(related to Problem: The Eight Engines)
The solution to the Eight Engines Puzzle is as follows: The engine that has had its fire drawn and therefore cannot move is No. 5. Move the other engines in the following order: $7,$ $6,$ $3,$ $7,$ $6,$ $1,$ $2,$ $4,$ $1,$ $3,$ $8,$ $1,$ $3,$ $2,$ $4,$ $3,$ $2,$ seventeen moves in all, leaving the eight engines in the required order.
There are two other slightly different solutions.
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