Binairo · strategies

Four scans, no guessing.

Every Binairo solves with four repeating patterns. Cycle through them and the grid falls.

Doubles

Two of the same symbol together — the cells on both sides must be the opposite (three-in-a-row is illegal).

Two O's together force an X on each side (green) — otherwise you'd make three in a row.

Sandwich

A gap between two matching symbols must hold the opposite — filling it the same way would make a triple.

A gap between two X's must take an O (green) — matching would make X X X.

Line counting

Each line holds equal O’s and X’s. When one symbol hits its quota (size ÷ 2), every remaining cell takes the other symbol.

A 6-line needs three O's and three X's. With all three O's placed, every open cell is X (green).

Uniqueness scan

No two rows (or columns) may be identical. If a nearly-complete line would duplicate a finished one, its open cells must break the match. Compare lines that share the most symbols first.

Row B's open cells can't repeat the finished row A, so they must fill X O (green).

Order of attack

Doubles and sandwiches first (pure local scans), then count any line missing one or two cells, then uniqueness last — it’s rarer but unlocks endgames.

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