> In the history of sport — and publishing — it’s not even close: one sport has had more books (and for that matter, magazines, tracts, pamphlets and handbills) published about it far more than any other: Chess.

Source: [publishingperspectives.com][1]


I often hear, but have never seen justification for, the claim that there are more books published on chess than any other sport.

My questions are:

 1. Is this true?
 2. What are the origins of the claim?

  [1]: http://publishingperspectives.com/2015/09/chess-the-worlds-most-published-sport/#.V9Exz_krLrc