November Challenge 2017
Chef goes Left Right Left, Periodic Palindrome Construction, Villages and Tribes, Chef Hates Palindromes
January Challenge 2018
K-Concatenation, Maximum Score, Rectangle, Partition the numbers
March Challenge 2018 DIV 2
Mix the Colors, Minion Chef and Bananas, Minions and Voting, Chef and Glove, A Big Sale, Chef and Easy Problem
June Challenge 2018 Division 2
Vision, Binary Shuffle, Naive Chef
July Challenge 2018 Division 2
Reach Equilibrium, No Minimum No Maximum, Magic Set, Strike or Spare, No Strings Attached
