If Tal sacrifices a piece, take it. If Petrosian sacrifices a piece, don't take it.
Every great master will find it useful to have his own theory on the openings, which only he himself knows, a theory which is closely linked with plans for the middle game.
Chess is the art of analysis.
Chess cannot be taught. Chess can only be learned.
A knight ending is really a pawn ending.
In short, we can see Karpov as an exploiter of other people’s ideas. His ability to use these ideas is not at issue, but he himself is about as fertile as a woman who has been sterilized is.