A lovely finish from Fabiano Caruana who is on 2/2 after today's second round at Dortmund.
White to play and win
Examine all biffs leads to 1 Re7!, noting that the Rg7 is LPDO, so the Bf7 is truly pinned.
If 1…Kb8, defending the pc7, then 2 Ba6 mates trivially. So 1..Qe7 when-still!- 2 Ba6! and Pono was kind enough to play 2…Ka6, permitting 3 Qa8 mate.