Actually, I think it's good to remind ourselves of the basics of swarm prevention. I am very much of the view that we put too much emphasis on it. I am not one to encourage swarming but you no what, it's not worth getting so worked up about. It's natural reproduction so go with it if you are a back yard beek. I have huge respect for the late Walt Wright and I would be amazed if his articles had not been well read here in the UK. His method of checker boarding is, I believe, a well established practice of swarm prevention. However, beekeeping in Ecton TN, USA is very different to beekeeping in Teddington, Middlesex, UK. I just don't think checker boarding would work in the UK climate.