PGN Parser Edge Cases

[nloding]

Problem

Several PGN parser edge cases are not handled:

1. Date formats: Only YYYY.MM.DD supported, not YYYY/MM/DD or DD.MM.YYYY
2. Round formats: Complex formats like 1.2.3 may not roundtrip correctly
3. Unicode: Some characters in comments/names may not survive roundtrip
4. Additional tags: Not handled specially:
   • [Annotator]
   • [Termination]
   • [Mode]
   • [WhiteTeam], [BlackTeam]
5. Rating types: Only standard Elo; no Rapid/Blitz distinction

Solution

1. Add date format flexibility
2. Preserve unknown tags during import
3. Add Unicode roundtrip tests
4. Consider rating type field

File

src/pgn.rs

Priority

Low - edge cases