Monte Carlo Solitaire

TSBy The Strategy Desk·Published April 5, 2026

Monte Carlo (also known as Weddings or Double and Quits) is a classic pair-matching solitaire played on a 5×5 grid. Deal 25 cards face-up, then remove pairs of same-rank cards that sit next to each other — horizontally, vertically, or diagonally. After removing all available pairs, consolidate the remaining cards and deal fresh ones from the stock to fill the gaps.

How Monte Carlo Works

The game starts with 25 cards in a 5×5 grid and 27 cards in the stock. Scan the grid for adjacent same-rank pairs and click both cards to remove them. When no more pairs exist, hit “Consolidate & Deal” to pack remaining cards together (shifting left and up) and fill empty spots from the stock. Repeat until all 52 cards are matched and removed, or until you're stuck with no pairs.

Strategy Tips

• Look for pairs near the edges first — they have fewer adjacency options after consolidation.
• When multiple pairs exist, prioritize removing those that will bring other same-rank cards closer together.
• Think ahead about what consolidation will do — sometimes waiting creates better adjacencies.
• Track which ranks still have un-removed cards to avoid dead ends.
• Remove pairs that free up the most space for new stock cards.

History & Origins

Monte Carlo is a late-nineteenth-century American pairing patience whose name pays tribute to the famous Mediterranean casino — a flourish typical of the Gilded Age parlour-game scene, when exotic place-names lent glamour to household diversions. Under its alternate titles Weddings and Double and Quits, the game appeared in American patience compilations in the 1890s and spread quickly because its rules could be summarised in a single sentence: remove pairs of equal rank that are adjacent in the grid, then consolidate. Monte Carlo's simplicity is its greatest virtue and its most famous trap. Players who learn the rules in ten seconds routinely lose dozens of deals before discovering how quickly a 5×5 grid turns into a dead end. The game remains a fixture of modern solitaire apps because its blend of approachable rules and deceptive depth has never been bettered by imitators.

Strategic Principles

Monte Carlo rewards players who look for multiple pairs at once. When two or three legal pair removals exist on the board, the order we execute them in shapes the next consolidation. We trace adjacencies forward: if we pull the top-left pair first, the cards that shift in will touch a very different set of neighbours than if we had pulled the bottom-right pair first. Elite play is essentially one-move-ahead simulation of every candidate pair.

Compressing the grid between moves is the central tactic. Because consolidation shifts cards left and up to fill empty squares, any pair we remove from the bottom-right corner has a large, rippling effect — the entire board re-flows. Pairs removed from the top-left corner barely move anything. Depending on what we want to achieve, this is either a tool for mixing or a way to preserve a delicate adjacency. When we already see a second pair locked in, we remove from the top-left to preserve it. When we need to churn the board, we remove from the bottom-right.

We also watch the stock count constantly. Twenty-seven cards sit in stock after the opening deal, arriving in predictable positions after each consolidation. Before committing to a removal, we ask whether the consolidation will produce empty cells that the stock will fill with duplicates of cards already on the board — those incoming duplicates create new pairs for free. A removal that turns the grid into a trap for incoming cards is worth several obvious pair pickups.

Difficulty & Win Rate

Monte Carlo has a famously volatile win rate. Because adjacency is so restrictive, some opening deals are essentially unwinnable — no amount of skill can produce a solution when the ranks cluster poorly. Across a large sample, win rates run from 10% to 20% depending on the deal. Skilled players drift toward the upper end of that range; casual players frequently sit near 5%.

The volatility is baked into the game's short grid. With only 25 visible cards at a time and eight possible adjacencies per card, we are always one bad consolidation from stalling out. That fragility is why Monte Carlo feels so different from Pyramid, another pairing game: Pyramid is about vertical access, while Monte Carlo is about the 2D topology of neighbours.

Common Mistakes

Players new to Monte Carlo grab the first pair they see, which is almost always wrong when multiple pairs exist. The game's depth is in pair order, not pair availability. A second frequent mistake is consolidating early — clicking the consolidate button as soon as one obvious pair disappears, rather than scanning the board exhaustively. Many legal pairs hide along the diagonals, and players who only scan horizontally and vertically routinely miss them.

Another recurring blunder is ignoring rank counts. Four of each rank exist in the deck, and each rank must leave in two pairs. If we remove a pair of Kings early and both remaining Kings end up in widely separated positions after several consolidations, we have built a deadlock. Players who track rank distribution across the board and stock play far better — we mentally partition the deck into “still out there” and “already paired” to avoid isolation traps.

A subtler mistake is failing to read the consolidation shape before committing. Because cards shift left and up, removing a pair near the right edge produces a long row-wise slide, while removing a pair on the left produces a short vertical lift. Experienced players visualise the exact grid that will appear after consolidation before choosing which pair to remove. Players who skip that visualisation step frequently create adjacencies they did not intend, and break adjacencies they needed.

How This Game Compares

Monte Carlo is the grid-based cousin of Pyramid and TriPeaks. Pyramid pairs cards to thirteen in a triangular stack; TriPeaks threads a waste pile through a three-peak layout; Monte Carlo pairs cards of equal rank across a two-dimensional grid. All three reward pattern recognition, but Monte Carlo is the only one where spatial adjacency is the puzzle. Compared to Gaps, Monte Carlo is less structured and more chaotic — Gaps fixes the layout and lets us slot cards deliberately, while Monte Carlo reshuffles the board after every sweep.

Players who enjoy Monte Carlo often try Accordion for a similarly compressive puzzle, or Clock when they want a quick, light pattern game between harder deals.

Variant Notes

The most famous Monte Carlo variant is Weddings, which is sometimes played with a 4×4 grid of sixteen cards — a harder, tighter puzzle that wins roughly 5% of the time. Some Victorian-era rulebooks permit removing pairs that sum to 13 instead of pairs of equal rank, producing a hybrid with Pyramid logic called Monte Carlo Thirteens. Modern digital versions occasionally allow diagonal-only adjacency or orthogonal-only adjacency as difficulty toggles; the classical rules, which we follow, permit both and therefore produce the most forgiving (though still challenging) game. A competitive two-player version called Double and Quits pits two players against identical deals and awards points for pairs removed before a deadlock, turning Monte Carlo from a solitaire into a head-to-head speed puzzle. The shared rules across all these variants are consolidation, adjacency-based removal, and rank-matching — with those three mechanics in place, Monte Carlo's character remains recognisable even as grid size and adjacency rules flex around it.

Learn More

• How to Play Monte Carlo — Complete rules and strategy guide
• Monte Carlo Strategy Guide — Tips and winning tactics
• Play Pyramid Solitaire — Another pair-matching solitaire (cards sum to 13)
• Play FreeCell — The classic free cell solitaire
• Types of Solitaire — Explore 20+ solitaire variants