#1: Take with the queen
#2: Bf3#
#3: d7, then Kd6. Game over.
#1: Take with the queen
#2: Bf3#
#3: d7, then Kd6. Game over.
You are right with the first 2. Third is wrong.
1.d7 followed by 2.Ke7, not 2.Kd6, which isn't even legal after Black's only move, 1...Kc7
When in the Endgame, Always look for stalemating ideas whether if you are the attacking or defending player.
Don't stalemate black in these positions