Originally posted by Mephisto21.a4 b6 2. a5 Bb7 3. a6 Qc8 4. axb7 a6 5. b7xc8#
Another one for the less esperienced:
White checkmates in 5 (i.e. black plays only 4). How did the game go?
ps. SPG = Shortest Proof game, meaning the position could also be reached after a longer game.