation within the next few moves. A dead column is one whose top card has no valid tableau destination and is too far from the foundation to send up. Identify dead column tops early — before they accumulate multiple layers of dead cards above them — and prioritise tableau moves and stock draws that un-stick them.
Preserve same-suit column integrity ruthlessly. The same-suit-only build rule means that a column containing mixed suits — even if the top few cards are in order — will eventually produce a dead position where the non-matching card is unreachable below a same-suit sequence it cannot join. Before every tableau move, ask: does this move create or extend a same-suit sequence, or does it place a card on a column where its suit will eventually conflict with the card beneath it? Mixed-suit placement is the primary cause of dead columns and the most common beginner error in Forty Thieves.
Use empty columns as staging areas, not parking spots. An empty column is the closest equivalent to a free cell in Forty Thieves — it can hold one card temporarily to enable a same-suit sequence completion elsewhere. The correct use: identify a same-suit sequence that is one card-move away from completing, use the empty column to temporarily stage the obstructing card, complete the sequence, then reassign the empty column. The incorrect use: fill the empty column immediately with whatever high card is accessible, blocking it as staging resource for the rest of the game. Every premature empty-column fill is a permanently lost staging opportunity.
Thin the deepest columns first when all else is equal. A ten-column tableau with one column at four cards and another at one card is more flexible than one where all columns are at two or three — because the deep column represents future accessible cards that will appear as its top cards are cleared. When choosing between equally valid moves, prefer the one that reduces the card count of the deepest column: it opens more future options proportionally than the same move applied to a shallow column.
Foundations in Forty Thieves are not the passive destination they appear to be — they are an active resource management decision. With eight foundations and 104 cards, the rate at which you advance each suit's foundations directly determines the tableau's flexibility at every stage of the game. Send cards up too slowly and the tableau fills with low-rank cards that block same-suit sequence building; send them up too fast and you deplete the tableau's low-rank building supply before mid-rank cards have somewhere to go.
Send Aces to the foundation the moment they appear — without exception. An Ace in a column top or on the waste pile serves zero tableau purpose. It cannot be built upon in the tableau, and leaving it in place blocks the card beneath it while contributing nothing. Every Ace that is not immediately sent to the foundation is a wasted turn and a blocked column position.
Send 2s and 3s immediately when both Aces of that suit are established. Once both Aces of a suit are on the foundation, its 2s have no tableau role and should follow at the first opportunity. 3s are similarly low-value in the tableau once the 2s are established — they cannot sit on a 4 of a different suit, and keeping them in columns prevents the foundation from advancing to the point where it can receive the 4s and 5s that will clear column space later.
For ranks 4 through 7, apply the balance check before sending. A mid-rank card is safe to send to its foundation when doing so does not leave any same-colour foundation more than two ranks behind its partner. The risk: if one suit races to rank 7 while its same-colour partner is still at rank 3, the lagging suit's low cards pile up in the tableau without valid same-suit building destinations — because their natural sequence partners (the cards one rank above in the same suit) have already been sent to the foundation and removed from the building pool. Keep same-colour foundation pairs advancing within two ranks of each other.
For ranks 8 and above, verify the card is not a current tableau anchor before sending. High-rank cards (8 through King) are Forty Thieves' most active same-suit sequence builders. A 9 of Diamonds with an 8 of Diamonds sitting below it is a two-card same-suit sequence; send the 9 to the foundation and the 8 loses its partner and may become a dead column top. Before sending any card ranked 8 or above, scan the tableau for same-suit sequences it is currently anchoring. If it is anchoring an active sequence, wait. If it is isolated with no same-suit partner accessible below it, send it.
Never let a suit fall more than three ranks behind its paired foundation. With two foundations per suit, both of a suit's foundations should advance together or at most one rank apart. If one Hearts foundation is at rank 6 and the other is still at rank 2, the rank-2 foundation is producing a Hearts bottleneck: Hearts cards ranked 3, 4, 5 are piling up in the tableau or waste pile waiting for the slow foundation to reach them. When you notice a same-suit foundation pair diverging by more than two ranks, prioritise the lagging foundation's next card above almost everything else.
1. Check the Waste Pile Top After Every Single Tableau Move
The waste pile top card changes accessibility every time a tableau move creates a new column top or empty space. Most beginners check the waste pile only after drawing. The correct habit: after every individual tableau move — including moves that do not involve the waste pile at all — glance at the waste pile top and ask whether it is now playable to a tableau column or foundation. This habit alone recovers more missed plays per session than any other single adjustment in Forty Thieves.
2. Never Make a Move That Creates a Mixed-Suit Column
Same-suit-only building means that placing a card on a column where its suit does not match the card beneath it will eventually produce a dead position. Before every tableau move, confirm that the destination column's current top card and the card you are placing share the same suit in the correct rank sequence. If they do not share suit, do not make the move — find an alternative.
3. Use Empty Columns for Planned Staging Moves Only
An empty column used for a specific planned same-suit sequence completion is one of Forty Thieves' highest-value plays. An empty column filled reflexively with the nearest accessible high card is a permanently lost staging resource. Before filling any empty column, identify the specific sequence completion it enables. If you cannot name one, leave it empty.
4. Send Aces Immediately, Every Time
Aces in column tops or on the waste pile go to the foundation without deliberation. No Ace has any tableau value and delaying by even one draw can bury the Ace under subsequent waste pile cards, making it inaccessible until those cards are cleared.
5. Keep Same-Colour Foundation Pairs Within Two Ranks of Each Other
Foundation imbalance between same-colour suits is one of the most common endgame loss causes in Forty Thieves. The balance check takes two seconds before each foundation play: glance at the paired foundation of the same colour and confirm the gap is two ranks or fewer. If sending a card would widen that gap to three or more, consider whether an alternative tableau move should be made first.
6. Exhaust All Tableau Moves Before Each Stock Draw
Every card drawn from the single-pass stock that could have been deferred by a tableau move is a permanent reduction in future stock availability. Before drawing, confirm there are no tableau-to-tableau moves and no tableau-to-foundation moves available. In Forty Thieves, the discipline to pause and scan before every draw is the single most impactful stock management habit and takes fewer than five seconds per draw opportunity.
7. Prefer Moves That Uncover the Top Card of Deep Columns
A four-card column whose top card is moved exposes the card beneath it — expanding accessible options. A one-card column whose card is moved empties the column. Both are useful, but deep column uncovering is more immediately valuable because it adds to the accessible pool rather than simply reducing column count. When multiple moves are available, prefer those that reduce the deepest columns first.
8. Track High-Value Waste Pile Cards Actively
When a card you need — an Ace, a same-suit sequence partner, a foundation-ready card — disappears under subsequent waste pile draws, do not forget it. Keep a rough mental note of which important cards are buried in the waste and approximately how many draws separate them from the top. This tracking prevents the common mistake of drawing past a critical card and then building a strategy that requires it, only to discover it is inaccessible for another thirty draws.
9. Do Not Send a Card to the Foundation If It Is Anchoring a Same-Suit Sequence
A card that is the top of a same-suit tableau sequence — with a same-suit card one rank lower directly beneath it — is providing a building resource that may be needed for future sequence extensions or column management moves. Sending it to the foundation collapses the sequence and may strand the card below it as a dead column top. Always check for same-suit anchoring before any foundation play ranked 6 or above.
10. Resign Confirmed Dead Positions Efficiently
Forty Thieves has one of the highest unwinnable deal rates of any mainstream patience game — approximately 40–60% of hands cannot be cleared regardless of play quality. A confirmed dead position is one where a circular dependency exists (two or more column tops each blocking the other), a suit-critical card is buried beyond any accessible rearrangement path, or the waste pile is exhausted with foundation-critical ranks still locked in dead columns. Recognising this position and starting a fresh hand preserves twenty minutes of playing time per session that would otherwise be spent on a hand that cannot be won. See our solitaire win rates guide for the diagnostic framework.
The most damaging beginner mistake in Forty Thieves is treating the tableau as a sorting exercise — moving cards into visually tidy arrangements without checking whether those arrangements preserve same-suit sequence integrity. A column that looks ordered but contains a suit mismatch three cards down will produce a dead position that no amount of subsequent play can resolve. Same-suit integrity checking before every move is the non-negotiable foundation of competent Forty Thieves play.
The second most common mistake is drawing from the stock the moment the current tableau feels stuck. Forty Thieves rewards players who spend thirty seconds exhaustively scanning the tableau before each draw — checking not just the most obvious column tops but every accessible card against every other accessible card and against the current waste pile top. A missed tableau move before a stock draw is a permanent loss; a stock draw that buries a needed card is a permanent setback. Both are avoidable with the pre-draw scan habit.
Three structural properties combine to make Forty Thieves uniquely demanding. The same-suit-only build rule eliminates the alternating-colour flexibility of Klondike and severely restricts which tableau moves are valid at any given moment. The single-pass stock means every draw decision is permanent — there is no second pass to retrieve a card passed over. And the one-card-per-move rule prevents multi-card sequence transfers that would allow rapid column reorganisation. Together these three constraints create a game where the margin for error is the smallest of any mainstream patience variant and the win rate gap between casual and strategic play is the largest. For the full difficulty analysis, see our expert solitaire games guide.
Apply a four-tier priority system. Tier one — send immediately: Aces always, and 2s and 3s as soon as both Aces of the suit are established. Tier two — send after the balance check: cards ranked 4 through 7, when same-colour foundation pairs are within two ranks of each other. Tier three — send only when not anchoring: cards ranked 8 through King, after confirming the card is not the top of an active same-suit tableau sequence. Tier four — never send proactively: any card whose foundation play would widen a same-colour foundation gap to three ranks or more, or strand an active same-suit sequence partner as a dead column top. Play our free Forty Thieves game and apply this tier system from your next hand.
Treat every empty column as a staging resource with a specific planned purpose rather than a parking spot for the nearest accessible card. Before filling any empty column, identify the same-suit sequence completion or column unblocking move the empty space enables. Use it for that purpose, then evaluate whether the completed sequence has freed another card that can now be played before the column is filled with a permanent occupant. An empty column used for one planned sequence completion before being filled is worth dramatically more than an empty column filled immediately. For the full column management framework see our complete Forty Thieves strategy guide.