1.
[
{B:8/3k4/1K6/8/4BR2/4p3/4p3/8}
{V:Play white first. Find the move that leads to a win.;e4f5;Correct;Incorrect.;White has a large material advantage, but Black's e-pawn is about to promote. It is possible to stop Black's pawn after either bishop check, but one of the two checks allows Black to spring a diabolical trap. Black can lay the same pitfall after the other check, but this time there is a cunning refutation. Which one is correct?}]

2.
[
The most obvious move is 1 Bc6+?, because after a couple of checks White can take the e3-pawn with his rook. Unfortunately, this doesn't win because after 1...Ke6 2 Re4+ Kd6 3 Rxe3 e1Q 4 Rxe1 Black is stalemated. The solution starts with the other bishop check.]

3.
[
{S:e4f5}
1 Bf5+!]

4.
[
{S:d7d6}
1...Kd6 (or d8)
1...Ke7 2 Re4+ transposes to the main line.]

5.
[
{S:f4d4}
2 Rd4+]

6.
[
{S:d6e7}
2...Ke7
After 2...Ke5 3 Re4+ Kxf5 4 Rxe3 White wins with his extra rook.]

7.
[
{S:d4e4}
3 Re4+]

8.
[
{S:e7d8}
3...Kd8
Black again attempts to force stalemate, this time by 4 Rxe3 e1Q 5 Rxe1. White's next move avoids the trap and forms the main point of the study.]

9.
[
{S:f5d7}
4 Bd7!!
Amazingly, White makes no attempt to stop Black queening.]

10.
[
{S:e2e1}{X:e1}{P:BQe1}
4...e1Q
Black has no choice, since otherwise Rxe3 wins.]

11.
[
{S:d7b5}
5 Bb5!
Suddenly the trapper has been trapped himself. By blocking the b-file, the bishop has cut out any checks from Black's queen, and there is now no way of preventing mate by Re8.]
