Âé¶¹´«Ã½

Enigma Number 1571

By Susan Denham

11 November 2009

Just ladders

I have designed a snakes and ladders board. It is a 10-by-10 grid numbered 1 to 10 from left to right in the bottom row, then 11 to 20 from right to left in the next row, 21 to 30 from left to right in the next and so on, ending at 100 in the top left-hand corner.

Each ladder is a thin straight line from the centre of one square up to the centre of another square. None goes up vertically and no two of the ladders touch or cross each other. If a ladder started, say,…

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