Not All Practice Is Created Equal: Longitudinal Evidence From Over 40,000 Chess Players

Area of Science:

• Cognitive Psychology
• Skill Acquisition
• Expert Performance

Background:

• Debate exists on the efficacy of deliberate practice versus other training methods.
• Previous research often lacked objective, longitudinal data on practice and performance.
• Critiques sometimes conflate deliberate practice with less effective training forms.

Purpose of the Study:

• To investigate the learning efficiency of deliberate practice compared to gameplay.
• To analyze objective, time-stamped data from a large cohort of chess players.
• To provide empirical evidence for the long-standing theoretical debate on expertise development.

Main Methods:

• Longitudinal analysis of 44,213 Chess.com players.
• Objective, time-stamped measures of practice activities and performance (rating improvement).
• Multilevel modeling to compare learning efficiency of deliberate practice vs. gameplay.

Main Results:

• Deliberate practice was substantially more efficient for learning than gameplay.
• The category of deliberate practice-aligned activities showed a 3.61× advantage in learning efficiency.
• Despite comprising less than 10% of player time, deliberate practice yielded superior learning outcomes.

Conclusions:

• Training methods, not just duration, critically influence skill development trajectory.
• Objective data supports the significant impact of deliberate practice on expertise.
• Targeted deliberate practice strategies are more effective for skill acquisition than extensive gameplay.