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This is Numberphile. We mainly post videos about mathematics and just numbers in general.

Secrets of 3-Board Tic-Tac-Toe

Secrets of 3-Board Tic-Tac-Toe

X-Only Misere Version!

Previous video: https://youtu.be/ktPvjr1tiKk
Extra discussion: https://youtu.be/v494yltz_7I

Featuring Thane Plambeck. More at: http://www.notakto.com (app based on this) and paper on the game and its mathematics: http://arxiv.org/pdf/1301.1672v1.pdf

Dots and Boxes: https://youtu.be/KboGyIilP6k
Connect Four: https://youtu.be/yDWPi1pZ0Po
Graham's Number: https://youtu.be/HX8bihEe3nA
Eight Queens: https://youtu.be/jPcBU0Z2Hj8
Knight's Tour: https://youtu.be/ab_dY3dZFHM

Correction from Thane: The configuration with two X's, one in a corner and one in the middle, is a "b" and not a "b^2". It's at 5:24 in the video.

Glitch Primes and Cyclops Numbers

Glitch Primes and Cyclops Numbers

Tic-Tac-Toe (with Xs only)

Tic-Tac-Toe (with Xs only)