Queen's Gambit Declined

In this book Grandmaster Sadler explains the ideas behind the Queen's Gambit Declined, one of Black's most dependable replies to the queens pawn. He

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Queen's Gambit Declined - Orthodox Variation

opening - In the Queen's Gambit Declined, why is 5.e3 so much more popular than 5.Nf3 after 1.d4 d5 2.c4 e6 3.Nc3 Nf6 4.Bg5 Be7? - Chess Stack Exchange

Queen's Gambit Declined: Janowski Variation with GM Miloje Ratkovic - 365Chess

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