Math Club (May) : Fibonacci Numbers (Patterns, Puzzles and Geometry)

Challenge 2: 20 stones

20 Pebble Tinies Miniature Pebbles Tiny Craft Stones Bulk | Etsy |  Miniatures, Pebble art, Pebbles

Try playing the game in different ways with a pile of 20 stones. What will be the winning strategy in this case? Should you take the 1st turn or the 2nd turn? Why?