Black can only draw by controlling the queening square.In this study by Centurini if it were White's move he would win quickly with 1. Be3 Bg3 2. Bb6 Bb8 3. Bd8 Ba7 4. Bc7. With Black to move he can get to the queening square but cannot maintain the position
1...Ka7
2.Be3+
Kb8
3.Bb6
Bf4
4.Bd8
Bg3
5.Kb6
Bf2+
6.Ka6
Be3
7.Bh4
Bf4
8.Bf2
Kc7
9.Ka7
Kd7
10.Ka8
Be5
11.Ba7
Bf4
12.Bb8
Be3
13.Bg3
wins *