October Mega Cook-Off 2018 Division 2
Ada and the Staircase, Pumping Water, Binary Nim 2
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
February Challenge 2019 Division 1
Chef and Secret Ingredients
April Challenge 2019 Division 2
Playing with Numbers, Friend or Girlfriend, Maximum Remaining, Subtree Removal, Fencing
January Cook-Off 2022 Division 2
Palindromes Not Allowed, Mean Maximization, Subsegment Divisibility
Germany