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One free scan finds every outdated or missing driver and matches the right update for your exact hardware.Free scan · exact hardware matchTo find guaranteed safe moves in Minesweeper, treat every revealed number as a constraint: it tells you how many mines remain among its covered neighbours. Count what you already know, mark cells that are forced mines or safe, then repeat the count on nearby clues. Comparing overlapping clues can reveal deductions that are easy to miss. This method works whenever the board provides enough information—but classic Minesweeper can still reach positions where no safe move is logically certain.
Start with the numbers, not a memorized pattern
A clue counts mines in the cells touching it, including diagonals. For each clue, consider only its still-covered neighbours and subtract any mines you have already identified. The result is the number of mines that must still be in those covered cells.
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- If the remaining mine count is zero, every covered neighbour of that clue is safe.
- If the remaining mine count equals the number of covered neighbours, every one of those neighbours is a mine.
For example, if a 3 already touches two confirmed mines and has two covered neighbours left, exactly one of those two is mined; neither cell is individually determined yet. If instead it has one covered neighbour left, that cell must be a mine. After making a forced deduction, update the neighbouring clues and count again.
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When basic counting stalls, compare the covered-neighbour sets of two clues. If every covered cell counted by one clue is also counted by another, the smaller set is contained in the larger. Subtract the smaller clue’s requirement from the larger one to learn what the larger clue requires of its additional cells.
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Suppose one clue requires one mine among two covered cells, and a neighbouring clue requires two mines among those same two cells plus a third covered cell. The shared pair already account for one mine, so the extra cell must contain the other. This is subset reduction: it exposes a deduction without needing a named pattern. The Minesweeper Online patterns guide illustrates reduction, and Minesweeper Co-op’s drills teach it as a general rule.
Recognize edge patterns by their geometry
Pattern names are shortcuts for counting, not rules that apply to any sequence of numbers. First check which covered cells each clue actually touches. The following deductions apply to the standard straight-wall arrangements described.
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1-2 at a wall
In the common 1-2-X arrangement, the 1 and 2 share two covered neighbours, while the 2 also touches one extra covered cell beyond them. The 1 requires one mine in the shared pair. The 2 requires two mines across that pair and the extra cell, so the extra cell must be a mine. This is often called the 1-2-X rule. See the Minesweeper.org strategy guide and the Minesweeper Online guide.
1-2-1
In the standard wall layout, apply the 1-2 deduction from both ends. The two outer covered cells are mines, leaving the middle one safe. Minesweeper Co-op summarizes the drill solution as mine, safe, mine; the clue sequence alone is not enough unless the covered-cell arrangement matches. Practice the pattern.
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1-2-2-1
For the standard arrangement along a wall, deductions from both ends produce safe, mine, mine, safe across the four relevant covered cells. Confirm that the clues touch those cells in the assumed way before applying the result. The Minesweeper Online pattern guide, Minesweeper.org strategy guide, and Minesweeper Co-op drills describe this pattern.
1-1 along a boundary
In the standard 1-1-X arrangement, both 1s constrain the same two covered cells. Since those two cells already contain the one mine required by each clue, the extra covered cell touched only by the second 1 is safe. This is a form of border reduction, not a universal rule for every adjacent pair of 1s. See the strategy guide and pattern guide.
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Reduce before matching
A familiar pattern may become visible only after accounting for mines already established. Subtract those known mines from each clue, then compare the reduced requirements. The Minesweeper Online guide, for example, shows clues 2 and 4 reducing to 1-count constraints after known mines are accounted for; the resulting relationship exposes a safe cell. See the reduction examples.
When logic stops proving a safe move
Not every classic Minesweeper position has a guaranteed safe choice visible from the clues. A board can leave several layouts consistent with all the revealed numbers, with different covered cells mined in those layouts. In that situation, a move chosen without certainty is a guess. Minesweeper.org discusses logic-limited endgames, and an August 2008 Decision Analysis Newsletter article on Minesweeper and conditional probability explains why expert play can involve choosing among uncertain tiles.
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If you want to continue, compare the layouts consistent with the clues and choose the cell with the lowest mine probability when survival is your only goal. A reveal that would expose more useful information may also matter, depending on your objective. There is no universally best move without the board state and what you are trying to achieve.
Classic boards and no-guess modes are different
“No guess” is a property of a particular board generator, not a guarantee of Minesweeper as a whole. Minesweeper Co-op says its generator tests candidate boards with a solver that makes only moves it can prove safe, discards candidates that get stuck, and operates subject to an attempt limit and stated caveats. Its page reports these solvability rates for its own 20×16 boards; the page gives no publication year for the figures:
| Mine density | Share of candidate boards reported solvable | Source and qualification |
|---|---|---|
| 18.8% | 17% | Minesweeper Co-op’s 20×16-board generator; year not stated on page |
| 20.6% | 7% | Minesweeper Co-op’s 20×16-board generator; year not stated on page |
| 22% | 3% | Minesweeper Co-op’s 20×16-board generator; year not stated on page |
| 24% | 0.3% | Minesweeper Co-op’s 20×16-board generator; year not stated on page |
These are that service’s reported figures, not general rates for all Minesweeper games or generators. Its description also means the guarantee is bounded by that implementation’s solver, candidate checks, and attempt limit. Read the mode details.
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Practice deductions with feedback
Minesweeper Co-op offers untimed drills with one deduction per board and feedback about the rule used. Listed exercises cover direct counting, 1-1, 1-2, 1-2-1, 1-2-2-1, subset reduction, and applying patterns in a realistic-looking position. They provide a way to practice identifying the relevant geometry and constraints; the drills do not establish that practice guarantees improvement. Open the drills.
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