October Challenge 2017
A Balanced Contest, Max Mex
November Challenge 2017
Chef goes Left Right Left, Periodic Palindrome Construction, Villages and Tribes, Chef Hates Palindromes
January Lunchtime 2018
Chef and Game with Sequence
April Challenge 2018 Division 2
Average of Pairs, Workers
August Challenge 2018 Division 2
Spell Bob, Sheokand and Number, Modular GCD, Problem Sort
December Challenge 2018 Division 2
Chef and Interactive Contests, Chef and An Ideal Problem
November Challenge 2018 Division 2
Chef and Ridges, Chef and Difficult Contests, Chef and Happiness
January Challenge 2019 Division 2
Chef and Modulo Game, Fancy Quotes, Distinct Pairs, Lucky Number Game, Different Neighbours
February Challenge 2019 Division 2
Chef and Secret Ingredients, Appy and Contest
September Challenge 2020 Division 2
A Problem on Sticks, Ada Matrix
January Cook-Off 2021 Division 3
Prime Tuples, Distinct Pair Sums, Maximise Islands, Password
India