Double Bishop
It's White turn to move, find the minimum number of moves for White to move to win the game.
Note that both players played optimally and that Black moves down (pawn) and that Black intends to stay in the game for as long as possible.
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2 solutions
Moderator note:
I love how you restrict all of Black's movement to one possible move. Great puzzle!
It would be better to clarify why Black moves to b1 instead of a3 in step 15.
Translate Bahasa Indonesia,
1.Bg5+ | Kb1
2.Bh6 | b5
3.Kf7 | b4
4.Kf6 | b5
5.Kg5 | Kc1
6.Kf5 | Kb1
7.Kf4 | Kc1
8.Ke4 | Kb1
9.Ke3 | Kc1
10.Kd3 | Kb1
11.Bd5 | b3
12.Bxb3 | b4
13.Bd5 | b3
14.Kc3 | Ka2
15.Bxb3+ | Kb1
16.Be3 | h5
17.Bd5 | h4
18.Kb3 | h3
19.Be4#