6.  KtxP P-KB4

As the KB obtains a long diagonal at Kt2, this advance is justified.  Otherwise there would be strong objections to it, as the pawn is likely to be subjected to attack, and apart from that, it gives up command of Black’s K4.

          7.  Kt-QB3

Kt-Kt3 would seem more natural, firstly, because Black has weaknesses on the K side, and White will need his pieces for attack in that quarter, and secondly, because the QP ought to be supported by P-B3, as Black will attack it by B-Kt2.

7. ...  B-Kt2
8.  Kt-B3 Castles
9.  B-B4

If now the Knight were at Kt3, White could play P-B3 and BQ3.  This is the proper place for the B, which might obtain an open diagonal after P-KKt4.

9. ...             Kt-B3
10.  Kt-K2          Kt-R4
11.  B-Q3           P-B4
12.  P-B3           P-QB5

P-Kt3 seems preferable, as the text move releases the hold on White’s Q4.  The isolated pawn resulting after 13.  PxP is not to be feared, as the B at Kt2 would have greater efficiency (QR-Kt1), and White would not be so firmly established in the centre.

13.  B-B2 P-Kt4
14.  Q-Q2

There now ensues an interesting struggle.  White builds up an attack with Q and both Knights and eventually the B (P-KKt4).  If Black can manage to play his King into safety at R1 in time, and then occupies the Kt file with his Rooks, he would have the better of it, his pieces having by far the greater range of action.

14. ...                B-Kt2
15.  Q-B4              Q-B3

K-R1 and KR-Kt1 might be considered.

16.  Kt-Kt3 B-KR3
17.  Q-B7 Q-Q1
18.  Q-K5

White gains a move by attacking the Knight’s Pawn.  It may seem far fetched if I now point out that this could not have happened if from the first Black had given preference to the pawn formation at QKt3 and B4 instead of Kt4 and B5, though the whole game would almost certainly have taken a different course.  Still, when advancing a pawn into an unprotected position there always is the risk of its becoming the object of an attack at an opportune moment, and whenever the plan of development does not necessitate such moves they are best avoided.

18. ...  B-Q4
19.  Kt-R5 Kt-B3?
20.  Q-Kt3ch??

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

Diag. 134