Chess analysis that actually talks back
What surprised me here is not that Claude can annotate a PGN. Plenty of tools can dress up an engine line with prose. The interesting part is the attempt to turn a post-mortem into an argument: the model is supposed to interrogate Stockfish the way a human teammate would, then push back on the player’s own recorded thoughts. That’s a much better target than “explain this move,” which usually devolves into generic engine theater. I’d actually try this on a serious rapid game, but probably not on
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