August Challenge 2016
Chef and Circle Run, Chef and Chocolate, Chef and Round Run, Funny gnomes, Maximum Grid, Chef and Tree, A Good Problem, Chef and His Garden
September Challenge 2016
Dividing Machine, Chef and calculation, JosephLand, The New Restaurant, Faded Palindromes, Chef and digits of a number, Chef and Matrix Division, Chef and Friends
October Challenge 2016
Big Queries, Chef and Two String, Chef and Three Dogs, Fenwick Iterations, Chef and Keyboard
November Challenge 2016
Count Permutations, Friends Meeting, Urban Development, Gift and Chef, Kirito in Memeland, Chef and squares, Sereja and Permutations 3, Sereja and Ways in the Cube, Task for Alexey
July Challenge 2019 Division 1
Hit the Coconuts, Snake and Apple Tree, Guess the Prime!, Codechef War, Circular Merging
Belarus