In principle a counterfactual analysis of causation is well placed to deal with chancy causation, since counterfactual dependence does not require that the cause was sufficient, in the circumstances, for the effect – it only requires that the cause was necessary in the circumstances for the effect. The problem posed by abandoning the assumption of determinism, however, is that pervasive indeterminism undermines the plausibility of the idea that – preemption and overdetermination aside – effects