monikrazy, on 2014-January-18, 12:13, said:
Perhaps this has changed in Max Hardy's most recent works but I have two books of his (2/1 revised expanded and Standard Bidding in the 21st Century) and his only mention of Walsh bidding is for Walsh Relays after 1NT opens.
Max Hardy passed away in late 2002. His last book, published in the year of his death, was Advanced Bridge Bidding for the 21st Century, the sequel to his penultimate book Standard Bridge Bidding for the 21st Century. Actually, the two volumes are one book, each chapter having been split and treated in the second volume as a continuation of the corresponding chapter in the first. Walsh responses are mentioned briefly on pp. 88-89 of the first volume, and in much greater detail on pp. 66 ff. of the second. 2/1 Revised and Expanded, if memory serves, was published in 1985 or thereabouts.