checkmate - Could you show me some very easy mate in 20? - Chess Stack Exchange
Champions Chess Tour on Twitter: ".@DavidHowellGM said this is the most difficult mate in two he had ever seen... then he solved it in like 20 seconds. Can you solve the checkmate
8-piece endgame tablebases - first findings and interview! | ChessBase
Longest dual-free direct mate problem | ChessBase
forced checkmate – Daily Chess Musings
What is the earliest position where black has forced mate in under 10 moves on white to move (and vice versa)? - Quora
The Longest Forced Checkmate I've Ever Seen! - YouTube
Record-breaking Chess Puzzles - ChessPuzzle.net
Checkmate - Wikipedia
Black has a forced mate in three moves | Chess Puzzle #312
White to play and force mate in two : r/chess
Forced Mate in 130 Moves - White to Play - 1955, J. Halumbirek : r/chess
Grotesque Chess! Forced Mate In 86 Moves - YouTube