April Challenge 2016
Help Watson Escape, Chef and Ballons, Chef And Magical Path, Chef And Coloring
September Challenge 2016
Chef and digits of a number, Faded Palindromes, Chef and calculation
October Challenge 2016
Chef and Keyboard, Chef and Three Dogs
October Cook-Off 2016
Watson asks Does Permutation Exist
March Challenge 2017
Xenny and Alternating Tasks, Bear and Extra Number
April Challenge 2017
Bear and Row 01, Similar Dishes
June Challenge 2017
A Good Set, Chef and the Feast, Xenny and Coin Rankings
November Challenge 2018 Division 2
Chef and Difficult Contests
India