“Up to this point White has been following well-known analysis, but now he makes a fatal error - he begins to use his own head.”
Concerning a World Chess Championship match, as quoted by William Ewart Napier in "The Bright Side of Chess" (1952) by Irving Chernev, p. 114
Help us to complete the source, original and additional information
Siegbert Tarrasch 10
German chess player, chess writer, and chess theoretician 1862–1934Related quotes

Speech http://hansard.millbanksystems.com/commons/1845/apr/11/maynooth-college in the House of Commons (11 April 1845).
1840s
Source: An Introduction to English Poetry (2002), Ch. 4: The Sense of Form (pp. 24-25)

Martin Seymour-Smith Guide to Modern World Literature (London: Hodder and Stoughton, 1975) vol. 4, p. 225.
Criticism

Maiam Magazine, in Kamal Hassan Biography http://www.imdb.com/name/nm0352032/bio

the first lines in 'Manifesto du Surréalisme', Andre Breton, 1924
Le Manifeste du Surréalisme, Andre Breton (Manifesto of Surrealism; 1924)
Note to the "Criticism" section
The Portable Matthew Arnold (Viking Press, 1949)

interview with Michael Parkinson (1974), quoted in Adam Lusher, " 'The white man is the devil' – what the Nation of Islam taught Muhammad Ali https://www.independent.co.uk/news/world/muhammad-ali-nation-of-islam-michael-parkinson-interview-who-were-elijah-muhammad-a7066301.html", _The Independent_ (June 5, 2016)