DeepMind building an effective StarCraft AI, and why it's a hard game for a computer to play: https://deepmind.com/blog/alphastar-mastering-real-time-strategy-game-starcraft-ii/
(When you build an AI using a ton of self-play, it's pretty likely that you end up finding some novel strategies too!)
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Exploring design ideas using AI as a learning assistant, for creative exploration: https://andymatuschak.org/hmwl/
I'm pretty impressed with Cursor: I've successfully asked it to perform codebase transforms in English, and it's worked!
E.g. "Replace all calls foo(..., true) with foo_immediate(...) define a foo_immediate function".
I'm still reading the diff and checking tests -- it's still AI after all.
... and my third refactoring with Cursor changed some function calls that I didn't want it to modify. Subtle.
I've had the most success with AI coding tools when I know exactly what I want the output to look like.