A line-piece should come to thematic line beyond the critical square. To accomplish this it first makes a move along the parallel line and by-passes the critical square, i.e. it makes a peri-critical move.
Complete Herlin maneuver: The unit that will be interfered with starts its maneuver from the thematic line.
Alias: Pericritical Indian.
Die Schwalbe, 1947
Magyar Sakkvilág, 1934
Die Schwalbe, 1988
The Problemist Supplement, 2022