Neil Sloane discusses peaceable queens and chess. Check out Brilliant (get 20% off their premium service): https://brilliant.org/numberphile (sponsor)
Learn more at the OEIS entry (loads of links): https://oeis.org/A250000
Ainley, Stephen. Mathematical Puzzles. London: G Bell & Sons, 1977.
Yukun Yao and Doron Zeilberger, Numerical and Symbolic Studies of the Peaceable Queens Problem, https://arxiv.org/abs/1902.05886
Other notable work by Michael De Vlieger, Benoit Jubin, Peter Karpov, Don Knuth, Rob Pratt, Bob Selcoe, Paul Tabatabai.
More Numberphile videos with Neil Sloane: http://bit.ly/Sloane_Numberphile
More chess-related videos: http://bit.ly/chess_numberphile