Chess Opening Secrets Revealed*: Chess: Understanding the Open Catalan Part I

1 d4 Nf6 2 c4 e6 3 g3 d5 4 Bg2 dxc4 Line

Also available:
Chess: Understanding the Open Catalan Part II
http://chesscoach1950.blogspot.com/2006/09/chess-understanding-open-catalan-part.html
Chess: Understanding the Open Catalan Part III
http://chesscoach1950.blogspot.com/2006/09/chess-understanding-open-catalan-part_26.html

1 d4

1 ... Nf6

2 c4

2 ... e6

3 g3

3 ... d5

3 ... Bb4+
3 ... c5
3 ... Be7
3 ... Nc6
3 ... c6
3 ... b5
3 ... b6
3 ... e5
3 ... Ne4

4 Bg2

4 Nf3
4 Nc3
4 cxd5

4 ... dxc4

4 ... Be7
4 ... Bb4+
4 ... c6
4 ... Nbd7
4 ... c5
4 ... Nc6
4 ... b6
4 ... a6
4 ... Bd6

5 Nf3

5 Qa4+
5 Na3
5 Nc3

5 ... Be7

5 ... a6
5 ... c5
5 ... Bd7
5 ... Be7
5 ... Nbd7
5 ... b5
5 ... Bb4+
5 ... c6

6 O-O

6 Qa4+
6 Nc3
6 Ne5
6 Qc2

6 ... O-O

6 ... Nbd7
6 ... c5
6 ... a6
6 ... Nc6

7 Qc2

7 a4 Nc6.
7 Nbd2 b5.
7 Nc3 Nc6 8 e3.
7 Na3 Bxa3 8 bxa3.
7 Ne5 Nc6 8 Nxc6 bxc6.
7 Qa4 a6 8 Qxc4 b5 9 Qc2 Bb7.

7 ... a6

7 ... b5 8 a4.
7 ... Bd7 8 Ne5 Bc6 9 Nxc6 Nxc6 10 e3.
7 ... Nbd7 8 Qxc4 c5 9 Rd1 a6 10 Qc2.
7 ... c5 8 dxc5 Qc7 9 Qxc4 Qxc5 10 Qxc5 Bxc5.
7 ... Nc6 8 Qxc4 Qd5 9 Nbd2 Rd8 10 e3 Qxc4 11 Nxc4.

8 a4

8 Qxc4 b5 9 Qc2 Bb7.
8 Nbd2 b5 9 Ng5 Ra7.
8 Bg5 b5 9 Bxf6 Bxf6 10 Ng5 Bxg5 11 Bxa8 Qxd4
12 Bg2.
8 Rd1 b5 9 Ng5 c6 10 e4 h6 11 Nh3 c5 12 dxc5 Qc7
13 e5 Nd5.

8 ... Bd7

8 ... Nbd7 9 Nbd2 c5.
8 ... a5 9 Qxc4 Na6 10 Nc3.
8 ... b6 9 Ne5 Ra7 10 Rd1 Bb7 11 e4.
8 ... Nc6 9 Qxc4 Qd5 10 Nbd2 Rd8 11 e3.
8 ... c5 9 dxc5 Nc6 10 Na3 Bxc5 11 Nxc4 Qe7
12 Nfe5 Nxe5 13 Nxe5 Nd5.

9 Qxc4

9 Rd1 Bc6 10 Nc3.
9 Nbd2 Bc6 10 Nxc4.
9 Bg5 Bc6 10 Qxc4 Bd5.
9 Ne5 Bc6 10 Nxc6 Nxc6 11 e3 Na5 12 Nd2 c5
13 dxc5 Rc8 14 b4 cxb3 15 Nxb3.

9 ... Bc6

9 ... Nc6

10 Bg5

10 Nbd2
10 Bf4
10 Rd1 Bd5.
10 Nc3 b5 11 Qd3 b4 12 Nb1 Be4 13 Qd1.

10 ... Bd5

10 ... b5 11 Qc2 Be4 12 Qc1.
10 ... h6 11 Bxf6 Bxf6 12 Nc3.
10 ... Nbd7 11 Nc3 h6 12 Bxf6 Nxf6.
10 ... a5 11 Nc3 Na6 12 Bxf6 Bxf6 13 e4 Nb4 14 Rfd1 b6.

11 Qd3

11 Qc2 Be4 12 Qc1.
11 Qc1 Nc6 12 e3.

11 ... Be4

11 ... Nc6
11 ... h6
11 ... c5 12 dxc5 Nbd7 13 Nc3 Nxc5 14 Qe3.

12 Qd1

12 Qd2
12 Qd1
12 Qc4 Bd5.
12 Qe3 Nbd7 13 Nc3 Bc6.

12 ... c5

12 ... Bc6
12 ... Nbd7 13 Nc3 Bc6 14 Qc2.
12 ... h6 13 Bxf6 Bxf6 14 Nc3 Bxf3 15 Bxf3.
12 ... Nc6 13 Nbd2 Bg6 14 Rc1 h6 15 Bxf6 Bxf6.

13 dxc5