At the very end of a book titled "Computer Chess", published 1975, there is a page that says "Stop the presses!" and it goes on to tell about how after the book was finished there was an article published in Scientific American regarding a new computer chess program written at M.I.T.
Supposedly the chess program would learn from its mistakes and they left it running - playing itself for 7 months. After which they asked it to draw conclusions... Among them was that 1. a4 is a win for white. According to the author of the book (or probably the author of the article in Scientific American) all lines stemming from 1. a4 ends up with white having such a strong positional advantage for white that most Grandmasters would recommend resigning.
This addendum also said that Bobby Fisher, shortly after the publication of the Scientific American, said he had an ilrrefutable response to 1. a4 and he would demonstrate it for 25 million dollars.
The article finished by talking about how there were all these threats and bribes to have the program and the data it created destroyed. It also said that there was going to be various meetings in Russa about how this will affect the future of chess.
Of course, the paper, by Martin Gardner was published in the 1975 April edition of Scientific American (pages 126-133). It was an April Fools joke.