Spider Solitaire Odds by Suit Count
Spider Solitaire is really three games wearing the same board. The ten columns, the 50-card stock, and the eight-run goal never change — but sliding the suit count from one to two to four transforms the odds more dramatically than any rule change in any other major solitaire. This page lays out what is known about Spider's winnability at each rung: how many deals can be won in principle, what win rates players actually sustain, how much undo changes the picture, and why a single empty column is the most valuable object on the board.
Winnable in theory: almost everything
Start with the surprising fact: computer analyses of Spider indicate that the vast majority of deals are theoretically winnable at every suit count — including 4-suit, where solver studies put the share of winnable random deals well above 99%. A perfect player who somehow knew the location of every face-down card and every card waiting in the stock could win almost any Spider game you will ever be dealt.
No human plays that game. At the moment you make your first move, 44 of the 54 tableau cards are face down and all 50 stock cards are unseen — 94 unknowns out of 104. Every plan you make is provisional, every stock deal is a ten-card surprise, and in the multi-suit games a single wrong guess about what lies beneath a column can cost the whole hand. Spider's difficulty is not that deals are unwinnable; it is that the winning lines are hidden behind more unknown cards than any other popular solitaire.
Practical win rates: 1 suit vs 2 suits vs 4 suits
Because the theoretical ceiling sits near 100% everywhere, the interesting numbers are the practical ones — what players actually achieve. The figures below are approximate ranges drawn from solver research and large bodies of reported play; treat them as landmarks, not laws.
| Variant | Theoretically winnable | Typical win rate, no undo | With free use of undo |
|---|---|---|---|
| 1 suit (Easy) | Effectively all deals | ~50–75% | 90%+ within reach |
| 2 suits (Medium) | Nearly all deals | ~25–40% | Roughly double the no-undo rate |
| 4 suits (Hard) | Above 99% (solver estimates) | Single digits for most players | ~30% or more for disciplined experts |
Notice the shape of the table. Moving down a row barely touches the second column and devastates the third. Adding suits does not make deals unwinnable — it multiplies the ways a legal move can quietly poison your position. In 1-suit Spider, every descending stack is automatically a movable, suited sequence, so mistakes are nearly always recoverable. In 4-suit Spider, an off-suit placement freezes every card beneath it until you can unpick the stack, and ten new stock cards arrive before you are ready.
What undo is really worth
Undo changes Spider's odds more than it changes any other solitaire, and the reason is information. When you undo past a card flip or a stock deal in this game, the cards you saw stay seen — knowledge the original position never offered. Backing up five moves after a bad reveal effectively lets you replay the position with partial X-ray vision, which is why the with-undo column in the table above runs several times higher than the no-undo column at every suit count.
Whether that is "cheating" is a style question, not a rules question. Purists play no-undo and accept single-digit 4-suit win rates as the honest price of the hardest solitaire there is. Improvers use undo deliberately — testing whether a stock deal now or after one more rearrangement leads anywhere — and treat each deal as a puzzle to be solved rather than a hand to be survived. Both are legitimate ways to play; they just measure different skills, so keep your statistics consistent with one style if you want the win percentage to mean anything.
The empty column: Spider's most valuable square
Ask a strong Spider player to explain their win rate and they will talk about empty columns before they talk about anything else. An empty column is the only general workspace the game offers: it accepts any movable card or suited sequence, which makes it the tool for splitting mixed-suit stacks, rerouting a buried run, and reaching the face-down cards that decide the game.
Its value scales with suit count. In 1-suit play an empty column mostly buys speed. In 2-suit play it is your suit-sorting machine — the place where a spade run trapped under hearts gets rebuilt clean. In 4-suit play it is close to oxygen: with one open column you can usually untangle one bad stack per turn of the board; with two open columns you can relocate almost any realistic sequence; with none, you are often just waiting to lose. A useful habit at every level is to ask, before each move, whether it brings a column closer to empty or pushes one further away — and to remember that the stock cannot be dealt while any column is open, so an empty column also acts as a brake on dealing too early.
Why four suits is so much harder, in one card
The whole difficulty curve can be read off a single example. Suppose you are extending a spade run and need an 8 to continue it. Spider's 104-card deck always contains exactly eight 8s — what changes with the suit count is how many of them help you. In the 1-suit game, all eight copies are spades: any 8 you uncover extends the run. In the 2-suit game, four of the eight are spades, so half the 8s you dig up are the wrong kind — placeable, but a debt to unwind later. In the 4-suit game, only two of the eight 8s in the entire deck are spades, and one of them may be sitting under thirty cards or still buried in the stock.
Multiply that one-card arithmetic across every join in eight thirteen-card runs and the win-rate cliff between variants stops being mysterious. It also explains the standard strategic advice: in 4-suit Spider, a same-suit connection is four times scarcer than in the 1-suit game, so protecting the suited joins you already own — and refusing to bury them under convenient off-suit moves — is worth more than any clever individual play.
Reading your own numbers
The three difficulty settings here map straight onto the suit ladder — Easy deals 1 suit, Medium deals 2, Hard deals all 4 — and your statistics persist in the browser, so a few weeks of regular play gives you a genuine personal baseline. Against the landmarks above: winning two of three 1-suit games means you are ready for 2 suits; holding near 30% at 2 suits is strong club-level play; and any consistent win rate at all in no-undo 4-suit Spider puts you in rare company.
When the numbers stall, the fixes are almost always the same three habits, covered in depth in the strategy guide: open an empty column before the first stock deal, prefer same-suit builds even when an off-suit move looks convenient, and never deal the stock while a cheap reveal or a column-clearing move is still on the table. The rules guide covers the mechanics behind each one.
Find your rung on the ladder
The odds say almost every deal can be won — the suit count decides how hard you will have to work for it. Start where the wins come easily and climb.