Is this position legal?

Can't see 32.5 without option to promote the white a-pawn.

You can do it!

Oops! There is still another way to turn more (complications) into less (moves). Now I really must get thinking.

It is really grinded right now.

Nice! Promoted queen is a nice touch!

Yep! Also succeeded in making good use of the passive white a-pawn.

Now, how about that bishop one? I managed 52 moves on it. Could you make it in less than 50 moves?

Don't know. Must sleep now. Think about it tomorrow, time permitting.

That’s fine. Sleep well!

Illegal as the black black bishop on d8 couldn’t have possibly gotten there.

@RewanDemontay Tried my best 

Holy $#!+ this is amazing! Wonderful job! Brave bravo!

Thx! The secret is to try and let your pawns promote on the squares closest to their final destination.

Yep!

I have a another challenge for you if you wish to do it: https://chess.stackexchange.com/questions/24088/what-are-the-shortest-possible-games-with-a-20-bishops-b-20-knights-and-c-2

I found games with 52 moves each to get to 10 rooks, 10 bishops, and 10 knights per side. Perhaps you could find faster?

I just want to see someone solve this one...

I can do it!

It’s clearly impossible as there is no way for the black king to have reached the back rank!

Buuuutt, suppose we want the closest possible legal position. Here’s one long winding road to such a position.

Thanks, but the buck stops here for me. I do solve SPGs (shortest proof games) but they are composed as such and have very precise move-by-move solutions. The loose proof games with many options and move orders are for occasional fun but not really my thing. In truth, they are also quite easy compared to the formal SPGs which keep me engaged for days or weeks on end.