Deductive Puzzle #16

As you can see, White has two light colored Bishops! Which is original and which is promoted?

White's only missing pieces: dark squared bishop and g-pawn (which is now a bishop)

From a quick look, it seems that a2 has to be original, because before white can promote, the dark squared bishop has to escape and be captured on f6. This can oly be done by b3, which would exclude any bishop from getting in. Therefore the original bishop is tucked into a2, black captures on f6, white promotes and brings bishop to g2. 

The return of deductive puzzles! Yes!

• Alright, the first thing to notice is that white's g-pawn was what promoted.

• The a2 bishop reached that square before the b-pawn reached b3.

• Only one white piece is missing - the dark-squared bishop, which must have been captured on f6 by black's g-pawn.
• Black is missing the dark-squared bishop and both rooks
• The c8 bishop hasn't moved
• The black queenside rook couldn't have gotten out of the three squares a7, a8, and b8, on one of which it must have been captured.
• The pawn must have promoted on g8 (unless I'm mistaken, it can't have reached any other light-square for promotion), then gone to h7 and escaped from there.

And bondiggity beat me to it whilst I was typing, as well as finding the solution really quickly. Nice, simple puzzle

Sorry, I just love these puzzles 

simple puzzles are fun