December Challenge 2018 Division 2
Chef and Interactive Contests, Chef and An Ideal Problem
November Challenge 2018 Division 2
Chef and Difficult Contests
January Challenge 2019 Division 2
Lucky Number Game, Fancy Quotes
February Challenge 2019 Division 2
Chef and Secret Ingredients, Deputy Chef
February Cook-Off 2019 Division 2
Buying New Tablet, Chef and Party
February Challenge 2020 Division 2
School of Geometry, Hard Cash
January Cook-Off 2020 Division 2
Chef Chick, Exam Cheating
January Lunchtime 2020 Division 2
Bob and His Friends, Chef and Street Food, Under the Tunnels
UWCOI 2020 (Rated for all)
Button Pairs, Base Plans, Find maximum in an Array
June Challenge 2020 Division 2
Even Matrix, The Tom and Jerry Game!, Chef and Icecream, Chef and String, Chef and Price Control
India