He's using some good philosophy towards introducing concepts:
- Examples come before the abstractions. It's easier to motivate the abstract notions once you've seen some concrete examples.
- Delay notation as long as possible. The non-standard notation used while still showing the initial concepts works just fine. For example, instead of using N and P (outcome classes), the impartial videos start off with just checkmarks (for N-positions) and circles (P).
Here's the sequence on partisan games. I haven't watched as many of these yet.
These are a great resource for introducing CGT. I'd really like to know how effective these are in a classroom setting (at any level).