May Challenge 2019 Division 2
Reduce to One, Where to Build the Roads, Matches
June Challenge 2019 Division 2
Road Signs, Chef and Proxy, Lent Money, Guddu on a Date, Chef and Ingredients, Sum and GCD
August Challenge 2019 Division 2
Chef and Gordon Ramsay, Zombie and the Caves, Distribute Apples, Football, Maximize an Expression, Dilemma, Encoding, Guddu and his Mother
September Challenge 2019 Division 1
Chef and Good Subsequences, Biladerim Icin, Fuzzy Linear Combinations, Chef Designed a Network
October Challenge 2019 Division 1
Even Edges, Chef and Maximum Star Value, Array Modification
January Challenge 2020 Division 1
Chef and Dynamo, Doraemon, Chefina and Prefix Suffix Sums
China