We present evidence that the CHL string in eight dimensions is dual to F-theory compactified on elliptic K3 with a ro(2) monodromy group. The monodromy group ro(2) allows one to turn on the flux of an antisymmetric two form along the base. The B^js flux is quantized and therefore the moduli space of the CHL string is disconnected from the moduli space of Ftheory/Heterotic strings (as expected). The non-zero B^ flux obstructs certain deformations restricting the moduli of elliptic K3 to a 10 dimensional moduli space. We also discuss how one can reconstruct the gauge groups from the elliptic fibration structure.
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Bershadsky et al. (1999) studied this question.
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