June Challenge 2017
Chef and the Feast, Xenny and Coin Rankings, A Good Set
September Challenge 2017
Chef and Pick Digit, Minimum Good Permutation, Little Chef and Sums
October Challenge 2017
Max Mex, Counter Test For CHEFSUM, A Balanced Contest
November Challenge 2017
Chef goes Left Right Left, Villages and Tribes
October Cook-Off 2017
Chef and Counting Test, Chef and Weird Queries, Chef and Employment Test
September Lunchtime 2017
Chef and Dice, Chef and Cook-Off Contests
January Challenge 2018
K-Concatenation, Maximum Score, Rectangle, String Merging, Partition the numbers
February Challenge 2018
Chef And His Characters, Permutation and Palindrome, Chef And The Patents
September Mega Cook-Off 2018 Division 2
ATM Machine, Make a Permutation
April Challenge 2018 Division 2
Weight of Numbers, Average of Pairs, Workers
September Challenge 2018 Division 2
Magician versus Chef, War of XORs, Chef and Adventures
December Challenge 2018 Division 2
Chef and An Ideal Problem, Chef and Interactive Contests
November Challenge 2018 Division 2
Chef and Ridges, Appy Loves One, Good Median, Chef, Primes and Trees (Challenge), Chef and Difficult Contests, Chef and Happiness
October Challenge 2018 Division 2
Appy and Balloons , Chef and Serves
January Challenge 2019 Division 2
Distinct Pairs, Fancy Quotes
India