September Challenge 2019 Division 2
Easy Fibonacci, Biladerim Icin, Fuzzy Linear Combinations, Chef Designed a Network, Chef and Interesting Subsequences , Chef and Good Subsequences
November Challenge 2019 Division 2
Physical Exercise, Hard Sequence, From Zero to Infinity, A Simple Game, Weapon Value, Chef and Minimum Colouring
April Challenge 2020 Division 2
Strange Number, COVID Pandemic and Long Queue, Leaked Answers (Challenge), Sell All the Cars, Unit GCD, Ready Bitwise, Squared Subsequences
September Challenge 2020 Division 1
Chefina and Swap, Chef and Trump Cards, Find XOR, Rotate the Polyline, Divide Candies, Ada Matrix
India