Wythoff's Nim is simple game with some deep math lurking behind it.
Other game theory videos: https://www.youtube.com/playlist?list=PLH5zdqQODdBiGrWszPScMO2Dvp0Ix_vpV
Sections
0:00 Wythoff's Nim
1:37 P and N positions
3:58 Drawing a picture
5:32 Finding patterns
7:53 Beatty sequences
10:23 Differences
11:48 Putting it together
14:25 Rematch