During World War II he participated in the 1941 "World Cup" in Cortina d'Ampezzo that was not subsequently approved by the FIS because many nations opposing the war were absent. At this event, Chierroni won the gold medal in slalom.[3]
National titles
Chierroni won 14 medals (10 wins) at the Italian Championships: 6 in downhill, 5 in slalom and 3 in combined.
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