Simultaneous turn in a turn-based strategy game.

I can actually make my OХ code freely available. In reality, it's much easier to reverse engineer the barter code and integrate it with SOD than to write it from scratch based on my work. I'm glad that my ideas helped him implement OХ; he just should have asked me for the source code, and I would have given it to him for free, along with the source code for quick battles.