The boundary between Black's and White's territory is also
becoming clearer.
This is a scene that is almost at the end of the game.
Next is White's turn.
Think about where you can place a block to increase White's
territory.
Question 4-1
Where should White place a block to increase his territory?
4-1 F
When White places a block of "1-square",
Black places a block of "6-squares" to protect the inadequacy of
Black's territory.
White is a failure.
Next, even if White places a block of "1-square",
Black can place a block of "1-square".
4-1 S
White's sharp aim is to exploit the inadequacy of the Black’s territory and place a block of "3-squares".
Even if Black places a block of "3-squares" to prevent White's "boo",
White places a block of "6-squares" to prevent Black from making a "boo" as well.
Black places a block at White's "breathing point" to avoid "dead-end" shape.
White will place a block on the Black's "breathing points".
In addition, Black places a block on White's "breathing points" and
White places a block on Black's "breathing points".
Black places a block of "1-square".
Black can take away (capture) the white blocks, but
White could place a block of "1-square" to increase his territory.