Blog
2026-08-21
Time Control and Playing Strength in St. Louis
What's the difference between classical and blitz for top players, in classical Elo? Seeking an answer in St. Louis.
2026-08-12
Testing XPA: Elo ratings, accuracy, and a hint of deflation
Comparing XPA data with Elo ratings and accuracy %. XPA tracks Elo better than existing measures, and it seems to show evidence of rating deflation since 2005.
2026-08-01
Measuring chess performance with ChessDS XPA
A new metric for player performance, built on result and move predictions instead of raw engine evals.
2026-07-31
Predicting chess with machine learning
A blog post describing the two production models: a calibrated win/draw/loss predictor and a human-move ranker for 2400+ classical chess.
