Proof is provided here for one of them: https://lichess.org/study/PLtuv3v5/zWPNxbSA https://lichess.org/study/PLtuv3v5/zWPNxbSA To be clear you're misunderstan

Proof is provided here for one of them: https://lichess.org/study/PLtuv3v5/zWPNxbSA https://lichess.org/study/PLtuv3v5/zWPNxbSA To be clear you're misunderstanding the position though. Black pawns are NOT in starting position. They've moved all the way across the board. Those are white pawn starting positions.