Solution: The anticritical key 1.Bd7 threatens
2.Sg4 mate and forces 1...Be2. A second anticritical move
2.Re8 threatens 3.Se4 mate and forces 2...Bf3. Now
with the black bishop tied to e4 and g4 White simply needs a
waiting move to place Black in zugzwang, and there is one
available, namely 3.Bc8. Note that 1.Re8 works after
1...Bb7 2.Bd7 Bf3, but fails to 1...Bd3 2.Bd7 Bf5!