Henry Ernest Dudeney/Puzzles and Curious Problems/263 - Footprints in the Snow
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Puzzles and Curious Problems by Henry Ernest Dudeney: $263$
- Footprints in the Snow
- Four schoolboys, living respectively in the houses $A$, $B$, $C$, and $D$, attended different schools.
- After a snowstorm one morning their footprints were examined, and it was found that no boy had ever crossed the track of another boy,
- or gone outside the square boundary.
- Take your pencil and continue their tracks, so that the boy $A$ goes to the school $A$, the boy $B$ to the school $B$, and so on,
- without any line crossing another line.
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Sources
- 1932: Henry Ernest Dudeney: Puzzles and Curious Problems ... (previous) ... (next): Unicursal and Route Problems: $263$. -- Footprints in the Snow
- 1968: Henry Ernest Dudeney: 536 Puzzles & Curious Problems ... (previous) ... (next): Combinatorial & Topological Problems: Route & Network Puzzles: $420$. Footprints in the Snow