September Challenge 2018 Division 2
Sasha and Photos, Magician versus Chef, War of XORs, Chef and Condition Zero (Challenge), Chef and Adventures, Table Game, Bad Shuffle, AND Square Subsegments
December Challenge 2018 Division 1
Max and Electrical Panel, Chef and Interactive XOR, Directing Edges, (Challenge) Delete DAG
November Challenge 2018 Division 1
Appy Loves One, Good Median, Chef, Primes and Trees (Challenge), Magician versus Chef 2
October Challenge 2018 Division 2
Byte to Bit, Chef and Circles, Chef and Serves, Minimize Digitsum, Beautiful Bricks, Appy and Balloons , Chef and Surprise Chessboard
January Challenge 2019 Division 1
Yet Another Problem About Sequences, Different Neighbours, Distinct Pairs, A Pizza Slice
February Challenge 2019 Division 1
(Challenge) Chef with Orchestra in the Kitchen, Maximize the Tax, Art of Balance, Xor Decomposition, Chef and Secret Ingredients, Guess It Right, Manhattan Rectangle
March Challenge 2019 Division 1
Cheating on Queue, Yet Again a Subarray Problem, (Challenge) Interleaving Strings
April Challenge 2019 Division 1
Offer for Chef, Kira Loves Palindromes, Mininum XOR over Tree, Playing with Numbers, Subtree Removal, Moving Rectangles (Challenge)
Hong Kong (SAR)