February Challenge 2017
Chef and His Apartment Dues
April Challenge 2017
Dish Of Life, Bear and Row 01, Similar Dishes
May Challenge 2017
Chef and his daily routine, Courses in an university, Median of adjacent maximum numbers
June Challenge 2017
A Good Set, Xenny and Coin Rankings
September Challenge 2017
Minimum Good Permutation, Little Chef and Sums, Chef and Pick Digit
November Challenge 2017
Chef goes Left Right Left, Periodic Palindrome Construction, Villages and Tribes
December Challenge 2017
Chef And his Cake, Penalty Shoot-out
April Cook-Off 2017
Bear and Candies 123, Bear and AB
October Cook-Off 2017
Chef and Weird Queries, Chef and Employment Test
January Challenge 2018
K-Concatenation, Maximum Score, Rectangle, Partition the numbers
February Challenge 2018
Chef And His Characters, Chef And The Patents, Car-pal Tunnel
March Challenge 2018 DIV 2
Chef and Easy Problem, A Big Sale, Mix the Colors, Chef and Glove, Minion Chef and Bananas
September Challenge 2018 Division 2
Magician versus Chef, Chef and Adventures
December Challenge 2018 Division 2
Chef and Interactive XOR, Chef and Interactive Contests, Chef and An Ideal Problem
