July Challenge 2017
Pishty and tree, Whats in the Name, Calculator , IPC Trainers, Two Coins, Chef and Sign Sequences
February Challenge 2019 Division 2
(Challenge) Chef with Orchestra in the Kitchen, Deputy Chef, Art of Balance, Appy and Contest, Chef and Secret Ingredients, Chef and Magical Jars, Guess It Right, Manhattan Rectangle
April Challenge 2019 Division 1
Offer for Chef, Kira Loves Palindromes, Mininum XOR over Tree, Playing with Numbers, Subtree Removal, Edgy, Moving Rectangles (Challenge), Sonya and Queries
China