Ayumu Hirano of Japan competes in the halfpipe competition of the Arctic Challenge at Oslo Winter Park near the Holmenkollen Ski Arena in Oslo March 9, 2013. REUTERS/Erlend Aas/NTB Scanpix (NORWAY - ... more 

Ayumu Hirano of Japan competes in the halfpipe competition of the Arctic Challenge at Oslo Winter Park near the Holmenkollen Ski Arena in Oslo March 9, 2013. REUTERS/Erlend Aas/NTB Scanpix (NORWAY - Tags: SPORT SNOWBOARDING) NORWAY OUT. NO COMMERCIAL OR EDITORIAL SALES INNORWAY. THIS IMAGE HAS BEEN SUPPLIED BY A THIRD PARTY. IT IS DISTRIBUTED, EXACTLY AS RECEIVED BY REUTERS, AS A SERVICE TO CLIENTS less