November Challenge 2018 Division 2
Appy Loves One, Good Median, Magician versus Chef 2, Chef and Difficult Contests, Chef and Happiness, Chef and Ridges
October Challenge 2018 Division 2
Chef and Serves, Chef and Circles, Byte to Bit, Chef and Surprise Chessboard, Minimize Digitsum, Beautiful Bricks, Appy and Balloons
January Challenge 2019 Division 1
Different Neighbours, Distinct Pairs
March Challenge 2019 Division 2
Chef got Recipes, Cheating on Queue, Chef and Number Game, Yet Again a Subarray Problem, Chef and a Beautiful Digit
China