Becoming the opponent means you should put yourself in an opponent's place and think from the opponent's point of view.
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About Miyamoto Musashi
Miyamoto Musashi was Japanese swordsman, philosopher, strategist, writer, artist, and rōnin (c. 1583–1645). Miyamoto Musashi was a Japanese swordsman, strategist, artist and writer who became renowned through stories of his unique double-bladed swordsmanship and undefeated record in his 62 duels. Musashi is considered a kensei of Japan. Read more on Wikipedia →