August Long Challenge 2017
Chef and Mover, Palindromic Game, Greedy Candidates, Chef and Rainbow Array
October Challenge 2017
Max Mex, Counter Test For CHEFSUM, A Balanced Contest
January Challenge 2018
K-Concatenation, Maximum Score, Rectangle, String Merging, Partition the numbers
January Lunchtime 2018
Chef and Game with Sequence
February Challenge 2018
Chef And His Characters, Chef And The Patents, Car-pal Tunnel, Permutation and Palindrome
March Challenge 2018 DIV 2
Chef and Easy Problem, A Big Sale, Mix the Colors, Chef and Glove, Minions and Voting, Minion Chef and Bananas
March Cook-off 2018 Division 2
Chef Goes to the Cinema, Chef Judges a Competition, Chef Restores a Matrix
July Challenge 2018 Division 2
No Minimum No Maximum, Magic Set, Strike or Spare, No Strings Attached
October Challenge 2018 Division 2
Byte to Bit, Chef and Circles, Chef and Serves, Chef and Surprise Chessboard, Minimize Digitsum, Appy and Balloons
Encoder (Rated for Division 2)
Knight Chess, Paint the Wall
January Challenge 2019 Division 2
Lucky Number Game, Distinct Pairs, Chef and Modulo Game, Fancy Quotes
February Lunchtime 2019 Division 2
Average Number, The Tricky Deal
India