9.  P-Q3          Kt-QR4
10.  B-B2          P-B4
11.  QKt-Q2        Q-B2

Supporting, as it does, the KP, this is not a lost move, although White has not played P-Q4.  It prepares Black’s P-Q4 (after Kt-B3), the KP being fully protected against White’s double attack by PxP.

12.  Kt-B1          Kt-B3
13.  Kt-K3          B-Kt2

The logical move would have been B-K3, to enforce P-Q4.  Black is then very well developed, whilst White labours under a somewhat undeveloped Queen’s side.  An attempt to exert pressure in the centre with P-Q4 in order to prevent Black’s P-Q4 would be belated.  Black would gain the advantage by:  l4. ...  KPxP; 15.  PxP, PxP; 16.  KtxP, KtxKt; 17.  QxKt, Kt-Kt5!  Nor would B-Kt5 before Kt-K3 be more successful; after B-K3; 14.  Kt-K3, QR-Q1; 15.  P-Q4, BPxP; 16.  PxP, PxP; 17.  KtxP, KtxKt; 18.  QxKt, Q-B4, Black has the better chances in the end-game.  The move in the text is not good because, as we saw before, the Bishop is wanted on the other diagonal to cover the square at KB4.

14.  Kt-B5          KR-K1
15.  B-Kt5          Kt-Q2

Even now it was desirable to aim at P-Q4, therefore QR-Q1 was preferable.

          16.  B-Kt3

The position of the White pieces points to a dangerous menace to the opposing King’s side.

          16. ...  Kt-B1
          17.  B-Q5!!

The beginning of a brilliant combination.  BxKt is threatened, and Black must first cover his B at K2.

17. ...            Kt-Kt3
18.  BxB           KKtxB

QKtxB is not feasible, because of BxB and KtxQP.

          19.  BxPch!!  KxB
          20.  Kt-Kt5ch

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

Diag. 119

Quite a number of charming combinations are hidden in this position.  If K-Kt3 or Kt1, then 21.  KtxKtP!  If K-B3 White can capture the RP first with check.

20. ...  K-Kt1 21.  Q-R5 KtxKt 22.  QxRPch K-B1 23.  QxKtch K-Kt1 24.  Q-Kt6!!!

The point.  This prevents P-Kt3, which would allow Black to bring up his Q for the defence at Kt2.  Now nothing can be done against the threatening R-K3-B3 or R3.