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We prove a sharp Ore-type criterion for hamiltonicity of balanced bipartitedigraphs: A bipartite digraph D, with colour classes of cardinality N, ishamiltonian if, for every pair of vertices u and v from opposite colour classesof D such that the arc uv is not in D, the sum of the outdegree of u and theindegree of v is greater than or equal to N+2.

A degree condition for cycles of maximum length in bipartite digraphs