March Challenge 2017
Xenny and Alternating Tasks, Bear and Extra Number
August Long Challenge 2017
Chef and Rainbow Array, Greedy Candidates
September Challenge 2017
Little Chef and Sums, Minimum Good Permutation, Chef and Pick Digit
October Challenge 2017
Max Mex, Counter Test For CHEFSUM, A Balanced Contest
January Challenge 2018
Partition the numbers, String Merging, Maximum Score, K-Concatenation, Rectangle
March Challenge 2018 DIV 2
A Big Sale, Mix the Colors, Chef and Glove, Minion Chef and Bananas
April Challenge 2018 Division 2
Weight of Numbers, Count Good Prefixes, Workers
August Challenge 2018 Division 2
Modular GCD, Spell Bob, Sheokand and Number, Problem Sort
September Challenge 2018 Division 2
Magician versus Chef, War of XORs, Chef and Adventures, Bad Shuffle
ProCon Junior (Rated for Division 2)
Chef and Secret Ingredient, Chef and Bored Games, Chef and Polygon Cakes
India