Turing’s ‘Computing Machinery and Intelligence’ (1950) states his belief that in about fifty years computers will play the imitation game well enough that an average interrogator will have no more than a 70 per cent chance of right identification after five minutes, and that by the end of the century one will be able to speak of machines thinking without expecting to be contradicted.

One recorded claim. The claim panel gives its qualification, the source passages with their place in each source, and how it was checked.