February Challenge 2016
Chef-Detective, Chef and Strange Operations
September Challenge 2016
Chef and digits of a number, Faded Palindromes, Chef and calculation
October Challenge 2016
Chef and Keyboard, Chef and Three Dogs
November Challenge 2016
Count Permutations, Chef and squares, Task for Alexey
October Cook-Off 2016
Watson asks Does Permutation Exist, ChefWatson uses Social Network
April Challenge 2017
Similar Dishes, Dish Of Life
June Challenge 2017
A Good Set, Chef and the Feast, Xenny and Coin Rankings, Pairwise union of sets
June Lunchtime 2017
Two Numbers, Maximum Unique Segment
November Challenge 2019 Division 2
Physical Exercise, Hard Sequence, Weapon Value
December Challenge 2019 Division 2
Plus Multiply, That Is My Score!
April Challenge 2020 Division 2
Sell All the Cars, COVID Pandemic and Long Queue
