August Long Challenge 2017
Chef and Rainbow Array, Strings and Graphs, Greedy Candidates, Palindromic Game, Chef and Mover, Chef And Fibonacci Array, Hill Jumping
October Challenge 2017
Chef and Magic Arrays, Chef and a great voluntary Program, Chef and Cycled Cycles, Max Mex, Counter Test For CHEFSUM, A Balanced Contest
November Challenge 2017
Periodic Palindrome Construction, Villages and Tribes, Chef goes Left Right Left
July Cook-Off 2017
Chang and Bitwise OR, Chang and the Perfect Function, Chang and Perfect Quadruples
August Cook-Off 2017
Game on Stick, Real obtuse, From heaven to earth
August Lunchtime 2017
Mathison and the Dynamo shuffle, Mathison and pangrams
February Lunchtime 2018
Prefix borders, Game with numbers, Jumping in the hills
March Challenge 2018 DIV 1
Chef and Easy Problem, Mix the Colors, Minions and Voting
October Challenge 2018 Division 2
Chef and Surprise Chessboard, Chef and Circles, Byte to Bit, Chef and Serves, Minimize Digitsum, Beautiful Bricks, Appy and Balloons
August Challenge 2019 Division 2
Guddu and his Mother, Encoding, Dilemma, Chef and Gordon Ramsay, Football, Distribute Apples, Zombie and the Caves
October Challenge 2019 Division 1
Chef and Maximum Star Value
Vietnam