July Challenge 2015
Na2a and lucky stone, Chef and Cube, Bread
December Challenge 2015
Chef and the stones, Plane Division
April Challenge 2016
Chef and Ballons, Chef And Magical Path, Chef And Coloring
August Challenge 2016
Chef and Chocolate, Chef and Round Run
September Challenge 2016
Chef and calculation, Faded Palindromes, Chef and digits of a number
October Challenge 2016
Chef and Keyboard, Big Queries, Fenwick Iterations, Chef and Three Dogs, Chef and Two String
November Challenge 2016
Chef and squares, Task for Alexey
August Cook-Off 2016
Tweedle-Dee and Tweedle-Dum
September Challenge 2020 Division 2
A Problem on Sticks, Ada Matrix
August Lunchtime 2020 Division 2
Game on a Strip, Mode of Frequencies, Ratings and Rankings
India