How to play Reversi

Begin with four discs in the centre: two black and two white, with matching colours diagonally opposite. The remaining sixty squares are empty. Each move places one new disc.

• ◐

  Opening

  Four discs start in the centre. Black moves first.

• ●

  Place a disc

  Every move must trap at least one opposing disc.

• ⇆

  Flip discs

  Flip all trapped discs horizontally, vertically and diagonally.

• →

  Pass

  Pass only when you have no legal move.

• ⌜

  Corners

  A disc in a corner can never be flipped.

• =

  Finish

  When neither player can place a disc, count both colours. More discs wins; equal counts draw.

Place a disc to bracket one or more opponent discs between it and a friendly disc along a straight line. Every bracketed line flips at once. A placement without a capture is illegal.

Pass only when no placement is legal. The game ends when neither player can place, even with empty squares remaining. The larger disc count wins.

Corners cannot be flipped once taken. Avoid giving away a corner just to flip many discs early; the final count decides the game.