title: Determining Stable discs in Othello
body: <p>I'm trying to determine which discs of an Othello board are stable ones (those that can't be flipped for the rest of the game).</p>
  <p>I've read that the disc needs to be stable in all four directions (horizontally, vertically and both diagonals). For it to be stable in any direction, either the direction is full of discs so that no more can be placed in that direction, it is on the edge of the board, or <strong>it is adjacent to a stable disc of the same color</strong>.</p>
  <p>I understand the first two parts, but is there a specific order in which I need to evaluate the stability of discs, because there could be a chain reaction that induces stability.</p>