August Challenge 2018 Division 2
Modular GCD, Problem Sort, Lonely Cycles, Sheokand and Number, Spell Bob
September Challenge 2018 Division 2
Sasha and Photos, Magician versus Chef, War of XORs, Chef and Adventures, Bad Shuffle
August Lunchtime 2018 Division 2
Chef and Problem Setting, Chef and Eid
December Challenge 2019 Division 2
Chefina and Ranges, Plus Multiply, Easy Subsequence Selection, That Is My Score!, Addition
August Challenge 2020 Division 2
Chef Wars - Return of the Jedi, Another Card Game Problem, Chef and Linear Chess, Chef and Wedding Arrangements
Vietnam