November Challenge 2018 Division 2
Chef and Ridges, Chef and Difficult Contests, Chef and Happiness
September Challenge 2019 Division 2
Chef and Good Subsequences, Easy Fibonacci, Biladerim Icin, Chef Designed a Network, Chef and Interesting Subsequences
September Mega Cook-Off 2019 Division 2
Two Groups, Playing with Matches
September Lunchtime 2019 Division 2
Chef Feeds Cats, Chef and Football Match, Find the Sum
October Challenge 2019 Division 1
Chef and Maximum Star Value, Array Modification, Even Edges
February Challenge 2020 Division 1
Chef and Railway Stations, Expected Change, No Change Required, The Theatre Problem, School of Geometry, Hard Cash, (Challenge) Raisins, Long Contest and Cook Off Overlaps
July Challenge 2020 Division 1
Ada King, Chefina and Swaps, Chef and Dragon Dens, Missing a Point, Doctor Chef
India