September Challenge 2017
Minimum Good Permutation, Chef and Pick Digit, Little Chef and Sums
October Challenge 2017
Max Mex, A Balanced Contest
November Challenge 2017
Periodic Palindrome Construction, Villages and Tribes
September Lunchtime 2017
Chef and Cook-Off Contests
February Challenge 2018
Chef And The Patents, Permutation and Palindrome, Chef And His Characters
March Challenge 2018 DIV 2
A Big Sale, Mix the Colors, Chef and Glove
September Mega Cook-Off 2018 Division 2
ATM Machine, Make a Permutation
April Challenge 2018 Division 2
Workers, Count Good Prefixes
June Challenge 2018 Division 2
Binary Shuffle, Naive Chef
July Challenge 2018 Division 2
Magic Set, Strike or Spare
August Challenge 2018 Division 2
Sheokand and Number, Spell Bob
September Challenge 2018 Division 2
Magician versus Chef, War of XORs, Chef and Adventures
December Challenge 2018 Division 2
Chef and Interactive Contests, Chef and An Ideal Problem
November Challenge 2018 Division 2
Chef and Difficult Contests
August Lunchtime 2018 Division 2
Chef and Problem Setting, Chef and Eid
Dementia (Rated for Division 2)
Strings, Chef and Replication
July Challenge 2019 Division 2
Minimum and Maximum, Chef and Mean
September Challenge 2019 Division 2
Chef and Good Subsequences, Easy Fibonacci, Chef Designed a Network, Chef and Interesting Subsequences
India