April Challenge 2017
Bear and Row 01, Similar Dishes, Dish Of Life
May Challenge 2017
Chef and his daily routine
June Challenge 2017
A Good Set, Xenny and Coin Rankings
August Long Challenge 2017
Chef and Mover, Greedy Candidates, Chef and Rainbow Array
October Challenge 2017
Max Mex, A Balanced Contest
November Challenge 2017
Chef Hates Palindromes, Chef goes Left Right Left, Periodic Palindrome Construction, Villages and Tribes
December Challenge 2017
Chef And his Cake, Penalty Shoot-out
March Challenge 2018 DIV 2
Minions and Voting, Minion Chef and Bananas, Chef and Glove, Mix the Colors, A Big Sale, Chef and Easy Problem
August Challenge 2018 Division 2
Modular GCD, Problem Sort, Sheokand and Number, Spell Bob
India