The Longest ever chess game!!

This is the longest recorded and rated chess game in history. This single game took over 20 hours to end in a draw! The FIDE rule at that time allowed playing to win for up to 100 moves without a piece being captured or a pawn move being made in some endings including rook and bishop vs rook. Today no exceptions are allowed in the general 50-move rule.

The endgame of this game is the famous rook and bishop vs. rook, which is known to be extremely difficult.