Notes from building OnlyMove: chess improvement, product deep-dives, and technical write-ups.https://onlymove.ai/en-ushttps://onlymove.ai/blog/from-1950-to-2400-building-an-opening-trainer/https://onlymove.ai/blog/from-1950-to-2400-building-an-opening-trainer/Four years stuck at 1950, a notebook that grew faster than I could review it, and the trainer I built for one user – me – that became OnlyMove.Mon, 17 Aug 2026 00:00:00 GMTStoryimprovementopeningsspaced-repetitionfsrs