Updated: Aug 2, 2021
This one is not as difficult as the the last bishop trap. See if you can find how black can trap white's bishop in the following position. The trap is also known as the Noah's Ark trap. I suppose this is because the bishop gets stranded on a pawn mountain of sorts (your clue). Black to move and trap the b3 bishop in two moves. Good luck!
1. e4 e5 2. Nf3 Nc6 3. Bb5 a6 4. Ba4 b5 5. Bb3 Nf6 6. O-O Be7 7. d4
exd4 8. Nxd4 Nxd4 9. Qxd4