Learning from tactics puzzles

Jolly Nepando v Galina Melnik
    - Olympiad (Women) 2016

When considering a tactics puzzle I often wonder how the position has been reached.

After thinking through the puzzle play through the game to see how the players reached the position & how the game ended.

White has just played 31 Ra1

😙  What is Black's best move in reply ?

 Hint        Solution         Play the game