作者：贡裾 发布时间：2019-03-01 09:14:16

By Keith Austin LAST week’s Noughts and Crosses Bugle had the following problem. “A game in which 0 began has reached the following position: X is now to go and win.” There were some 0’s and X’s in the diagram but I have forgotten where they were. This week’s Bugle says the solution is as follows: “X goes in f. After 0 has gone, at least one of e and i will be empty and X can go in either that is empty to complete a row.” What was the diagram in the original problem? A £10 book token will be awarded to the sender of the first correct answer opened on Wednesday 21 December. The Editor’s decision is final. Please send entries to Enigma 798, New Scientist, King’s Reach Tower, Stamford Street, London SE99 0BB. The winner of Enigma 793 was David Reader of Basingstoke, Hampshire. Answer to Enigma 793 Imaginary journeys Five journeys. Correction to Enigma 786 THE puzzle “Handshakes”, by Henry P. Dart III, as printed in the 3 September issue of New Scientist, lacks a key statement, namely,

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