UCVTS Puzzle 1

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jrb001
Find the fastest checkmate for white. 
The computer found mate in 4, but there is a faster one.
skinless_sloth

I got 1. e7 Kf5 2. Kf8 Kg6 3. e8=Q+ Kf5 4. Qe6# and 1.e7 Kf5 2. e8=R Kg6 3. Re6 Kf5 4. Rf6# but those are both 4 moves? I agree with computer it's 4

jrb001

There is actually a mate in 3! Hint: you never move the e6 pawn.

skinless_sloth

Update! 1. Be8 Kf5 2. Kg7 Ke5 3. Kg6#

jrb001

That's correct! I assume by Be8, you meant h8