The way in which White Would Obtain the Advantage
The way in which White would obtain the advantage is this:
(1) R-e1 B-f5
(2) Rxe4 Bxe4
(3) R-e1
Through sacrificing one Rook for the Knight White has freed the
square e1 for the other Rook who now pins the Black Bishop
without Black being able to protect it.
The position of Diagram 39 is somewhat related to that of Diagram
38, as far as the possibility of a sacrifice for the sake of a
pin is concerned. If White plays B-b5+ Black must not interpose
his Bishop, for White will give up his Rook for the Bishop in
order to force the Rook d8 into a pinned position and then he
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.
+---------------------------------------+
8 | #R | | #B | #Q | | #R | #K | |
|---------------------------------------|
7 | #P | #P | | #P | | #P | #P | #P |
|---------------------------------------|
6 | | | | #P | | | | |
|---------------------------------------|
5 | | | | | | #Kt| ^Kt| |
|---------------------------------------|
4 | | | ^B | | ^R | | | |
|---------------------------------------|
3 | | | | | | | | |
|---------------------------------------|
2 | ^P | ^P | | | | ^P | ^P | ^P |
|---------------------------------------|
1 | ^R | | | ^Q | | | ^K | |
+---------------------------------------+
a b c d e f g h
DIAGRAM 40.
The Pawn f7 would then be three times attacked and three times
protected so that White cannot take him as now the pin of the
Rook resulting from Ktxf7, Ktxf7; Qxf7, Rxf7 does not lead to
anything, the square e8 being protected by the Queen.
However, White can force the win by (2) Ra1- e1, threatening again the
sacrifice of f7, as he now controls the square e8 twice. If Black
replies (2) ..., Q-f6, protecting f7 for the fourth time and
thereby making impossible White's sacrifice on that point, White
continues with (3) R-e8. This threatens Rxf8+, Kxf8; Ktxh7+
winning the Queen. Black cannot defend himself with Q-g6 on
account of (4) B-d3 followed by Bxh7+ and Rxf8, etc., nor can he
play (3) ..., Q-f4 on account of P-g3 followed by Qxd6, attacking
the defenseless Rook f8.
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