Transposition to BDG from Caro Kann line...need analysis.

[Hagen]

I ran into this trap from a friend of mine who deliberately tried to set me up to fall for the BDG...which I emphatically don't like playing especially forced to using either color. I was Black and went for the Caro Kann but he still found a way to try and trick me into the BDG. The line went 1. e4 c6 2. d4 d5. So far so good but here's the annoying thing. White has at her/his disposal 3. Nc3 egging on for the BDG. That's what I faced on the third move...but I found what might probably be called a dubious novelty...but I was inspired by a line given in Tal's book and so I chose 3...b5?! immediately throwing a spanner into the works to throw him off. I would like it if someone could run a analysis of that move to see what the resulting lines look like and see what either Critter/Komodo/Stockfish/Rybka/Shredder etc think about it. Thanks. I lost the game but surprisingly my friend ran into a lot of problems when faced with that move. So just wondering what the analysis will show.

[Hagen]

I was surprised to learn by looking through my database there are about 100 games with the 3..b5 line. And apparently it has a variation named after it - the ECO lists it as B15b - Caron Kann:the Gurgenidze Counterattack. What really blew me away was seeing the percentages - according to my database (which is small because I filtered out the drawn games) White scores a surprisingly low 52%.

[Ted Summers]

These are the lines given from my Hiarcs13Pro opening book. I like off beat openings and this line is new to me. I think I will try it out after a little more study and some computer test games. Some positions I will look at with IDeA. Thanks for sharing this.

rn1q1rk1/p4ppp/2pbbp2/1p6/3P4/P1PB1Q2/1P2NPPP/R1B1K2R b KQ -

r6r/p2nkppp/2pbbp2/8/Pp1P4/3B4/1PP1NPPP/R1B2RK1 b - -

1. e4 c6 2. d4 d5 3. Nc3 b5 4. exd5 (4. a3 dxe4 5. Nxe4 Nf6 6. Nxf6+ exf6 7.
a4 (7. Nf3 Bd6 8. Bd3 O-O 9. O-O Bg4 10. a4 b4 11. c4 bxc3 12. bxc3 Nd7 13.
Be4 f5 14. Bxc6 Rc8 15. Bxd7 Rxc3)(7. c3 Bd6 8. Bd3 O-O 9. Qf3 Be6 10. Ne2 Bd5
11. Qh3 g6 12. O-O Nd7 13. a4 bxa4 14. Rxa4 Re8)7... b4 8. Bc4 Bd6 9. Qe2+ Qe7
10. Qxe7+ Kxe7 11. Ne2 Be6 12. Bd3 Nd7 13. O-O) 4... b4 5. Ne4 cxd5 (5...
Qxd5) 6. Nc5 Nf6 7. Nf3 e6 8. a3 bxa3 9. Rxa3 Nbd7 10. b4 Bd6 11. Bd3 O-O 12.
O-O Qc7 *

[Ted Summers]

Here is the analysis of Gull, Komodo, and Rybka 4.1

[FEN "rnbqkbnr/p3pppp/2p5/1p1p4/3PP3/2N5/PPP2PPP/R1BQKBNR w KQkq - 0 4"]


4. e5 (4. exd5 b4 5. Na4 cxd5 6. Nc5 Nf6 7. a3 bxa3 8. Rxa3 e6 9. b4 Qc7 10.
Nf3 a5 11. c3 Nbd7 12. Bd3 Nxc5 13. bxc5 Be7 14. O-O O-O {(0:19:24) 560740kN}
{[%eval 62,23,Deep Sjeng CT2010]}) 4... Nd7 (4... e6 5. Nf3 b4 6. Na4 Qa5 7.
b3 Nd7 8. Bd3 Ba6 9. O-O Bxd3 10. cxd3 Ne7 11. a3 Nf5 12. g4 Nh6 13. h3
{(0:17:33) 65971kN} {[%eval 60,21,Rybka 4.1 x64]}) 5. Nf3 b4 6. Na4 Qa5 7. c4
e6 8. Bd2 f6 9. cxd5 Qxd5 10. Rc1 fxe5 11. Bc4 Qd6 12. Qe2 exd4 13. Bxe6 Be7
14. O-O Ngf6 15. Bb3 d3 16. Qe3 Ng4 {(0:00:00) 623053kN} {[%eval 82,21,Gull
1.2 x64]} *

Gull 1.2 x64 [+0.82] d=21 4.e5 Nd7 5.Nf3 b4 6.Na4 Qa5 7.c4 e6 8.Bd2 f6 9.cxd5 Qxd5 10.Rc1 fxe5 11.Bc4 Qd6 12.Qe2 exd4 13.Bxe6 Be7 14.O–O Ngf6 15.Bb3 d3 16.Qe3 Ng4 (0:00:00) 623053kN

Deep Sjeng CT2010 [+0.62] d=23 4.exd5 b4 5.Na4 cxd5 6.Nc5 Nf6 7.a3 bxa3 8.Rxa3 e6 9.b4 Qc7 10.Nf3 a5 11.c3 Nbd7 12.Bd3 Nxc5 13.bxc5 Be7 14.O–O O–O (0:19:24) 560740kN

Rybka 4.1 x64 [+0.60] d=21 4.e5 e6 5.Nf3 b4 6.Na4 Qa5 7.b3 Nd7 8.Bd3 Ba6 9.O–O Bxd3 10.cxd3 Ne7 11.a3 Nf5 12.g4 Nh6 13.h3 (0:17:33) 65971kN