December Challenge 2018 Division 2
Max and Electrical Panel, Chef and An Ideal Problem, Chef and Interactive Contests
January Challenge 2019 Division 2
Yet Another Problem About Sequences, Different Neighbours, Lucky Number Game, Distinct Pairs, Chef and Modulo Game, Fancy Quotes, (Challenge) Chef and Matching Game, A Pizza Slice
February Challenge 2019 Division 2
Manhattan Rectangle, Guess It Right, Chef and Magical Jars, Chef and Secret Ingredients, Appy and Contest, Art of Balance, Deputy Chef
February Cook-Off 2019 Division 2
Chef and Secret Password, Buying New Tablet, Chef and Party
April Challenge 2019 Division 2
Fencing, Maximum Remaining, Friend or Girlfriend
April Cook-Off 2019 Division 2
Making a Meal, Chef Learning Hungarian Algorithm
May Challenge 2019 Division 2
Ada Rooks 2, Matches, Reduce to One, Where to Build the Roads
August Challenge 2019 Division 1
Guddu and his Mother, Dilemma, Maximize an Expression
September Challenge 2019 Division 1
Biladerim Icin, Chef Designed a Network
October Challenge 2019 Division 1
Chef and Maximum Star Value, (Challenge) Maximizing LIS, Array Modification, Even Edges
Dementia 2019 (Rated for Division 2)
When to take medicine, Maximum Scoring Position
January Challenge 2020 Division 1
Chef and Dynamo, Doraemon, Doofish Matrix, Chefina and Prefix Suffix Sums, English, Chefland Army, (Challenge) Building Anthills
July Challenge 2020 Division 1
Chefina and Swaps, Missing a Point, Doctor Chef
India