  Fibonacci nim is a popular impartial combinatorial game, usually played with
a single pile of stones. The game is appealing due to its surprising
connections with the Fibonacci numbers and the Zeckendorf representation. In
this article, we investigate some properties of a variant played with multiple
piles of stones, and solve the 2-pile case. A player chooses one of the piles
and plays as in Fibonacci nim, but here the move-size restriction is a global
parameter, valid for any pile.
