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

Diag. 12

and then attack it once more with his Knight, Black would appear
to have sufficient protection available, with his Kt and B. White
has no time to double Rooks, because if he does so, after his R-
K2 Black would play the King away from his file and allow the
Knight to escape.

But White can, by a simple sacrifice, bring the slumbering R at
R1 into sudden action:

1. ... KtxP; 2 R-K1, B-B4; 3. Kt-B3, Kt-Q3; 4. RxKt, KtxR; 5. R-
K1, and White wins two pieces for his Rook.

These illustrations will be sufficient to give the beginner an
understanding of economy of calculation in all kinds of
combinations. His power of combining will grow speedily on this