8.  K-Kt2           K-Kt3
9.  K-R2            P-R5

Now neither PxP nor P-B4 is of any use.  In the first case Black obtains the distant passed pawn.  In the second White obtains the distant passed pawn after 10.  P-B4, PxBP; 11.  PxRP, but loses it again after K-R4; 12.  K-R3, P-B4.

10.  K-R3           PxP
11.  KxP            K-B4

At last Black has captured the coveted square, whilst keeping the spare move in hand.

          12.  K-B2 K-B5

The White King cannot move to Kt2 now, because in that case Black would move the King to the White QBP and queen in seven moves, and White, after seven moves, would only have the KB pawn at B7.

13.  K-K2           K-Kt6
14.  K-K3           P-B4

and wins, for White cannot hold the KBP now, but must capture the KtP in exchange for it, after which the Black King reaches the Queen’s side two moves ahead, e.g.: 

15.  K-K2 K-Kt7 16.  K-K3 K-B8! 17.  K-K4 K-B7 18.  K-B5 KxP 19.  KxP K-K6, etc.

Black would have forced a win also if White had played K-Kt2 on his twelfth move thus:  12.  K-Kt2, K-B5; 13.  K-B2.

Now White has the opposition, and after Black wrings it from him by playing the spare move P-B4, he assumes it again with 14.  K-K2, K-Kt6; 15.  K-K3.  But he cannot maintain it after Black’s K-R6 because the square at Q3 for distant opposition is not accessible.  After 16.  K-Q2, K-R7!; 17.  K-K3, K-Kt6; 18.  K-K2, K-Kt7; 19.  K-K3, K-B8 we get the same result as before.

II.  FROM A GAME ED. LASKER-ROTLEVI (HAMBURG, 1910).

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

Diag. 83.

White has the advantage, because Black must keep either his King or his Knight permanently near the passed pawn, guarding against its advance, whilst both White’s King and Knight can attack the Black pawns.  As yet they stand so far in the rear that the White King cannot approach them Therefore White must first try to force their advance.