There are numerous versions of the code of the double dummy solver available. But my main goal was to replay and study hands, also for teaching, not using DDS, of course. I could not find code for that, nor a finished program that I would like. The BBO code or anything similar to that for playing and bidding is not available. Even if there was such a code, it is often much easier to write it yourself in a language you are familiar with. Plain vanilla Java is quite mighty and fast on C level with lots of internet resources. And it simply fun to do it your way. I was indeed dreaming of writing a robot to play against later. It would be a nice challenge. With a quick double dummy solver and some random analysis, it should not be too difficult to program an opponent who does not play double dummy. BBO did it that way. Extracting information from the bidding or the lead is the main difficulty here. For me, that is a slow and relaxed project after retirement. Seeing the little interest in my request, I see no reason to hurry the development. By the way, I think the main achievement of BBO is running a server. And making money with it, I should add.