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 , IPC Trainers
August Long Challenge 2017
Chef and Mover, Greedy Candidates, Palindromic Game, Chef and Rainbow Array
October Challenge 2017
Chef and a great voluntary Program, Max Mex, Counter Test For CHEFSUM, A Balanced Contest
November Challenge 2017
Villages and Tribes, Periodic Palindrome Construction, Chef Hates Palindromes, Chef goes Left Right Left
October Lunchtime 2017
Buggy Calculator, Maximum Number
June Challenge 2018 Division 2
Vision, Sheokand and String, Binary Shuffle, Naive Chef
October Challenge 2018 Division 1
Beautiful Bricks, Byte to Bit, Chef and Serves, Chef and Surprise Chessboard, Minimize Digitsum, Appy and Balloons
June Challenge 2019 Division 1
Lent Money, Chef and Ingredients, Chef and His Dish, Intersecting Paths, Sum and GCD
Philippines