How Many Chess Openings Are There? The Complete Count by ECO Code

What Is a Good Accuracy Score in Chess? Benchmarks for Every Rating Level

Chess engines score every move from 0-100, but what counts as "good"? Here are the real benchmarks for 800, 1000, 1200, 1500, 1800, and 2000+ rated players — and why a single accuracy number never tells the whole story.