September Challenge 2016
Chef and digits of a number, Faded Palindromes, Chef and calculation
October Challenge 2016
Chef and Keyboard, Chef and Three Dogs
January Challenge 2017
Capital Movement, Cats and Dogs, Reservior
May Challenge 2017
Courses in an university, Median of adjacent maximum numbers, Blocked websites, Chef and his daily routine
June Challenge 2017
A Good Set, Chef and the Feast, Xenny and Coin Rankings, Triplets, Pairwise union of sets
August Long Challenge 2017
Chef and Rainbow Array, Chef and Mover, Palindromic Game, Greedy Candidates
July Cook-Off 2017
Chang and Bitwise OR, Chang and the Perfect Function
India