5. ...  P-K3
6.  P-K4 PxP
7.  KtxP!

In view of the fact that Black’s position after BP or KPxP would be very promising, as all his pieces would be easy to bring into play, White decides upon the sacrifice of a pawn, in order to further his own development.

7. ...  BxP
8.  R-Kt1 B-Kt2
9.  Q-R4ch Kt-B3
10.  KKt-B3

Kt-Kt6, R-Kt sq; 11.  B-R5 leads to nothing, as Black plays 12.  QK2.

10. ...  P-KR3

If Black plays KKt-K2 at once, his position becomes somewhat cramped after 11.  B-Kt5, Castles; 12.  Kt-B6ch, K-R1; 13.  Q-Q1.

11.  B-Q3      Kt-K2
12.  Castles   Castles
13.  Q-B2      P-Kt3

This allows the development of the QB.

14.  B-B3      KtxKt
15.  KPxKt     Kt-K4

---------------------------------------
8 | #R |    | #B | #Q |    | #R | #K |    |
|---------------------------------------|
7 | #P |    |    |    |    | #P | #B |    |
|---------------------------------------|
6 |    | #P |    | #P |    |    | #P | #P |
|---------------------------------------|
5 |    |    | #P | ^P | #Kt|    |    |    |
|---------------------------------------|
4 |    |    | ^P |    |    |    |    |    |
|---------------------------------------|
3 |    |    | ^B | ^B |    | ^Kt|    |    |
|---------------------------------------|
2 | ^P |    | ^Q |    |    | ^P | ^P | ^P |
|---------------------------------------|
1 |    | ^R |    |    |    | ^R | ^K |    |
---------------------------------------
A    B    C    D    E    F    G    H

Diag. 164

Kt-K2 should have been played here in order to play BxB; 17.  QxB, B-Kt5 with Kt-B4, in answer to 16.  Q-Kt2.  Black is still open to attack in consequence of his broken King’s side, but there is no demonstrable advantage for White.  The text move is a mistake, and gives White chances of a decisive attack.

16.  KtxKt         BxKt
17.  BxB           PxB
18.  BxP!           Q-Kt4

Of course not PxB, on account of 19.  QxPch, K-R1; 20.  QxPch, K-Kt1; 21.  R-Kt3, etc. 18. ...  P-B4 fails because of 19.  R-Kt3.

          19.  B-K4 P-B4
          20.  P-B4!!

This elegant continuation decides the game.  If PxP, White simply plays 21.  B-Q3, and Black can hardly hope to save the end-game, as his pawns are broken up.  If the Queen retreats, however, there follows:  21.  PxP, and White obtains two passed pawns for the B and has the superior position.

20. ...  Q-Kt2 21.  PxP PXB 22.  RxRch QxR 23.  R-KB1 Q-Kt2 24.  QxP Q-Kt5 25.  R-B4 Q-Q8ch 26.  K-B2 Q-Q5ch 27.  QxQ PxQ 28.  P-K6 B-R3 29.  RxP R-B1ch

If K-B1, 30.  P-Q6.

30.  K-K3         R-B3
31.  K-K4         R-B7
32.  P-Q6         R-K7ch

He might play K-Q5, after which B-Kt2ch has points.