Correct answers:

• b9-a9, h5-h2
• c3-a5, h5-h2

Black’s tzaar stack at i4 is in a vulnerable spot: it is largely isolated and shielded from White’s taller tzaar at e8 only by the tzarra on h5. The right plan for White is to move that tzarra off the attack line (h5-h2), exposing the vulnerable stack for a capture on the next turn.