Weight two blocks of Iwahori–Hecke algebras of type B

In the representation theory of Iwahori–Hecke algebras of type A (and in particular for representations of symmetric groups) the notion of the weight of a block, introduced by James, plays a central rôle. Richards determined the decomposition numbers for blocks of weight 2, and here the same task is undertaken for weight two blocks of Iwahori–Hecke algebras of type B, using the author's own definition of the weight of a bipartition.