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 06-12-2021 Sergej Yushkevitch:
A.v.d.Elzen made it earlier, see here: https://toernooibase.kndb.nl/applet/oerterpapplet2.0/get/composition/inputFindPosition.php?taal= (but in the problem of A.v.d,Elzen there is pos. BO: 26). So, it seems, the optimal name for this problem would be: "L.Colier (arrangement of W.Jurg)"