Tsume Othello #5621982 (empty 8)
To move: Black — find the best move
a
b
c
d
e
f
g
h
1
2
3
4
5
6
7
8
24 32
Why this move works
The answer is h8 — a corner. A corner can never be flipped back, so it becomes a permanent disc; here it leads to a +48 final margin (2 ahead of the next-best).
g8 flips a huge 10 discs immediately, yet it is not best. This problem shows that securing an unflippable corner is worth more than flipping the most discs.