Strachey's copy of his letter to A.M. Turing, 15 May 1951. Written immediately after hearing Turing's talk 'Can Digital Computers think?', broadcast on BBC Third Programme on same day. In his letter Strachey discusses the general problems of 'thinking machines', their application to the Manchester machine, and his modification of his ACE draughts program.

Note: The original of this letter is in the manuscript collection of A.M. Turing in King's College, Cambridge. (GBR/0272/PP/AMT, Item D/5.