This was one part of the theory a few guys and I put together.

This part deals with anything following 1...d5 2.Bg2 Bxg4

1.g4 d5 2.Bg2 Bxg4 If 2...c6, refer to "Grob 1...e5/1...d5 Lines" 3.c4!! This move is great because it puts question to the d-pawn, which is pinned because of the weak b7. Black has many ways to counter, but not all of them work. 3...c6 [3...dxc4?! This is an interesting try for Black. He puts White on the defense but sacrifices material. 4.Bxb7 Nd7 5.Bxa8 Qxa8 6.f3 White has an extra pawn and the better pawn structure. He also has an open c-file that will put alot of pressure on Black's weak pawns. But Black has an annoying pin on the f3 pawn and also has the initiative. So if White can just neutralize Black's threats, he will have the better game. 6...e5 7.Nc3 Be7 8.d3 cxd3 9.Qxd3 And White is better. He will play e4, and will have an advantage. NOTE: If Black plays Bh4+, White replies with Kf1 and will eventually move the king to g2, with advantage.; 3...d4?! This is also like the move above, although a bit worse because Black doesn't take the extra pawn. 4.Bxb7 Nd7 5.Bxa8 Qxa8 6.f3 e5 7.d3 Be7 8.h4 Ngf6 9.Nh3 And White plans to play Nf2 next turn with advantage.; 3...e6 4.Qb3 Nf6 a) 4...dxc4?? 5.Qxb7 Nd7 6.Qxa8+-; b) 4...c6 5.Qxb7 Nd7 6.d4 Rb8 (6...Ne7 7.Nd2+/=; 6...Ngf6 7.Nc3+/=; 6...Bd6 7.Qxc6+/=) 7.Qxa7 Qc8 8.Bf4 Ra8 9.Qc7 Qxc7 10.Bxc7+/=; c) 4...Qc8 5.cxd5 c6 (5...exd5 6.Bxd5+-) 6.dxe6 If fxe6, White has the advantage due to his superior pawn structure. 6...Bxe6 7.Bh3!! Bxh3 (7...Bxb3?! Is very bad because of... 8.Bxc8 And Black has lost material and the initiative. 8...Bd5 9.Bxb7 Bxh1 10.Bxa8 Bd6 11.h3 Nf6 12.d4 Nbd7 13.Bb7 And the bishop will escape to d1 via a6.; 7...f5 8.Qe3 And White has a lot more comfortable of a game, as Black has ruined his pawn structure and evicted the knight of c6.) 8.Nxh3~~ Although White is doing very well. If... 8...Qxh3 then... 9.Qxb7!! seals the deal for Black.; 5.Qxb7 Nbd7 6.cxd5 exd5 (6...Rb8 7.Qxa7 exd5 8.Qe3+ Qe7 (8...Be7 9.Nc3+/=) 9.Qxe7+ Bxe7 10.d4+/=) 7.Qc6 Rb8 8.Nc3~~; 3...Nf6 4.Qb3 Bc8!! (4...c6 5.Qxb7 Nbd7 6.d4 e6 7.h3 Bf5 8.Nc3 Qc8 9.Qxc8+ Rxc8 10.cxd5 cxd5 11.f3~~; 4...e6 5.cxd5 exd5 6.Qxb7 Nbd7 7.Qc6 Rb8 8.Nc3 Rb6 9.Qa4 c6~~) 5.cxd5 And although Black is o.k., he has traded a center pawn for a g-pawn, so White is better.; 3...Be6 4.Qb3 Bc8 5.cxd5 And White has traded a g-pawn for a d-pawn, and stands better.; 3...e5 4.cxd5 White's center pawns and Black's weak b7 square give an advantage to White.] 4.Qb3 Qb6!! This move stops any plans White has against b7, but White has the brilliant... [4...Qc7 5.cxd5 cxd5?? a) 5...e6 6.dxc6 Nxc6 7.Nc3 Nf6 (7...Bd6?? 8.Nb5!!) 8.h3 Bf5 9.Nf3 e5 10.d3 And White has sound development. The better player will win this game.; b) 5...Nf6 6.Nc3 e6 (6...e5 7.h3 Bd7 8.d3 cxd5 9.Nxd5 Nxd5 10.Bxd5 Bc6 11.Bd2 Bxd5 12.Qxd5 And White is okay.) 7.h3 Bf5 8.e4 Bg6 9.dxe6 fxe6 10.Qxe6+ And White is by far better.; 6.Nc3 Nf6 (6...Nc6 7.Nxd5+/=; 6...e6?? 7.Qa4+!! And White wins the lonely bishop.) 7.Nxd5 Nxd5 8.Bxd5 And yet again, Black has too many threats to handle.; 4...Qc8 5.cxd5 e6 (5...cxd5 6.Nc3 Nf6 (6...e6 7.Qa4+) ) 6.dxe6 Bxe6 7.Bh3 This transposes to other lines.; 4...Qd7 5.cxd5 cxd5?? A HUGE error that costs Black. The alternatives are better. a) 5...e5 6.Nf3 Bd6 (6...f6 7.Nc3 Ne7 8.h3 Bh5 (8...Bxf3 9.Bxf3 cxd5 10.Nxd5+/=) 9.d4 Bxf3 10.Bxf3 exd4 11.dxc6 Nbxc6 12.Ne4 Ng6 13.Bd2 White has good open c and g-files) 7.Nc3 Nf6 8.Ng5 h6 (8...0-0 9.Nge4+/=) 9.Nge4+/=; b) 5...e6 6.f3 Bf5 (6...Bh5 7.dxe6 fxe6 8.Nh3+/=) 7.e4 Bg6 8.dxe6 fxe6+/= And White is in very good shape.; c) 5...Nf6 6.Nc3 Nxd5 7.Nxd5 Be6 (7...cxd5 8.Bxd5+/-) 8.e4 cxd5 9.exd5 Bf5 10.d4 g6 (10...a5 11.Nf3 a4 12.Qc4 Qd6 13.Ne5 Nd7 14.Bf4+/=) 11.Nf3 Bg7 12.Ne5+/-; 6.Bxd5+/- Now Black cannot defend both b7 and f7, and White will soon lead in material.] 5.Qxb6!! This is a never before seen move that puts a hold on Black's Qb6 idea. We immediately weaken Black's position, which can really hurt him in the endgame. 5...axb6 6.cxd5 cxd5 [6...Nf6 7.Nc3 e6 (7...cxd5 8.Nxd5 Nxd5 9.Bxd5 Nc6 10.a3+/=) 8.h3 Bf5 9.e4 Bg6 10.dxe6 fxe6 11.d4+/= And White is better.] 7.Bxd5 Nc6 8.d3 e6 [8...e5 9.h3 Bd7 10.Nf3 Nf6 11.Bb3 And White is doing fine.; 8...Nf6 9.Nc3 e6 (9...Nxd5 10.Nxd5 Rd8 11.Nxb6 e5~~) 10.Bc4 Bc5=] 9.Bb3 Nd4 [9...Nb4 10.Nc3 Nf6 11.h3 Bh5 12.Bg5 Be7 13.a3 Nc6+/=] 10.Bd1 Nf6 11.Nc3 Bb4 12.Bd2~~ *

This covers some alternatives that white may employ briefly.

1.g4 d5 (1...e5 2.e3 Nc6 [2...b6 3.Bg2; 2...d5 3.d4 exd4 4.Qxd4 Nc6 5.Qa4; 2...Qf6 3.Nc3] 3.Nc3; 1...d6 2.e3 e5 3.d3; 1...c5 2.e3 d6 [2...d5 3.Nc3] 3.d4; 1...g6 2.d4 Bg7 3.g5; 1...c6 2.Bg2 d5 transposes; 1...g5 2.d4 d5 3.Bxg5 Bxg4 4.Nc3 Nc6 5.Qd2 Bg7 6.0-0-0 Qd7 7.Bg2 0-0-0 8.Bxd5 Nxd4 9.Nf3) 2.Bg2 (2.e3 e5 [2...h6 3.d4; 2...e6 3.d4 c5 4.Nc3] 3.d4 Nd7 4.Bg2 c6 5.Nc3) 2...Bxg4 (2...c6 3.h3! e5 [3...h5 4.gxh5 Rxh5 5.d4 Nf6 6.Nd2 Bf5 7.Ngf3 e6 8.Nf1 Rh8 9.Ng3] 4.d4 [4.d3 Bd6 5.Nf3 Ne7 6.e3] 4...e4 5.c4 [5.Bf4!? untested] 5...Bd6 6.Nc3 Ne7 7.Bg5 f6 8.Bd2 0-0 9.Qb3 Kh8 10.0-0-0; 2...e5 3.d4 exd4 4.Qxd4 Nc6 5.Qxd5)

Some in-depth into 1.g4 e5 2.e3

1.g4 e5 2.e3 d5 3.d4 exd4 4.Qxd4 Nf6 5.h3 Nc6 6.Bb5 Bd7 7.Bxc6 Bxc6 8.Nf3 Ne4 9.Nbd2 f6 10.Nxe4 dxe4 11.Qxd8+ Rxd8 12.Nd4 Bd5 13.Bd2 and black is better, but white has compensation and counterplay.

5.g5? just does not work. White's play eventually runs out.

1.g4 e5 2.e3 d5 3.d4 exd4 4.Qxd4 Nf6 5.g5 Ne4 6.Nc3 Nxc3 7.Qxc3 Nc6 8.Bd2 Qxg5 9.0-0-0 Bd7 10.e4 Qe5 11.Qxe5 Nxe5 12.exd5 0-0-0 13.Be3 Kb8 14.Bg2 Bg4 15.Rd4 Bc5 16.h3 Bh5 17.Rh4 Bxe3+ 18.fxe3 g6 19.Rd4 Rhe8 20.e4 f6 and white has no counterplay in the endgame a pawn down. He is unable to develop the king's knight. It is only a matter of time before the position collapses.

More in-depth of 1.g4 d5 2.Bg2 c6

1.g4 d5 2.Bg2 c6 3.h3 e5 4.d4 e4 5.c4 Bd6 6.Nc3 Ne7 7.Bg5 f6 8.Bd2 is where our theory takes us.

They deviated away from our theory with 8...Bd7 instead of 8...0-0.

Silicon says 9.e3 is a possible improvement over 9.Qb3, but both moves are good in my opinion. There is a third possibillity in 9.Rc1 which looks like an even better move then both moves, although untested.

Some games I played.

1.g4 d5 2.c4 (my theory plays 2.Bg2 instead, but just an illustration)

http://www.chess.com/echess/game?id=31432498

I havbe a bunch in my archive if anyone with a premium account wants to look up the links.

I had a lot more to the theory, but it has been partially lost.

Sac and Attack

Super Admins

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