February Challenge 2020 Division 2
Expected Change, No Change Required, The Theatre Problem, School of Geometry, Hard Cash, (Challenge) Raisins, Long Contest and Cook Off Overlaps, Chef and Railway Stations
March Challenge 2020 Division 2
Chef and DAG, Pintu and Fruits, Lasers Everywhere Alternative, Lasers Everywhere, Ada Bishop 2, XOR Engine
April Challenge 2020 Division 1
Leaked Answers (Challenge), Squared Subsequences, Factor Tree, Ready Bitwise, Perfect Power Divisors, Strange Number
July Challenge 2020 Division 1
LCM Constraints, Chefina and Swaps, Chef and Dragon Dens, Missing a Point, Doctor Chef
August Challenge 2020 Division 1
Insanely Hard School Exams, Subsequence Frequency Counting, Chefina and Strange Tree, Smallest KMP, Chef Thanos Wants Perfect Balance, Chef and Wedding Arrangements
Turkey