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Kornev: Rossolimo and Friends Turnier Masters of the Chessboard by Taktik Masters of the Chessboard by Richard Réti and Dvoretsky's Endgame Manual by Mark Dvoretsky are three that come to mind 3 Exchange Variation: 7 Nf3 White is practically deprived of the possibility to simplify the position by numerous exchanges As theoretical material they are not as huge as the Najdorf variation
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