public void ApplyRule(AbstractCell cell, List<AbstractCell> neighbours)
{
if (cell == null)
throw new ArgumentNullException("cell");
if (neighbours == null)
throw new ArgumentNullException("neighbours");
int alive = neighbours.Count(neighbour => neighbour.IsAlive);
if ((alive == 2 && cell.IsAlive) || alive == 3)
cell.ShouldLive();
else
cell.ShouldDie();
}