Chess: What is the longest sequence of moves that force a checkmate? - Quora
Chess: What is the longest sequence of moves that force a checkmate? - Quora
Breakfast: My Mouseslip - Chess.com
8-piece endgame tablebases - first findings and interview! | ChessBase
theory - What is the longest possible forced checkmate sequence? - Chess Stack Exchange
Don't be afraid of stronger opponents! | ChessBase
Record-breaking Chess Puzzles - ChessPuzzle.net
White to mate in 549 (Prompt: there is a knight underpromotion on the 6th move). This is the longest possible forced mate in 7 or less pieces endgames. It was calculated by
The Longest Forced Checkmate I've Ever Seen! - YouTube
What is the earliest position where black has forced mate in under 10 moves on white to move (and vice versa)? - Quora