October Challenge 2014
Magical Girl and Colored Liquid Potions, Chef and Ground
September Challenge 2016
Chef and Friends, Chef and digits of a number, Faded Palindromes, Chef and calculation
February Cook-Off 2016
Puppy and Board, Puppy and Sum
February Challenge 2017
Chef and Triangles, Chef and His Apartment Dues, Gerrymander
January Lunchtime 2017
Sealing up, Nothing in Common
September Challenge 2017
Sereja and Commands, Chef and Pick Digit, Minimum Good Permutation, Fill The Matrix, Little Chef and Sums
November Challenge 2017
Chef goes Left Right Left, Villages and Tribes
February Cook-Off 2018
Chef and Cook-Off, Chef and Tuples
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
April Cook-off 2018 Division 2
Run Direction, Cut the Board, Binary Nim
July Challenge 2018 Division 2
Magic Set, Strike or Spare
September Challenge 2018 Division 2
War of XORs, Chef and Adventures, Magician versus Chef
October Challenge 2018 Division 2
Chef and Serves, Byte to Bit
February Challenge 2019 Division 1
Manhattan Rectangle, Chef and Secret Ingredients, Art of Balance
February Cook-Off 2019 Division 1
Max Range Queries, Chef and Secret Password, Chef and Party
October Lunchtime 2019 Division 1 (Unrated)
Counting Inversions Again!, Box Game
Hungary