July Challenge 2020 Division 2
Chefina and Swaps, Ada King, Chef and Strings, Chef and Card Game, Missing a Point, Doctor Chef
August Challenge 2020 Division 2
Insanely Hard School Exams, Chef Wars - Return of the Jedi, Another Card Game Problem, Chef and Linear Chess, Smallest KMP, Chef and Wedding Arrangements
September Challenge 2020 Division 2
A Problem on Sticks, Coronavirus Spread 2, Ada Matrix, Find XOR, Chef and Trump Cards, Chefina and Swap
January Challenge 2021 Division 2
Chef and Ants, Watching CPL, Fair Elections
December Challenge 2020 Division 1
Even Pair Sum, Positive Prefixes, Hail XOR
February Challenge 2021 Division 2
Frog Sort, Team Name, Another Tree with Number Theory, Prime Game, Multiple Games, Maximise Function
March Challenge 2021 Division 2
Interesting XOR!, College Life 4, Space Arrays
May Challenge 2021 Division 2 (Rated)
Tree House, Modular Equation, Tic Tac Toe, Xor Equality, An Interesting Sequence, Valid Paths
June Lunchtime 2021 Division 2
From Rational to Binary, False Number, Unpleasant Ones, Tic Tac Toe
India