July Challenge 2013
Chef and Walking on the rectangle
August Challenge 2013
Little Elephant and Lemonade, Hello Hello, Deleting numbers, Splitting Candies
February Challenge 2015
Chef and Chain, Chef and Equality
April Challenge 2016
Chef and Ballons, Chef And Magical Path, Chef And Coloring
June Challenge 2016
Chef And Binary Operation, Devu and an Array, Chef and Coins Game
November Challenge 2016
Count Permutations, Chef and squares, Task for Alexey
February Challenge 2017
Chef and His Apartment Dues
September Challenge 2018 Division 2
Magician versus Chef, War of XORs, Chef and Adventures
December Challenge 2018 Division 2
Chef and Interactive Contests
October Challenge 2018 Division 2
Chef and Serves, Byte to Bit
United States