Here is the weakness.  White first provides against Black’s P-Q4, and then starts a sharp attack on the King’s side.

15.  B-Kt5 QR-Q1

P-Q4 at once is not feasible, because of BxKt.

          16.  PxP PxP
          17.  Q-B1

This brings the Q away from her file, which Black could now secure by P-Q4, followed by PxP.

          17. ...  KR-K1

The proper continuation is the one outlined in the note above.

          18.  P-R3

White has now ample leisure to prepare the advance of his KBP.

18. ...  R-R1 19.  RxR RxR 20.  Kt-R2 B-QB1 21.  P-KB4 Kt-K1 22.  P-B5 BxB 23.  QxB Q-K2

Black seeks salvation in exchanges, which White, of course, tries to avoid, having good prospects of driving home his attack.  His pieces are concentrated on the King’s side, whilst the Black forces are scattered, and unable to get back in time for the defence.  Moreover, it is likely that the weakness at Black’s KR3 and KB3 will prove fatal as the Black KB is exchanged.

24.  Q-R6            Q-B1
25.  Q-B1            Q-Kt2
26.  R-B1            P-Kt4

White was threatening to play Kt-Kt4 with PxP and Kt-R6.

27.  Kt-Kt4          Kt-B3
28.  KtxKtch         QxKt

One of the attacking Knights is eliminated.  But there is another, which forces the entry at KB6 and KKt6.

          29.  P-R4

to gain access for the White Queen at KR6.  If Black, captures there follows:  30.  Kt-R5, Q-Q1; 31.  Q-R6, Q-B1; 32.  Kt-B6ch, an instructive example of the weakness created by P-KKt3.

          29. ...  P-R3
          30.  Kt-R5 Q-Q1
          31.  P-B6

All this is easy to understand.

31. ...  K-R2 32.  PxP B-Kt5 33.  Kt-Kt7 K-Kt3 34.  B-Q1 Q-Q2 35.  Kt-B5 BxKt 36.  PxBch Resigns.

The conclusion might be:  K-R2; 37.  B-R5, PxP; 38.  QxP, R-KKt1; 39.  B-Kt6ch, PxB; 40.  Q-R4 mate.

Game No. 13

White:  Teichmann.  Black:  Schlechter.

Ruy Lopez (see p. 37).

Move 1-8 as in Game No. 12.

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

Diag. 118