September Cook-Off 2016
The Lost Arithmetic Sequences, Lazy Jem
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
Chef Hates Palindromes, Chef goes Left Right Left, Periodic Palindrome Construction, Villages and Tribes
October Lunchtime 2017
Buggy Calculator, Maximum Number
January Lunchtime 2018
Chef and Game with Sequence, Chef and Escaping from the Labyrinth
May Lunchtime 2018 Division 1
Sum on Tree, Count Substrings, Shifted Palindrome, Weak in the Middle, Maximum Plus
May Challenge 2018 Division 1
Dibs on Fibs, Fake Binary Search, Edges in Spanning Trees, S-T Mincut, Change the Signs
September Challenge 2018 Division 1
AND Square Subsegments, Sasha and Photos, Table Game, Bad Shuffle
November Challenge 2018 Division 1
Appy Loves One, Good Median, Magician versus Chef 2, Binary Strings
February Challenge 2019 Division 1
Chef and Secret Ingredients, Maximize the Tax, Art of Balance, Yet Another Tree Problem, Xor Decomposition, Guess It Right, Manhattan Rectangle
September Challenge 2019 Division 1
Biladerim Icin, Fuzzy Linear Combinations, Expected GCD, Doofish Set, Dodgers, Power Sum, Chef Designed a Network
Vietnam