Vom 16.11.2011-01.12.2011 veranstaltet der sebische Rätselverein den Optimier-Wettbewerb Novembarska Optimizacija.
INSTRUCTIONS: A tromino loop should be created in the grid so that ’straight‘ and ‚angular‘ elements change by turns. A loop cannot cut nor touch it self, and adjacent trominos must touch each other in the length of one field. Each tromino has to be an integral part of the loop with its full length. Tromonos should be marked with letters: “I“ for the straight and “V“ for the angular element.