https://www.pyrra.net/blog.html Writing on security, engineering, and shipping too many side projects — by Felix Hans. en Mon, 22 Jun 2026 00:00:00 GMT https://www.pyrra.net/blog/every-chess-engine-makes-the-same-wrong-assumption.html https://www.pyrra.net/blog/every-chess-engine-makes-the-same-wrong-assumption.html Mon, 22 Jun 2026 00:00:00 GMT Engineering Every major chess engine—from Stockfish to Leela—assumes your opponent plays perfectly. Maxwell doesn't. Here's the research behind building an engine that adapts to how you actually play. https://www.pyrra.net/blog/how-i-found-21000-patient-photos-online.html https://www.pyrra.net/blog/how-i-found-21000-patient-photos-online.html Mon, 22 Jun 2026 00:00:00 GMT Security How a routine scan uncovered 21,000 exposed patient images — and what responsible disclosure looks like in practice. https://www.pyrra.net/blog/building-your-own-drm.html https://www.pyrra.net/blog/building-your-own-drm.html Fri, 20 Mar 2026 00:00:00 GMT Security I recently looked at the content protection of a European audiobook streaming platform. They decided to build their own DRM instead of using Widevine or FairPlay. It went about as well as you'd expect.