Henry Ernest Dudeney/Puzzles and Curious Problems/263 - Footprints in the Snow/Solution

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.

Solution

Sources

• 1932: Henry Ernest Dudeney: Puzzles and Curious Problems ... (previous) ... (next): Solution: $263$. -- Footprints in the Snow
• 1968: Henry Ernest Dudeney: 536 Puzzles & Curious Problems ... (previous) ... (next): Answers: $420$. Footprints in the Snow