Tsume Othello #5622223 (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
28 24
Why this move works
The answer is h3. Reading to the end produces a huge final +42 (4 discs better than the next-best).
The move that flips the most right now is a5 (3 discs), but it is not best. Immediate flips (h3 flips just 1) and the final result are different things — reading it out yields a big margin.