September Challenge 2019 Division 2
Chef Designed a Network, Easy Fibonacci, Chef and Interesting Subsequences
January Challenge 2020 Division 2
Chef and Dynamo, Doraemon, Equality, Breaking Bricks
February Challenge 2020 Division 1
No Change Required, The Theatre Problem, School of Geometry, Hard Cash, Long Contest and Cook Off Overlaps
March Challenge 2020 Division 2
Ada Bishop 2, Pintu and Fruits, Lasers Everywhere, XOR Engine
January Lunchtime 2020 Division 2
Bob and His Friends, Chef and Street Food, Under the Tunnels
August Challenge 2020 Division 2
Chef and Wedding Arrangements, Smallest KMP, Another Card Game Problem, Chef Wars - Return of the Jedi, Subsequence Frequency Counting, Chef and Linear Chess
September Challenge 2020 Division 1
Chefina and Swap, Find XOR, Ada Matrix
October Challenge 2020 Division 2
Positive AND, Replace for X, D-Dimensional MST, Covid Run, Chef and Easy Queries
November Challenge 2020 Division 1
Restore Sequence, Scalar Product Tree
December Challenge 2020 Division 1
Hail XOR, Positive Prefixes, Even Pair Sum
December Cook-Off 2020 Division 1
Self-Destructing Strings, Circle of Chaos, Carry All Fruits
December Lunchtime 2020 Division 1 (Unrated)
Three Letters, One Zero Swaps
June Cook-Off 2021 Division 1
Binary String on Steroids
United States