How many chess positions are there?

00:00 Introduction
02:03 Level 0: Definitions
04:07 Level 1: The basics
05:10 Level 2: Number of pieces
07:29 Level 3: Types of pieces
09:18 Level 4: Castling rights
12:07 Level 5: Pawn structure
17:06 Level 6: En Passant
19:13 Level 7: Recommended reading

This video is licensed under a Creative Commons BY-SA 4.0 License. The following works used are also under a Creative Commons BY-SA License (https://creativecommons.org/licenses/...
https://en.wikipedia.org/wiki/Chess#/...
https://en.wikipedia.org/wiki/Chess#/...
https://en.wikipedia.org/wiki/Garry_K...
https://en.wikipedia.org/wiki/Infant#...
https://commons.wikimedia.org/wiki/Ch...
https://en.wikipedia.org/wiki/Peter_T...
https://en.wikipedia.org/wiki/Magnus_...
https://en.wikipedia.org/wiki/Observa...
https://en.wikipedia.org/wiki/Galaxy_...
https://en.wikipedia.org/wiki/Moon#/m...
https://en.wikipedia.org/wiki/Claude_...

The following works used are under a Creative Commons BY License (https://creativecommons.org/licenses/...
https://en.wikipedia.org/wiki/Texas_h...
https://en.wikipedia.org/wiki/George_...
https://en.wikipedia.org/wiki/Deep_Bl...

Also screenshots taken from:
https://lichess.org
https://en.wikipedia.org/wiki/Chess
https://www.chess.com/
https://stockfishchess.org/
https://ccrl.chessdom.com/ccrl/4040/i...
https://www.fide.com/FIDE/handbook/La...
https://en.wikipedia.org/wiki/Forsyth...
https://en.wikipedia.org/wiki/Names_o...
https://xkcd.com/2501/
   • How many chess games are possible? - Numbe...  
https://en.wikipedia.org/wiki/Shannon...
https://en.wikipedia.org/wiki/Multino...
https://www.wolframalpha.com/
https://en.wikipedia.org/wiki/Stars_a...)
https://vision.unipv.it/IA1/Programmi...
https://en.wikipedia.org/wiki/Claude_...
https://github.com/tromp/ChessPositio...
https://www.statista.com/topics/1464/...
https://en.wikipedia.org/wiki/Metric_...