February Challenge 2017
Eugene and big number, Chef and His Apartment Dues
March Challenge 2017
Xenny and Alternating Tasks, Bear and Extra Number, (CH) Bear and Sorted Rows, Bandwidth of a matrix
April Challenge 2017
Dish Of Life, Bear and Row 01, Similar Dishes
May Challenge 2017
Chef and his daily routine, Courses in an university
July Challenge 2017
Chef and Sign Sequences, Whats in the Name
August Long Challenge 2017
Chef and Rainbow Array, Chef and Mover, Palindromic Game, Greedy Candidates
October Challenge 2017
Chef and a great voluntary Program, Max Mex, A Balanced Contest
November Challenge 2017
Villages and Tribes, Chef goes Left Right Left, Chef Hates Palindromes, Periodic Palindrome Construction
January Challenge 2018
Maximum Score, Rectangle, Partition the numbers
March Challenge 2018 DIV 2
Chef and Easy Problem, A Big Sale, Mix the Colors, Chef and Glove, Minion Chef and Bananas
March Cook-off 2018 Division 2
Chef Restores a Matrix, Chef Judges a Competition, Chef Goes to the Cinema
March Lunchtime 2018 Division 2 (Unrated)
Chef and Friends, Magic Elements
April Challenge 2018 Division 2
Count Good Prefixes, Average of Pairs, Workers
May Challenge 2018 Division 2
Mighty Friend, Minimum Deletions, Xor Again, Dibs on Fibs
India