May Challenge 2017
Courses in an university, Chef and his daily routine, Median of adjacent maximum numbers
June Challenge 2017
A Good Set, Chef and the Feast, Xenny and Coin Rankings, Pairwise union of sets
July Challenge 2017
Chef and Sign Sequences, Whats in the Name, Calculator
August Long Challenge 2017
Chef and Rainbow Array, Chef and Mover, Palindromic Game, Greedy Candidates
October Challenge 2017
Max Mex, A Balanced Contest
November Challenge 2017
Villages and Tribes, Periodic Palindrome Construction, Chef goes Left Right Left
December Challenge 2017
Total Diamonds, Chef And his Cake, Penalty Shoot-out, Chef and Hamming Distance of arrays
September Cook-Off 2017
Statistics Construction, Subsequence Equality
August Lunchtime 2017
Mathison and the Dynamo shuffle, Mathison and pangrams
September Lunchtime 2017
Chef and Cook-Off Contests
February Challenge 2018
Chef And His Characters, Chef And The Patents, Car-pal Tunnel, Permutation and Palindrome
June Challenge 2018 Division 2
Binary Shuffle, Naive Chef
India