Bonzo Benoni
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1 d4 c5 2 d5(a) d6
  3 4 5 6 7 8 9 10 11 12 13 Evaluation
  Schmid Benoni Hempeater Variation
1 Nc3
g6
e4
Bg7
Nf3
Bc3!?
bc3
Nf6
Bb5
Bd7
Bd3
Bg4
0-0
Nbd7
 
 
 
 
 
 
 
 
=
  Three Pawn Attack Variation
2 e4
g6
f4
Bg7
Nf3
e6!
c4
ed5
cd5(b)
Ne7
Nc3
0-0
Be2
Bg4
0-0
Nd7
 
 
 
 
 
 
=
  Four Pawn Attack Variation
3 c4
g6
e4
Bg7
f4
f5!?
ef5
Bf5
Bd3
Qa5
Bd2
Qb6
Bf5
Qb2
Bc8
a5
 
 
 
 
 
 
  Kings Indian Hempeater Variation
4 ...
...
...
...
Nc3
Bc3
bc3
Qa5
Qb3
Nf6
Bd3
Nbd7
Nf3
Ng4
0-0
0-0
Be2
f6
 
 
 
 
  Anti-Hempeater Variation
5  
 
 
 
Nf3
Nd7
Qc2
Ne5
Nbd2
Nf3
Nf3
Bg4
Be2
Nf6
0-0
0-0
Be3
Nd7
 
 
 
 
=
a) 2 dxc5 e6 is easy equality. White should avoid the trap 3 b4? a5 4 c3 axb4 5 cxb4 Qf6.
b) 7 ed5 Ne7 8 Nc3 0-0 9 Bd3 Re8= is a solid alternative.

White: Akiba Rubinstein  •  Black: Rudolf Spielmann
Bad Pistyan 1912
  A43 Old Benoni Defense

Notes by Dr. Savielly Tartakower.
The building up of an attack by the second player - especially in an opening both peculiar and difficult to handle - is a special art. We shall be able to follow some its guiding principles here.

1 d4 c5
2 d5 d6
3 c4 g6
4 e4 Bg7
5 Bd3 e6

It will be noticed that Black carefully refrains from blocking the long diagonal either by 5 ... e5 or, even temporarily, by ; 5 ... Nf6.

6 Nc3 Ne7
7 Nge2

Here 7 f4 , followed by Nf3, leads to more straightforward development.

7 ... exd5
8 exd5 Nd7
9 f4 Nf6
10 Ng3 h5

Sounding the general attack.

11 O-O h4
12 Nge4 Nxe4
13 Bxe4 Bd4+
14 Kh1 Nf5

Black's attack has quickly assumed a concrete form. The text move announces the well-known attack by 15...Ng3+.

15 Bxf5 Bxf5
16 Re1+ Kf8
17 Qf3

White seeks to avoid fresh weaknesses; e.g., if 17 Be3 Bxc3 18 bxc3 h3 19 g3 Be4+ 20 Kg1 f5 or (20 ... Bg2 , and White's position remains restricted. )

17 ... h3
18 g3

Evidently not 18 g4?? Qh4

18 ... Qd7
19 Bd2 Bg4
20 Qf1 Qf5
21 Rac1 Kg7
22 Be3 Bf6
23 b3 Rhe8
24 Bf2 Bf3+
25 Kg1 Bg2
26 Rxe8 Bxf1
27 Rxa8 Qd3
28 Re8 Qf3
29 Kxf1 Qh1+
30 Bg1 Qg2+
31 Ke1 Qxg1+
32 Kd2 Qxh2+ 0-1

For if 33 Ne2 Qg2 34 Rg1 Qxg1! 35 Nxg1 h2 0-1 , etc.