How did Bobby Fisher study chess?

Bobby Fischer had a distinctive and deeply analytical approach to studying chess. He was known for his consistency in playing the same opening moves for an extended period. For 17 years, he played exactly the same opening moves, daring his opponents to outplay him with that limited repertoire. However, just before his decisive matches, notably his World Championship match against Boris Spassky, Fischer expanded his study to different openings outside his usual repertoire. This strategic shift took his opponents by surprise, as they had prepared based on his historical games 1 2.

Additionally, Fischer's preparation involved playing over games and constantly analyzing them, even engaging in speed chess to sharpen his reflexes and strategies. He would also discuss his moves and strategies with friends, correcting and refining his approach based on real-time feedback 2.