Round Trip

A unit undergoes a sequence of moves, not necessarily consecutive, that returns to a square earlier visited. The length of the round trip is the maximum number of moves taken to return to an earlier square.

If the only square revisited is the initial square, and the route comprises at least 3 squares, then there is also the more specific term PURE ROUND TRIP.
If the piece goes out and returns by exactly the same path, then there is also the more specific term SWITCHBACK (including the simplest case of A to B and back to A).

E.g.: a1->b2->c3->b2->a1->d4->c3->b2.
Round trip length is 6 (starting and ending with b2)

The piece(s) that perform(s) a round trip are shown (in German letter symbols KDTLSBkdtlsb: upper case = white, lower case = black).
Round trips in different phases are separated by "comma". For example: Round Trip(K,k)
The length of the round trip may be shown as a number after the letter.

Call it a PROMENADE if the unit doesn't make its way back to the beginning.

In English, Circuit is sometimes used as a synonym for Round Trip, as in HOME CIRCUIT.

Compare with PURE ROUND TRIP and SWITCHBACK.