March Challenge 2017
Bear and Extra Number, Bandwidth of a matrix, Xenny and Alternating Tasks
April Challenge 2017
Dish Of Life, Similar Dishes
May Challenge 2017
Chef and his daily routine, Courses in an university
August Long Challenge 2017
Chef and Rainbow Array, Chef and Mover, Greedy Candidates
November Challenge 2017
Chef goes Left Right Left, Villages and Tribes, Periodic Palindrome Construction, Chef Hates Palindromes
December Challenge 2017
Total Diamonds, Chef And his Cake, Penalty Shoot-out
March Challenge 2019 Division 2
Chef got Recipes, Chef and Number Game
Mexico