September Challenge 2018 Division 2
War of XORs, Chef and Condition Zero (Challenge), Chef and Adventures, Table Game, Bad Shuffle, Magician versus Chef
October Challenge 2018 Division 2
Chef and Surprise Chessboard, Chef and Circles, Byte to Bit, Chef and Serves, Minimize Digitsum, Beautiful Bricks, Appy and Balloons
April Challenge 2020 Division 1
Strange Number, Squared Subsequences, Perfect Power Divisors, Ready Bitwise, Leaked Answers (Challenge)
Russia