December Lunchtime 2017
Strange Function, Days in Month
January Cook-Off 2018
Multiple of 3, Survive in ChocoLand
March Challenge 2018 DIV 2
Chef and Easy Problem, Mix the Colors
April Challenge 2018 Division 2
Highway Crossing, Count Good Prefixes, Average of Pairs
September Challenge 2018 Division 2
Bad Shuffle, Table Game, Chef and Adventures, War of XORs, Magician versus Chef, Chef and Condition Zero (Challenge)
October Challenge 2018 Division 1
Appy and Balloons , Minimize Digitsum, Chef and Surprise Chessboard
January Challenge 2019 Division 1
Distinct Pairs, A Pizza Slice, Different Neighbours, Yet Another Problem About Sequences
March Challenge 2019 Division 1
Chef got Recipes, Chef and a Beautiful Digit
April Challenge 2020 Division 1
Strange Number, Squared Subsequences
Ireland