chess VS chesslib

If you're interested, here's my chess implementation including an engine (sans UI): https://github.com/marvk/chess

You posted this yesterday asking for feedback. Your project is five tiny classes that build on to of the library at https://github.com/bhlangonijr/chesslib , and they are objectively bad.

Thanks! Do you mean chesslib? That's someone else's library that handles the chess logic, and I didn't feel like reinventing the wheel, so :p

If you are talking about algebraic notation. Getting the piece and the destination square is trivial. The origin is more interesting to produce: have a list of pieces (and their position) currently on the board; if there is no disambiguation#Disambiguating_moves), check which of the two can legally move to the target square. How you implement the piece list is also interesting: you can start in a naive manner, but also use a bitboard, like in the decodeSan function in chesslib.

My guess: you are hitting OOM because PGN files are huge? On https://github.com/bhlangonijr/chesslib there is small usage tutorial and they mention this: