"the most sound and popular variants seem to be the Tartakower and Lasker variations."
Probably not anymore since nowadays after 1. d4 d5 2. c4 e6 3. Nc3 Nf6, 4. cxd5 is the main move and 4. Nf3 is as popular as 4. Bg5, and after 4. Bg5 Be7 some spoilers play 5. e3 and try to avoid Nf3 for the time being.
The Sadler book is an excellent starting point, but the modern trend is to explore dozens of new relatively unexplored sidelines (especially in the QGD since it's a fundamentally sound system) and Sadler's books were always about mainlines.
Hi! I'm looking into learning a proper response to the Queen's Gambit as Black, and the most sound and popular variants seem to be the Tartakower and Lasker variations. I've heard lots of praise of Sadler's QGD treatise. Is that a good book to get for my purpose, or have there been enough developments since 2000 that I need to get a more recent book?
I'm also wondering what the main differences in style are between the Tartakower and the Lasker variations?
Cheers