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Binairo

Blue and white circles: never three in a row, every line half and half.

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How to play

  • Put a blue or a white circle in every empty cell; the circles already there stay.
  • No three circles of one colour may sit side by side in a row or a column (diagonals don't count).
  • Every row and every column holds as many blue circles as white ones.

No Three in a Row

Two circles of one colour may sit side by side, but never three, across or down. Diagonals don't count.

✓ Correct Two blues side by side, then two whites: pairs are fine.
✗ Wrong Three blue circles in a row.
✗ Wrong Three white circles in a column: the rule holds down as well as across.

Half and Half

Every row and every column holds as many blue circles as white ones: a line of six has three of each.

✓ Correct A finished board: two of each colour in every row and column, and nothing three in a line (three on a diagonal is fine).
✗ Wrong Four blue and two white. No three touch, but a row of six needs three of each.
✗ Wrong The same goes down a column: this one has four blue.
A small Binairo, solved.

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