Tsume Othello #5622219 (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
26 26
Why this move works
The answer is f2. Reading to the very end, this move maximizes your final disc count (final +24, and 4 discs better than the next-best).
The move that flips the most right now is c8 (8 discs), but it is not best. In endgame othello what matters is the final count, not how many you flip immediately.