Originally posted by Tetsujin
It works easily if black doesn't even start with a bishop.
Perhaps, the player just took it off the board, or they agreed to the handicap?
This isn't a Bowmann problem.
Been trying a few ways of getting this done.
White moves 6P, 5K, 2B leaving 8 for the rook.
So it can go from h1 to h4/h5 (not sure which but leaning towards h5), then to a4/a5, a8 and f8 before returning. Which is all of his accounted for.
So black has a minimum of three pawn moves (to b4 and a5), the rest to shuttle his pieces out and back again. So max of 18 to do this, or 9 each way. K min 3, Q min 2, so four for B,N,R. Because the rook can't get past the a-pawn, he must move twice, so the B is only allowed one move (to a6 - the K must take b7), ditto the N to c6.
And my big problem at the moment is that I think the b pawn must get to b4 before the black pieces can move out, however this blocks the white K through c3, so can't take place before the 5th move. K to c3, pawns to e3/b3. a5, b5, Nc6 and Rb8 needed first