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To exchange the cars and return the engine
to its initial position 16 moves are required. Within the moves six*
couplings and uncouplings are performed. A move is either a
coupling/uncoupling or moving of an engine alone/with car(s) till the
moment it reverses its direction. The moves are shown in the
illustration. |
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* The improvement on the number of
required couplings and uncouplings, decreased from 8 to 6, has been
sent to us by Japhet Stevens. Many thanks! |
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Modified: February 23, 2010 | Posted:
June 9, 2004 |
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