" by Leon and Olga Conus (newly revised by James and Susan McKeever) is the definitive resource.
The Russian student learns to play through the key, not down onto it. By using arm weight, the key is depressed with a gradual, controlled acceleration. This produces the legendary "Russian tone" — a round, golden, singing sound, even at triple forte. Fundamentals Of Piano Technique - The Russian Method Pdf
: Specialized training for the thumb to ensure smooth position changes and legato playing. " by Leon and Olga Conus (newly revised
A "relaxed" arm doesn't mean a limp one. It means avoiding unnecessary tension (the enemy of speed and tone) while keeping the fingertips "alert" and strong. Fundamentals Of Piano Technique - The Russian Method Pdf
Play all exercises in different keys and at different tempos.