public int Score( IGrid<Player> board, Player player )
{
var result = 0;
foreach ( var p in board.AllPositions() )
{
var owner = board[p];
if ( owner != null )
{
var factor = owner == player ? 1 : -1;
var weight = Weight( board, p );
result = result + factor * weight;
}
}
return result;
}