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docs(NIP-64): Portable Game Notation

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NIP-64
======
Portable Game Notation
-----
`draft` `optional`
This NIP defines `kind:30` notes representing Chess games in [PGN][pgn_specification] format, which can be read by humans and is also supported by most chess software.
## Note
### Content
The `.content` of these notes is a string representing a [PGN-database][pgn_formal_syntax].
### Tags
A note can contain `e` tags of each move or a subset of moves with the hashed piece placement data of a [FEN][fen_wikipedia] string, e.g.
```shell
sha256('rnbqkbnr/pppppppp/8/8/8/8/PPPPPPPP/RNBQKBNR') := '63e2bcdcf5b275cd48b535ed210fb321197c4296b08d04329ca2d8f4391342a4'
sha256('8/8/4R1p1/2k3p1/1p4P1/1P1b1P2/3K1n2/8') := 'e8f876dfe8adac7ee02413f2160bae5808b7ea27a190cc7d4896d5e64f600c3d'
```
```json
[ "e", "63e2bcdcf5b275cd48b535ed210fb321197c4296b08d04329ca2d8f4391342a4"]
[ "e", "e8f876dfe8adac7ee02413f2160bae5808b7ea27a190cc7d4896d5e64f600c3d"]
```
## Example
### Content
```pgn
// A game where nothing is known. Game still in progress, game abandoned, or result otherwise unknown.
// Maybe players died before a move has been made.
*
```
```pgn
1. e4 *
```
```pgn
[White "Fischer, Robert J."]
[Black "Spassky, Boris V."]
1. e4 e5 2. Nf3 Nc6 3. Bb5 {This opening is called the Ruy Lopez.} *
```
```pgn
[Event "F/S Return Match"]
[Site "Belgrade, Serbia JUG"]
[Date "1992.11.04"]
[Round "29"]
[White "Fischer, Robert J."]
[Black "Spassky, Boris V."]
[Result "1/2-1/2"]
1. e4 e5 2. Nf3 Nc6 3. Bb5 {This opening is called the Ruy Lopez.} 3... a6
4. Ba4 Nf6 5. O-O Be7 6. Re1 b5 7. Bb3 d6 8. c3 O-O 9. h3 Nb8 10. d4 Nbd7
11. c4 c6 12. cxb5 axb5 13. Nc3 Bb7 14. Bg5 b4 15. Nb1 h6 16. Bh4 c5 17. dxe5
Nxe4 18. Bxe7 Qxe7 19. exd6 Qf6 20. Nbd2 Nxd6 21. Nc4 Nxc4 22. Bxc4 Nb6
23. Ne5 Rae8 24. Bxf7+ Rxf7 25. Nxf7 Rxe1+ 26. Qxe1 Kxf7 27. Qe3 Qg5 28. Qxg5
hxg5 29. b3 Ke6 30. a3 Kd6 31. axb4 cxb4 32. Ra5 Nd5 33. f3 Bc8 34. Kf2 Bf5
35. Ra7 g6 36. Ra6+ Kc5 37. Ke1 Nf4 38. g3 Nxh3 39. Kd2 Kb5 40. Rd6 Kc5 41. Ra6
Nf2 42. g4 Bd3 43. Re6 1/2-1/2
```
### Notes
```json
{
"kind": 30,
"content": "1. e4 *",
...
}
```
```json
{
"kind": 30,
"tags": [
["alt", "Fischer vs. Spassky in Belgrade on 1992-11-04 (F/S Return Match, Round 29)"],
[ "e", "63e2bcdcf5b275cd48b535ed210fb321197c4296b08d04329ca2d8f4391342a4"],
...
[ "e", "e8f876dfe8adac7ee02413f2160bae5808b7ea27a190cc7d4896d5e64f600c3d"]
],
"content": "[Event \"F/S Return Match\"]\n[Site \"Belgrade, Serbia JUG\"]\n[Date \"1992.11.04\"]\n[Round \"29\"]\n[White \"Fischer, Robert J.\"]\n[Black \"Spassky, Boris V.\"]\n[Result \"1/2-1/2\"]\n\n1. e4 e5 2. Nf3 Nc6 3. Bb5 {This opening is called the Ruy Lopez.} 3... a6\n4. Ba4 Nf6 5. O-O Be7 6. Re1 b5 7. Bb3 d6 8. c3 O-O 9. h3 Nb8 10. d4 Nbd7\n11. c4 c6 12. cxb5 axb5 13. Nc3 Bb7 14. Bg5 b4 15. Nb1 h6 16. Bh4 c5 17. dxe5\nNxe4 18. Bxe7 Qxe7 19. exd6 Qf6 20. Nbd2 Nxd6 21. Nc4 Nxc4 22. Bxc4 Nb6\n23. Ne5 Rae8 24. Bxf7+ Rxf7 25. Nxf7 Rxe1+ 26. Qxe1 Kxf7 27. Qe3 Qg5 28. Qxg5\nhxg5 29. b3 Ke6 30. a3 Kd6 31. axb4 cxb4 32. Ra5 Nd5 33. f3 Bc8 34. Kf2 Bf5\n35. Ra7 g6 36. Ra6+ Kc5 37. Ke1 Nf4 38. g3 Nxh3 39. Kd2 Kb5 40. Rd6 Kc5 41. Ra6\nNf2 42. g4 Bd3 43. Re6 1/2-1/2"
...
}
```
## Client Behavior
Clients SHOULD check whether the formatting is valid and all moves comply with chess rules.
Clients SHOULD display the content represented as chessboard.
Clients SHOULD publish PGN notes in ["export format"][pgn_export_format] ("strict mode", i.e. created by machines) but expect incoming notes to be in ["import format"][pgn_import_format] ("lax mode", i.e. created by humans).
Clients SHOULD add `e` tags of each move or a subset of moves (hashed piece placement data of a [FEN][fen_wikipedia] string) in order to improve discoverability of certain board positions.
Clients MAY include additional tags (e.g. like [`"alt"`](https://github.com/nostr-protocol/nips/blob/master/31.md)) in order to represent the note to users of non-supporting clients.
## Relay Behavior
Relays MAY validate PGN contents and reject invalid notes.
## Resources
- [PGN Specification][pgn_specification]: PGN (Portable Game Notation) specification
- [PGN Specification Supplement](https://github.com/mliebelt/pgn-spec-commented/blob/main/pgn-spec-supplement.md): Addition for adding graphical elements, clock values, eval, ...
- [PGN Formal Syntax][pgn_formal_syntax]
- [PGN Seven Tag Roster][pgn_seven_tag_roster]
- [PGN Import Format][pgn_import_format]
- [PGN Export Format][pgn_export_format]
- [Forsyth–Edwards Notation (FEN)][fen_wikipedia]
- [lichess / pgn-viewer (GitHub)](https://github.com/lichess-org/pgn-viewer): PGN viewer widget, designed to be embedded in content pages
[pgn_specification]: https://github.com/mliebelt/pgn-spec-commented/blob/main/pgn-specification.md
[pgn_formal_syntax]: https://github.com/mliebelt/pgn-spec-commented/blob/main/pgn-specification.md#18-formal-syntax
[pgn_seven_tag_roster]: https://github.com/mliebelt/pgn-spec-commented/blob/main/pgn-specification.md#811-seven-tag-roster
[pgn_import_format]: https://github.com/mliebelt/pgn-spec-commented/blob/main/pgn-specification.md#31-import-format-allows-for-manually-prepared-data
[pgn_export_format]: https://github.com/mliebelt/pgn-spec-commented/blob/main/pgn-specification.md#32-export-format-used-for-program-generated-output
[fen_wikipedia]: https://en.wikipedia.org/wiki/Forsyth%E2%80%93Edwards_Notation