What separates a 70% test from an 80% test in dressage?

The difference between a seventy percent and an eighty percent test represents the difference between correct, consistent execution at the required level and exceptional performance that demonstrates the horse's natural quality, the depth of training development, and the harmony between horse and rider at a level that distinguishes it from merely competent work. A seventy percent test shows consistent correctness — the movements are performed at the right letters with appropriate accuracy, the gaits show required rhythm and contact, and the overall performance is technically solid — but lacks the qualities that produce scores of eight, nine, and ten on individual movements: exceptional gaits with extraordinary elasticity and expression, movements performed with genuine power and lightness, transitions that are absolutely seamless, and a quality of partnership between horse and rider that makes the aids invisible. In a seventy percent test, sixes and sevens predominate with few scores above seven; in an eighty percent test, sevens, eights, and nines predominate with rare sixes. The horse's natural quality is a significant factor in this range: a horse with extraordinary natural gaits — exceptional elasticity, great suspension, a naturally uphill balance — has a structural advantage in this range that a horse with more ordinary gaits cannot easily overcome through training quality alone, because the exceptional gaits produce high scores on gait-dependent movements that the more ordinary horse simply cannot match regardless of training correctness. Rider harmony — the degree to which the aids are invisible and the horse appears to perform of its own volition — also distinguishes this range, because at eighty percent the horse and rider should appear to move as one rather than as a rider giving visible instructions to a horse executing them.