February Challenge 2020 Division 2
No Change Required, Chef and Railway Stations, Long Contest and Cook Off Overlaps, (Challenge) Raisins, Hard Cash, School of Geometry, The Theatre Problem
March Challenge 2020 Division 2
XOR Engine, Ada Bishop 2, Pintu and Fruits
April Challenge 2020 Division 1
Strange Number, Squared Subsequences, Ready Bitwise, Leaked Answers (Challenge)
March Cook-Off 2020 Division 2
Mysterious Sequence, Find Your Gift, Box of Chocolates, Escape the Tree
May Cook-Off 2020 Division 1
Roads in Chefland, Chef, Chefina and Their Friendship
August Challenge 2020 Division 1
Insanely Hard School Exams, Subsequence Frequency Counting, Smallest KMP, Chef and Wedding Arrangements
July Cook-Off 2020 Division 1
Even-tual Reduction, OR-thodox Distinction
August Lunchtime 2020 Division 1
Game on a Strip, Alien Invasion
RECode 12.0 (Rated for all)
Chef and String, Chef and Walk, Chef and Numbers
Coders' Legacy (Rated for all)
Chef vs Doof, Doof on Cartesian, Doof fires Brackets
India