Great article. If I may presume to add something, I think point 6 (strongest possible counterargument) is a special case of a more general idea: thinking strategically. I also learned that from chess BTW. Whether you're talking about arguments or fixing a bug or planning a career, there's often a huge branching tree of possibilities - things you might do, things others might do, things that might happen because that's how the environment works. Learning to look ahead, apply pruning, etc. to find the best "move" at each point in time can be very valuable. So can prioritization, responding to a setback, and so on - which you can also learn from chess or other games. Not everything is a game, of course, but the strategic thinking that they encourage is very broadly applicable.