Shortest A-to-B Proof Games 4x4

Starting from diagram A, the two players cooperate to reach diagram B as quickly as possible. Black moves first, passing is allowed, and suicide is not allowed. In each problem the solution is unique.

A

B

Problem 1: shortest A-to-B proof game in 24 moves.

A

B

Problem 2: shortest A-to-B proof game in 24 moves.

• Attempts?
• Solution?