**From The Sunday Times, 15th November 1964** [link]

**A** is 73 feet from a straight river, and **B** is on the same side of the river but not so far from it. **M** and **N** are the (distinct) points on the river nearest to **A** and **B** respectively. The lengths of **AB**, **MN**, and **BN** are whole numbers of feet.

A man walks from **A** to **B** via the river, taking the shortest possible route, and this is also whole number of feet.

How far does the man walk, and what is the direct distance from **A** to **B**?

This puzzle was included in the book **Sunday Times Brain Teasers** (1974, edited by Ronald Postill).

The puzzle is included as a postscript to the puzzles in the book, and the following text appears in the foreword:

Perhaps the most outstanding example of teasing is **Brain Teaser 186**, of 15th November 1964, which was based on a deceptively simple diagram by an undergraduate, Adrian Winder, who died in a road accident just before his puzzle was published. Few correct answers were submitted; within the year there were 250 requests for the full solution; and still, from time to time, yet another reader concedes defeat and begs to be relieved of his misery.

Mr Winder’s problem, with his solution, is published as a fitting postscript to this collection.

— Anthony French

This brings the total number of puzzles available on **S2T2** to 550, but this is less than 20% of the Brain Teaser puzzles published in *The Sunday Times*.

[teaser186]

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## Jim Randell 8:54 am

on4 December 2022 Permalink |(See also:

Teaser 119,Teaser 560).This Python program performs an exhaustive search of all possible stacks of blocks.

It runs in 268ms.

Run:[ @replit ]Solution:The pile of blocks (bottom to top) is one of the following two sequences:One being the reverse of the other.

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