September Challenge 2018 Division 2
Magician versus Chef, War of XORs, Chef and Adventures, Table Game, Bad Shuffle, AND Square Subsegments
October Challenge 2018 Division 2
Chef and Circles, Byte to Bit, Chef and Serves, Chef and Surprise Chessboard, Minimize Digitsum, Beautiful Bricks, Appy and Balloons
June Challenge 2019 Division 1
Lent Money, Chef and Ingredients, Chef and His Dish, Intersecting Paths, Sum and GCD
July Cook-Off 2019 Division 1
Birthday Gift Again, War in Treeland Again, Expected Product
September Challenge 2019 Division 1
Biladerim Icin, Fuzzy Linear Combinations, Expected GCD, Chef Designed a Network
Vietnam