A one-sided limit order book is modeled as a noncooperative game for n players. Agents offer various quantities of an asset at different prices p ∈ [0, P ], competing to fulfill an incoming order, whose size X is not known a priori. Players can have different payoff functions, reflecting different beliefs about the fundamental value of the asset and probability distribution of the random variable X. In [4] the existence of a Nash equilibrium was established by means of a fixed point argument.The main issue discussed in the present paper is whether this equilibrium can be obtained from the unique solution to a two-point boundary value problem, for a suitable system of discontinuous ODEs. Some additional assumptions are introduced, which yield a positive answer. In particular, this is the case when there are exactly 2 players, or when all n players assign the same exponential probability distribution to the random variable X. A counterexample shows that these assumptions cannot be removed.