1.
[
{B:8/P7/6p1/6Pp/4R2K/8/p3B2p/6k1}
{V:This is another of those puzzles which depends only on tactics. The diagram position is already in a state of great tension. White has an extra rook and bishop, but no less than three pawns are about to promote. White to play and win.;e2f3;Correct;Incorrect.;In the main line, the first surprise is Black's second move, which gives away an apparently valuable pawn. The idea is revealed at move five, when White is unable to make the obvious capture. However, White turns the tables with his surprising sixth and seventh moves, after which Black is completely helpless.}]

2.
[
The most dangerous of the three pawns is Black's h-pawn, which threatens to promote with check. 1 a8Q? would even lose after 1...h1Q+ 2 Kg3 Qh2+ 3 Kf3 Qf2 mate. So White must take time out to cover h1, even though this allows the a1-pawn through.]

3.
[
{S:e2f3}
1 Bf3]

4.
[
{S:a2a1}{X:a1}{P:BQa1}
1...a1Q
This covers a8 but, unluckily for Black, White can promote in any case.]

5.
[
{S:a7a8}{X:a8}{P:WQa8}
2 a8Q
Apparently a very strong move, because after 2...Qxa8 3 Re1+ Kf2 4 Bxa8 Kxe1 5 Kh3 White is winning the ending, for example 5...Kf2 6 Kxh2 Ke3 7 Kg3 Kd4 8 Bc6 Ke5 9 Be8 Kf5 10 Kh4 and Black loses his pawns.]

6.
[
{S:h2h1}{X:h1}{P:BQh1}
2...h1Q+!
This finesse keeps Black in the game by setting up a stalemate possibility.]

7.
[
{S:f3h1}
3 Bxh1]

8.
[
{S:a1a8}
3...Qxa8]

9.
[
{S:e4e1}
4 Re1+]

10.
[
{S:g1h2}
4...Kh2!
Thanks to the preliminary promotion on h1, the black king has gained access to h2. Now Black threatens to take on h1, so White must act immediately.]

11.
[
{S:h1e4}
5 Be4!
Apart from acquiescing to a draw by taking on a8 this is the only move, but is a strong one, simultaneously cutting out Black's checks and setting up the threat of Rh1 mate.]

12.
[
{S:a8a1}
5...Qa1!
The only way to defend is by offering a second queen sacrifice ...]

13.
[
{S:e1b1}
6 Rb1!
... which is also declined. Curiously enough White has no threat, but Black to play can resign immediately. The only way for Black to avoid mate is to give up his queen by ...Qxb1, and this time White would definitely take it.]
