And they play it at Takadanobaba station which located in the area where Osamu Tezuka, the creator of Astro Boy, had his studio. (There is also a huge mural under the railway bridge outside featuring all of his characters)
101 karma · joined March 23, 2018
There is a free trial (in Japanese) at http://maoh.dengeki.com/try/bunburyoutou/index.html but that is geoblocked an image search using the kanji above should give you the idea.
Basically the author took the idea of chess boxing and then let his imagination run wild. For example: In one contest the fighters competed to factor a series of increasingly large numbers, with the winner getting the sum of the factors in seconds for a free attack on their opponent.