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Pure Round Trip

A unit undergoes a sequence of moves, not necessarily consecutive, that returns the unit back to a square earlier visited. The length of the cycle is the number of moves taken to return to an earlier square, with no squares revisited *during* the circuit, and should be at least 3 (else it's just A to B and back to A, and prefer SWITCHBACK).

E.g.: a1->b2->c3->b2->a1->d4->e5->c3->a1.
Circuit length is 5, starting from first visit to c3.

The piece(s) that perform(s) a cycle are shown (in German letter symbols KDTLSBkdtlsb: upper case = white, lower case = black).

Pure round trips in different phases are separated by "comma".
For example: Pure Round Trip(K,k)

Compare with ROUND TRIP and SWITCHBACK