\begin{definition}[Definition:Fibonacci Nim]
'''Fibonacci nim''' is a two-person game whose rules are as follows:
:$(1): \quad$ The game starts with one pile of $n$ counters.
:$(2): \quad$ The first player removes a number of counters $c_1$ such that $1 \le c_1 < n$.
:$(3): \quad$ Each player takes it in turns to remove $c_n$ counters such that $1 \le c_n \le 2 c_{n - 1}$ where $c_{n - 1}$ is the number of counters taken in the other player's prevous move.
:$(3): \quad$ The person who removes the last counter (or counters) is the winner.
\end{definition}