25. 20 25 30 35 40 45 50 7 8 9 10 11 12 13 Age IQ 115 IQ 130 Practice: 50 hours per year Practice: 50 hours per year Chess skill test The Role of Intelligence in Skill Acquisition
26. 20 25 30 35 40 45 50 7 8 9 10 11 12 13 Age IQ 115 IQ 130 Practice: 200 hours per year Practice: 50 hours per year Chess skill test The Role of Intelligence in Skill Acquisition