October Mega Cook-Off 2018 Division 2
Ada and the Staircase, Binary Nim 2
September Challenge 2018 Division 2
War of XORs, Chef and Adventures, Table Game, Bad Shuffle, Magician versus Chef
November Challenge 2018 Division 2
Chef and Difficult Contests, Chef and Happiness, Magician versus Chef 2, Good Median, Appy Loves One, Chef and Ridges
October Challenge 2018 Division 2
Minimize Digitsum, Chef and Serves, Byte to Bit
January Challenge 2019 Division 2
Different Neighbours, Lucky Number Game, Distinct Pairs, Chef and Modulo Game, Fancy Quotes
February Challenge 2019 Division 1
Manhattan Rectangle, Chef and Secret Ingredients, Art of Balance
March Challenge 2019 Division 2
Chef got Recipes, Chef and Number Game, Chef and a Beautiful Digit
April Challenge 2019 Division 2
Friend or Girlfriend, Maximum Remaining, Subtree Removal, Fencing
May Challenge 2019 Division 2
Matches, Where to Build the Roads, Reduce to One
June Cook-Off 2019 Division 2
Multiple Choice Exam, Ants and Anteaters, Eat Twice, Drink Slush
April Cook-Off 2020 Division 2
Matrix Decomposition, Lift Requests, Simple Operations
January Challenge 2021 Division 2
Watching CPL, Fair Elections
South Africa