1.
[
{B:1B6/8/7P/4p3/3b3k/8/8/2K5}
{V:In this study it is White who has a dangerous passed pawn. How can White usher the pawn through to promotion? Win with white moving first. Try to do it on the board.;b8a7;Correct;Incorrect.;If Black can safely play ...e4, then the position will be a draw because his bishop will hold up the pawn long enough for the black king to round it up. White's one and only priority is to prevent ...e4 and he shouldn't shrink from unconventional methods to achieve this aim.}]

2.
[
The battle revolves around whether or not Black manages to play ...e4. If he succeeds, then the h-pawn is stopped and Black's king will be able to deal with the pawn. The first few moves of the study are quite easy, because White has only one reasonable way to prevent Black's ...e4.]

3.
[
{S:b8a7}
1 Ba7!]

4.
[
{S:d4a1}
1...Ba1
Black must decline the sacrifice, because after 1...Bxa7 2 h7 the pawn runs home. If Black plays 1...Bc3, then 2 Kc2 transposes into the main line.]

5.
[
{S:c1b1}
2 Kb1]

6.
[
{S:a1c3}
2...Bc3]

7.
[
{S:b1c2}
3 Kc2]

8.
[
{S:c3a1}
3...Ba1
Black's moves are forced. White has transferred his king from c1 to c2 with gain of tempo, but now he appears to be at a dead end, since after 4 Kd3 Black just plays 4...e4+ 5 Kxe4 Kh5, with an easy draw. In all the best studies, there comes a moment when it seems utterly impossible for White to reach his target. This is usually the point at which the composer has hidden his main idea.]

9.
[
{S:a7d4}
4 Bd4!!
An amazing double bishop sacrifice. After 4...exd4, Black's pawn has been deflected one square closer to White's king, allowing the reply 5 Kd3 sealing the diagonal shut, followed by 6 h7.]

10.
[
{S:a1d4}
4...Bxd4
Taking the bishop this way doesn't help.]

11.
[
{S:c2d3}
5 Kd3
Now Black cannot play 5...e4+ because his bishop is vulnerable on d4, so White gains a vital tempo to block the diagonal.]

12.
[
{S:d4a1}
5...Ba1]

249.
[
{S:d3e4}
6 Ke4
...followed by 7 h7 and 8 h8Q.]
