June Challenge 2017
Chef and the Feast, Xenny and Coin Rankings, A Good Set
July Challenge 2017
Chef and Sign Sequences, Whats in the Name, Calculator
August Long Challenge 2017
Chef and Rainbow Array, Chef and Mover, Greedy Candidates
September Challenge 2017
Chef and Pick Digit, Minimum Good Permutation, Little Chef and Sums
October Challenge 2017
Max Mex, A Balanced Contest, Counter Test For CHEFSUM, Chef and a great voluntary Program
November Challenge 2017
Chef goes Left Right Left, Periodic Palindrome Construction, Villages and Tribes
December Challenge 2017
Chef And Easy Xor Queries
February Challenge 2019 Division 2
Chef and Magical Jars, Chef and Secret Ingredients, Appy and Contest, Deputy Chef
India