  Given a finite set of positive integers, $A$, and starting with a heap of $n$
chips, Alice and Bob alternate turns and on each turn a player chooses $x\in A$
with $x$ smaller or equal than the current number of chips and subtract $x$
chips from the heap. The game terminates when the current number of chips
becomes smaller than $\min\{A\}$ and no moves are possible. The player who
makes the last move is the winner. We can define $w^A(n)$ to be $1$ if Alice
has a winning strategy with a starting heap of $n$ chips and $0$ if Bob has a
winning strategy. By the Pigeonhole Principle, $w^A(n)$ becomes periodic, and
it is easy to see that the period length is at most an exponential function of
$\max\{A\}$. The typical period length is a linear function of $\max\{A\}$, and
it is a long time open question if exponential period length is possible. We
consider a slight modification of this game by introducing an initial seed $S$
that tells for the few initial numbers of chips whether the current or the
opposite player is the winner. In this paper we show that the initial seed
cannot change the period length of $w^A(n)$ if the size of $A$ is $1$ or $2$,
but it can change the period length with $|A| \geq 3$. Further, we exhibit a
class of sets $A$ of size $3$ and corresponding initial seeds such that the
period length becomes a superpolynomial function of $\max\{A\}$.
