October Challenge 2015
Count Subarrays, Who dares to be a millionaire, Rupsa and Equilateral Triangle, Time measure
April Challenge 2016
Help Watson Escape, Chef and Ballons, Chef And Magical Path, Chef And Coloring
May Challenge 2016
Chef and math, Chef and Balls, Forest Gathering, Chef and Big Soccer, Laddu
October Challenge 2017
Max Mex, Counter Test For CHEFSUM, A Balanced Contest
November Challenge 2017
Chef goes Left Right Left, Periodic Palindrome Construction, Villages and Tribes
March Cook-off 2018 Division 2
Chef Goes to the Cinema, Chef Restores a Matrix, Chef Judges a Competition
April Cook-off 2018 Division 2
Cut the Board, Binary Nim
April Lunchtime 2018 Division 2
Two vs Ten, The hardest gcd problem
India