Gilchrist is a legend wrote on 05/22/10 at 14:09:59:
I see that both Vitiugov's book neither Moskalenko's Flexible French do not cover the isolated 3...c5 Tarrasch, viz. 1. e4 e6 2. d4 d5 3. Nd2 c5 4. exd5 exd5. Is there something wrong about 4...exd5 with the isolated pawn (after White will play ...dxc5)? I've always played against the Tarrasch like this, but it seems to be highly unpopular. In my opinion and experience, it seems to be a complete equaliser, unlike the Scandinavian hybrid 4...Qxd5.
Well, a few decades ago it was much more common than 4...Qxd5. It is perhaps generally regarded as a bit better for White with best play. One player that comes to mind who still plays it is Yusupov. Incidentally just a few days ago there was this:
[Event "ch-USA"]
[Site "Saint Louis USA"]
[Date "2010.05.18"]
[Round "5"]
[White "Kudrin,S"]
[Black "Kaidanov,G"]
[Result "0-1"]
[WhiteElo "2571"]
[BlackElo "2577"]
[EventDate "2010.05.14"]
[ECO "C09"]
1. e4 e6 2. d4 d5 3. Nd2 c5 4. exd5 exd5 5. Ngf3 Nc6 6. Bb5 Bd6 7. dxc5
Bxc5 8. O-O Nge7 9. Nb3 Bd6 10. Re1 O-O 11. Bg5 Bg4 12. Be2 Re8 13. c3 Qc7
14. h3 Bd7 15. Nbd4 a6 16. Bd3 Ng6 17. Qc2 Nf8 18. Nf5 Bxf5 19. Bxf5 h6 20.
Be3 Rad8 21. Rad1 Ne6 22. Qa4 Bf8 23. Qg4 g6 24. Bb1 h5 25. Qa4 Bg7 26. a3
d4 27. cxd4 Nexd4 28. Nxd4 Bxd4 29. Bxd4 Rxe1+ 30. Rxe1 Nxd4 31. Qb4 Rd6
32. Be4 b5 33. Kf1 Ne6 34. Bf3 Rd4 35. Qb3 Rd2 36. Rd1 Nd4 37. Qd5 Qh2 38.
Ke1 Rxb2 39. Qd8+ Kh7 0-1