Chording: The Fastest Way to Clear Minesweeper

If you've ever watched someone clear a Minesweeper board in seconds and wondered how their clicks reveal so much at once, the answer is chording. Minesweeper chording is a single move that opens every safe cell around a number in one go, and it's the difference between plodding through a board click by click and flying through it. It takes a few games to build the muscle memory, but once it's automatic you won't go back.

What chording is

Chording means clicking a revealed number with both mouse buttons at the same time (or the middle button, if your mouse has one). Instead of revealing a single cell, it reveals all the hidden, unflagged neighbors of that number at once.

On touch devices the equivalent is usually a tap on an already-revealed number, which our boards support. The idea is identical: one action, multiple cells opened.

The one rule that makes it safe

Chording is not a gamble. It only works correctly when you've told the game where that number's mines are. The rule:

The number of flags around a cell must equal the cell's number before you chord it.

When a 3 has exactly three flags around it, the game knows every remaining neighbor is safe, so chording reveals all of them instantly and correctly. Chord a number whose flags don't match and you'll either do nothing or, if your flags are wrong, detonate a mine. So chording leans on accurate flagging. Flag right, then chord.

Why it clears so much so fast

A single number can touch up to eight cells. Revealing them one at a time is up to eight clicks. Chording does it in one. Multiply that across a whole board and the time saved is enormous, which is exactly why it's the backbone of every fast solve.

Better still, each chord often triggers cascades. The cells it opens may be blanks, which expand automatically, so one chord on the right number can clear a large region in a single motion.

The flag-then-chord rhythm

Good players fall into a rhythm: flag the mines around a number, immediately chord it, watch the safe cells open, then move to the next number and repeat. Flag, chord, flag, chord. It turns solving into a flow instead of a series of careful single clicks.

This rhythm is why flagging and chording are best learned together. Flagging on its own is just bookkeeping. Paired with chording, every flag you place immediately pays off by unlocking a fast reveal.

When not to chord

A couple of cautions:

• Don't chord on uncertain flags. If you flagged a cell as a guess rather than a deduction, chording will reveal its neighbors as if that guess were fact, which can end your game.
• Don't chord a number that isn't satisfied. If the flags don't match the number, the move won't help, and fumbling both mouse buttons can lead to a misclick.

Used carefully, though, chording is pure upside. It's the technique that separates someone who knows Minesweeper from someone who just plays it. Once your pattern reading is quick enough to flag with confidence, chording turns that knowledge into speed.

Try it on a medium board: flag a satisfied number's mines, then click it with both buttons and watch the neighborhood open. After a few games the move will feel like second nature.