These are the training PGNs from storage.lczero.org/files/training_pgns filtered to include only “strong” games that end in checkmate, have a three-medal beauty score, an elegance score above 50, and are considered by the Interesting Wins Search Tool to be “very interesting”.
The training games are run at a low depth and a high speed, and add up to about half a million per day. That is just too many, so filtering works the best. All games have evaluations; beauty, elegance, and IWST scores; openings; plycount; and novelty annotations.