Two other theories that could explain why OpenAI's models do so well: 1. They generate chess games from chess engine self play and add that to the training dat

Two other theories that could explain why OpenAI's models do so well: 1. They generate chess games from chess engine self play and add that to the training data (similar to the already-stated theory about their training data). 2. They have added chess reinforcement learning to the training at some stage, and actually got it to work (but not very well).