Strategy
Minesweeper Strategy & Tips
A practical Minesweeper strategy guide: opening theory, working the frontier, subset counting, using the mine counter, safe chording, and when a guess is genuinely forced.
Play MinesweeperThe core idea
Exhaust every deduction before you guess
Most Minesweeper losses are solvable boards where a resolving number was two or three squares from where the player was looking. Strong play is a discipline: read the entire frontier, apply the patterns, use the mine counter, and only then — if nothing is forced — take the smallest possible guess.
- 01
Open the middle first
A first click near the centre of the board opens a much larger area than a corner or edge click, because the safe zone around it is fully surrounded by more squares. More opened ground means more numbers, and more numbers means more forced deductions before you ever have to consider a guess.
- 02
Work the border, not the interior
Every deduction lives on the boundary between opened and covered squares. Scan that whole frontier for the number touching the fewest covered squares — a "1" next to a single covered square marks a mine; a satisfied "1" next to several covered squares clears all the rest.
- 03
Subtract overlapping numbers
When two numbers share some covered squares, compare them. If a "2" sees every covered square a neighbouring "1" sees, plus one extra, that extra square holds exactly one mine — and if the "1" is already satisfied, that extra square is the mine. This "subset" logic resolves positions that look ambiguous square by square.
- 04
Use the mine counter in the endgame
Late in a board the global count matters more than any local number. If the counter says two mines remain and a sealed-off pocket has exactly two covered squares, both are mines regardless of what the nearby numbers say. If it says zero, everything still covered is safe — chord or click freely.
- 05
Flag only to enable a chord
Every flag you place changes what the numbers around it appear to mean. A wrong flag turns a solvable board into a lost one and makes chording lethal. Place a flag only when a number has proven the square, and consider skipping flags entirely on wide-open areas where you can just read the numbers.
- 06
Chord to clear ground fast
Once a number has its full count of flags around it, clicking the number opens every other neighbour at once. On Intermediate and Expert this is where time is won or lost — resolving a number and immediately chording it clears far more squares per action than clicking one at a time.
- 07
Know when the guess is forced
Some positions genuinely have no deduction: two squares, one mine, no number distinguishes them. When that happens, prefer the guess that touches the mine counter maths in your favour, or the one that opens toward unexplored space rather than sealing a pocket. Then accept the coin flip and move on.
Patterns
The shapes worth memorising
These recur on every board. Learn to see them and you stop counting.
1-1 along a wall
Two 1s in a row against the edge of the opened area, both seeing the same run of covered squares: the square just past the second 1, away from the first, is safe. Each 1 is satisfied by the shared square between them.
1-2-1 on an edge
Three numbers reading 1-2-1 along a straight border of covered squares: the squares under the two 1s are mines, and the square under the 2 is safe. It resolves with no counting once you recognise the shape.
1-2-2-1
Along a border reading 1-2-2-1, the two middle squares (under the 2s) are mines and the two outer squares (under the 1s) are safe. A longer cousin of the 1-2-1 that shows up constantly on Expert.
Subset counting
When one number’s covered squares are entirely contained in another number’s, subtract. A "2" whose covered squares include every covered square of an adjacent "1" has exactly one mine in the squares the "1" cannot see.
By board size
How the approach shifts with density
The deductions are identical on every board. What changes is how often a guess is forced and how much speed depends on pattern recognition. See the how-to-play guide for the full rules.
Beginner (9×9, 10 mines)
Roughly 12% mine density — the most forgiving board and the best place to drill patterns. Almost every Beginner board is fully solvable; a loss here is nearly always a missed deduction, not bad luck. Use it to make 1-2-1 and subset counting automatic.
Intermediate (16×16, 40 mines)
About 16% density and the standard "real game". Openings are smaller, so you spend more time on the frontier. This is where chording discipline starts to matter: resolve a number, flag its mines, chord it, repeat.
Expert (16×30, 99 mines)
Around 21% density and wide enough to pan on a phone. The board is dense from the first click, forced guesses are more common, and speed comes almost entirely from pattern recognition and chording rather than careful counting.