X-Only Misere Version! More links & stuff in full description below ↓↓↓ Previous video: https://www.youtube.com/watch?v=ktPvjr1tiKk Extra discussion: https://www.youtube.com/watch?v=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://www.youtube.com/watch?v=KboGyIilP6k Connect Four: https://www.youtube.com/watch?v=yDWPi1pZ0Po Graham's Number: https://www.youtube.com/watch?v=HX8bihEe3nA Eight Queens: https://www.youtube.com/watch?v=jPcBU0Z2Hj8 Knight's Tour: https://www.youtube.com/watch?v=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. Support us on Patreon: http://www.patreon.com/numberphile NUMBERPHILE Website: http://www.numberphile.com/ Numberphile on Facebook: http://www.facebook.com/numberphile Numberphile tweets: https://twitter.com/numberphile Subscribe: http://bit.ly/Numberphile_Sub Numberphile is supported by the Mathematical Sciences Research Institute (MSRI): http://bit.ly/MSRINumberphile Videos by Brady Haran Brady's videos subreddit: http://www.reddit.com/r/BradyHaran/ Brady's latest videos across all channels: http://www.bradyharanblog.com/ Sign up for (occasional) emails: http://eepurl.com/YdjL9 Numberphile T-Shirts: null Other merchandise: https://store.dftba.com/collections/numberphile