will win the Rook by R-d1.

+---------------------------------------+
8 | | | | #R | #K | | | #R |
|---------------------------------------|
7 | #P | #P | | | | #P | #P | #P |
|---------------------------------------|
6 | | | | | #B | | | |
|---------------------------------------|
5 | | | | | #P | | | |
|---------------------------------------|
4 | | | | | ^P | | | |
|---------------------------------------|
3 | | | | | | | | |
|---------------------------------------|
2 | ^P | ^P | ^P | | | | ^P | ^P |
|---------------------------------------|
1 | | | ^K | ^R | | ^B | | ^R |
+---------------------------------------+
a b c d e f g h

DIAGRAM 39.

In the position of Diagram 40 there is also a possibility of a
sacrifice with the view to pin a piece that defends a certain
threat as long as it is mobile. White plays (1) Q-d5, and Black
dares not take White's Knight with his Queen for White would
continue (2) Qxf7+, Rxf7; (3) R-e8+/-.

What Black could try is (1) Kt-h6.