Nimzowitsch explained this as a protected piece on the opponent’s side of the board that cannot be attacked by a pawn.
Karpov, Anatoly vs Kasparov, Garry 1-0 World Championship 35th-KK5 Rnd:17
Lyon/New York 1990.12.05
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Vasiukov hadn’t won a single game against me for 59 years and then suddenly won. I can’t call it shame. Shame or no shame, it’s a pity that he won…
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Chess is my hobby. I have been playing chess since five years old. I like to play chess, to help chess, sponsoring chess, and attract my business friends to chess in order to develop and popularize chess. Everybody has a hobby. My hobby is chess, boxing and Buddhism.
Kirsan Ilyumzhinov 2010