They were married

This is an excerpt from his former lawyer John Bosnitch on ChessBase

“During the course of his defense, Bobby agreed that it was time to publicly recognize his de facto marriage with Miyoko Watai, with whom he had been living in common law for years. I was the male witness to that marriage and the marriage certificate bears my name. The fact that the U.S. had illegally seized Bobby’s passport was initially an impediment to getting the Japanese to register the marriage, but after we argued that the illegal seizure of his passport violated his human right to marry, the Japanese authorities eventually issued a marriage certificate and duly registered the legal union, upon certifying his identity by other means. (They ultimately had no option but to do so, after we correctly established that the only reason a passport was normally required was to certifiably attest to the identity of a person seeking marriage and that such requirement was unnecessary as the Japanese government was only able to hold him in prison because it was already certain of his identity as confirmed by the U.S. government in its request for his extradition. Simple logic dictated that the Japanese had to recognize the marriage because they knew without any doubt who he was.)”