Calli: I don't know, Here are Ed lasker's comments:
The intention is to strengthen the centre by P-QB3. Though it
takes a number of moves to bring the Knight into play again, yet
most of the tournament games in this variation have been won by
White, mostly through a King's side attack on the lines set out
in the notes to Game No. 22. Investigations by Alapin tend to
show that this is due to the fact that Black in all cases devoted
his attention to Queen's side operations (just as in Game No. 22)
when he could have utilised White's backward development, by
himself starting a counter attack on the King's side. He can then
either aim at the White centre at once with P-KB3, or else play
P-KB4 and prepare the advance of the KKtP by Kt-B3-Q1-B2. These
various lines of play are still under discussion. Simple
development is probably preferable to the move in the text, e.g.
7. B-Q3, Castles; 8. P-B4, P-QB4; 9. Kt-B3.
7. ... K-Q1
There can be no advantage in forfeiting the option of castling
unless there be no other way of getting the King into safety and
of bringing the Rooks into concerted action. It is obvious that
otherwise the free development of pieces is hindered, and the
King is in appreciable danger, for it is easier to open files in
the centre than on the wings where the pawns have not advanced
yet. Therefore Kt-Kt3 is the only move worth considering.
8. P-QB3 P-KB3
With the Black King remaining in the centre, White has no further
interest in the maintenance of his pawn at K5. On the contrary he
will try to clear the centre.
9. ... PxP
10. Q-Q2 P-B3
11. Kt-QR3 Kt-B1
At this early stage it is clear that Black will have to contend
with difficulties in trying to complete his development. The
usual way (P-QB4) is barred on account of the dangers to Black's
King with which a clearance in the centre is fraught.
12. Kt-B3 B-Q2
As Black can force this advance at any time by playing R-KKt1,
White decides to develop his KB at Kt2, thereby covering his KB3
and KR3. The weakness of the latter squares would not be of any
great moment if White were to castle on the Queen's wing. But as
P-QB4 is necessary in order to break up the centre, castling KR
is the right course.
13. ... B-K1
14. B-Kt2 QKt-Q2
15. P-B4 PxP
16. KtxP Kt-QKt3
17. KtxKt PxKt
18. Castles KR Kt-Kt3
19. KR-K1 B-Q2
20. Q-B3 R-K1
21. Kt-Q2 Q-B1
White wishes to get rid of the pawn at Black's Kt3, in order to
break in with his Knight at B5. Black has no means of preventing
this, and soon succumbs to the overwhelming array of White
22. ... Kt-K2
23. P-R5 P-QKt4
24. Kt-Kt3 Kt-Q4
25. BxKt KPxB
26. RxRch BxR
27. Kt-B5 Q-B2
28. R-K1 K-B2
29. Q-K3 B-Q2
30. Q-B4ch Resigns.
If K-Q1, 31. KtxPch followed by Kt-Q6ch. If K-B1 White wins by
31. Q-Q6 and R-K7.