Tsume Othello #5622220 (empty 12)
To move: Black — find the best move
a
b
c
d
e
f
g
h
1
2
3
4
5
6
7
8
20 32
Why this move works
The answer is h8. It takes the corner (h8). Reading to the end gives a final +26 — a full 24 discs better than the next-best.
The move that flips the most right now is f2 (5 discs), but it is not best. A corner is a stable disc that can never be flipped back, so securing it far outweighs the immediate count.