A quiet move exposes few of your own discs toward empty squares. If you flip inner discs that are already surrounded by discs, the opponent's discs outside remain and keep serving as footholds for your next moves. Here we count your frontier discs (discs next to empty squares), including those on the edges.
Exercise
White to move. Find the move that leaves you the fewest frontier discs right after you play. If several moves share the same value, all of them are correct.
Exercise
White to move. Find the move that leaves you the fewest frontier discs right after you play. If several moves share the same value, all of them are correct.
Exercise
White to move. Find the move that leaves you the fewest frontier discs right after you play. If several moves share the same value, all of them are correct.
Exercise
Black to move. Find the move that leaves you the fewest frontier discs right after you play. If several moves share the same value, all of them are correct.
Exercise
Black to move. Find the move that leaves you the fewest frontier discs right after you play. If several moves share the same value, all of them are correct.