フォーティシーブズソリティアの完全なルールと難易度解説。
フォーティシーブズ（40人の盗賊）は2デッキを使う挑戦的なソリティアです。上級者向けですが、ルールを理解してゲームに挑戦しましょう。
フォーティシーブズは104枚（2デッキ）を使います。10列のタブローに各4枚（40枚、全て表向き）が配られ、残り64枚が山札になります。8つの基礎パイルにエースからキングまで同一スートで積むことが目標です。
タブローでは同じスートで降順のみ（例：スペードの10の上にスペードの9）カードを積めます。移動できるのは一度に1枚のみです。山札は1枚ずつ引き、使えない場合はウェイストパイルに置きます。
1枚ずつしか移動できないこと、同じスートでしかカードを積めないこと、山札の64枚を効率的に管理する必要があることが難しさの原因です。勝率は20〜35%と低く、上級者向けです。
At the start of each game, before drawing from the stock, scan all ten column tops for any moves available within the tableau itself. Same-suit sequences between column tops — a 7 of Spades on an 8 of Spades, for example — can be made immediately. Any Aces visible on column tops should be moved to foundations at once. After exhausting all opening tableau moves, begin drawing from the stock one card at a time, playing each drawn card to the tableau or foundation if possible, or leaving it on the waste pile if not.
The critical habit at each stock draw: before drawing, look at the current waste pile top and ask whether it can now be played given the current tableau state. The waste pile top card should be re-evaluated after every tableau move, because a move that frees a column top or creates an empty column may make the waste pile top playable when it was not a moment before.
Track the waste pile actively, not passively. Most casual players glance at the waste pile top when it is first drawn and ignore it thereafter. Expert play requires tracking the waste pile top after every individual tableau move — because the tableau changes with each move, the playability of the waste pile top changes too. Develop the habit of checking the waste pile top as the last step of every move sequence before drawing the next stock card. This habit alone recovers more missed plays than any other single adjustment.
Prioritise same-suit column building ruthlessly. The same-suit-only build rule means that a column containing mixed suits — even if the visible sequence looks orderly — is essentially stuck until the non-matching cards are cleared. When choosing between multiple available moves, always prefer the move that builds or extends a same-suit sequence over any move that creates a mixed-suit arrangement, even if the mixed-suit move looks locally productive. Mixed-suit columns are Forty Thieves' most common dead-end cause.
Manage empty columns as staging resources. An empty column in Forty Thieves is the closest equivalent to a free cell in FreeCell: it provides temporary storage for a card that needs to be moved out of the way to enable a more important sequence. The key discipline is to use empty columns for specific, planned staging moves — placing a card in an empty column to enable a same-suit sequence completion elsewhere — rather than filling them immediately with the first available King or high card. A filled empty column that was not serving a specific plan is a wasted resource.
Respect the single-pass constraint in every draw decision. Before drawing each stock card, ask: is there any rearrangement of the current tableau that would make more stock cards playable when they appear? If yes, exhaust that rearrangement before drawing. The single-pass constraint makes each unmade tableau move before a stock draw a potential permanent loss: if the stock card that appears would have been playable after the tableau rearrangement but is not playable before it, that card joins the waste pile and may never be accessible again.
Balance the eight foundations carefully. With two decks and eight foundations, suit balance becomes a genuine strategic variable. Advancing one suit's two foundations far ahead of the others creates suit-depletion asymmetry: cards of the advanced suit become unavailable for tableau building earlier than cards of lagging suits, reducing building flexibility precisely when the tableau is most complex. The practical habit: before each foundation play, check whether the suit being advanced is already two or more ranks ahead of any other suit's combined foundation progress. If so, consider whether the foundation play can be deferred without penalty.
Think Three Draws Ahead
Forty Thieves rewards players who plan not just the current move but the state of the tableau two to three stock draws from now. The question is not only whether the current waste or stock card can be played but whether playing it now leaves the tableau in a better or worse position to absorb the next two or three draws. Players who answer this question before each draw achieve measurably longer tableau sequences and fewer irrecoverable waste pile accumulations than players who evaluate only the immediate move.
Identify Dead-End Columns Early
A dead-end column is one whose top card cannot be moved to any other column top (no same-suit card of the correct rank is available) and cannot be sent to a foundation (the foundation has not advanced far enough). Dead-end column tops block access to all cards beneath them. Identifying dead-end columns early — and prioritising stock draws and tableau moves that un-stick them — prevents the cascade of blockages that ends most losing Forty Thieves games. The three-pattern structural diagnostic from our solitaire win rates guide applies directly: a confirmed circular dependency between column tops is the clearest signal that the current game is unwinnable.
Use the Complete-Information Advantage
Because all tableau cards are face-up, Forty Thieves offers a complete-information problem for the visible cards — unlike Klondike or Spider, where face-down cards create genuine uncertainty. Use this advantage by periodically scanning the full tableau (not just the accessible column tops) to identify which cards are buried under which columns and what sequence of moves would be needed to reach them. This full-tableau scan habit, applied every five to eight moves, prevents the common error of spending multiple moves preparing to play a card that turns out to be deeply buried under an inaccessible suit mismatch. Our FreeCell strategy guide covers the complete-information planning habits that transfer most directly to Forty Thieves play.
いいえ。非常に難しいゲームです。クロンダイクとフリーセルをある程度マスターしてから挑戦することをお勧めします。
基礎パイルへの道を常に優先し、同じスートのシーケンス作りに集中しましょう。山札をできるだけ効率的に使います。
アラビアンナイトの「アリババと40人の盗賊」に由来すると言われています。