FreeRepublic wrote on 10/08/22 at 18:05:50:
With the exception of the Dubov variation, this seems like the definitive work on the Tarrasch.
Kotronias appears to have put a lot of independent analytical effort into this book. I found one line where his work is complemented by prior work from Aagaard and Ntirlis.
After 1. d4 d5 2. c4 e6 3. Nc3 c5 4. cxd5 exd5 5. Nf3 Nc6 6. g3 Nf6 7. Bg2 Be7 8. O-O O-O 9. Bg5 c4 10. Ne5 Be6 11. Nc6 bc6 12. b3, Kotronias continues with 12...Qa5, whereas Aagaard and Ntirlis continue with 12...h6.
Part of the appeal of the QGD Tarrasch variation is the possibility that it can be played as a universal system against many lines and move orders. This has been claimed, but some are skeptical and I have not developed my own opinion.
The repertoire that I have been pursuing is:
QGD Tartakover, QGD Exchange variation, Catalan, Ragozin/Vienna.
I think it provides good chances for Black. However, I can see the appeal of just learning the Tarrasch QGD instead, even if Black may end up with an endgame that is objectively worse but adequate. Examples are a 4 vs 3 (pawns on kingside) rook endings or two bishops vs bishop and knight.