1.
[
{B:2B5/pR6/2pP1k2/8/6Kb/4p1P1/5p2/8}
{V:One of the attractive features of studies is that Black often shows as much ingenuity and guile as White, much as in a first-rate over-the-board game. In this study, both sides trade tactical blows until White, with his army reduced almost to its last man, lands the last punch. White to play and win.;d6d7;Correct;Incorrect.;Black's advanced pawns are a powerful force, and White's only chance is to generate counter-play using his own d-pawn. The end result is a kind of exchange - White's d-pawn for Black's f-pawn. A side effect is that White's rook gets trapped, but while Black is rounding it up White can make the decisive bishop maneuver.}]

2.
[
Black's advanced pawns are so strong that there is little point in defending passively, for example 1 Rb1? e2 is hopeless. White's only chance is counter-attack. {S:d6d7}1.d7]

3.
[
{S:f6e7}
1...Ke7
Forced, since after 1...f1Q 2 d8Q+ Ke5 3 Qa5+ Black has to give up his queen to avoid immediate mate.]

4.
[
{S:b7b8}
2 Rb8!
A neat tactical point. If Black plays 2...f1Q, then White wins by 3 d8Q+ Kxd8 4 Ba6+ Kc7 5 Bxf1 Kxb8 6 gxh4, followed by pushing the h-pawn.]

5.
[
{S:h4g3}
2...Bxg3!
In this study Black defends with great cunning. The obvious reply to this move is 3 Kxg3?, but then 3...f1Q 4 d8Q+ Kxd8 5 Ba6+ Kc7 6 Rb7+ Kc8 7 Rb6+ Kc7 8 Rb7+ Kc8 9 Rxa7+ Kb8 10 Rb7+ Ka8 leads to a draw, because Black can always meet Bxf1 by taking the rook, drawing because White has no pawns left.]

6.
[
{S:b8a8}
3 Ra8!
There are some tricky near-misses in this study, for example after 3 Rb4 f1Q 4 Re4+ White aims to promote with check, but Black replies 4...Be5! 5 Rxe5+ Kf6 6 d8Q+ Kxe5 bailing out to a drawn ending of queen and bishop against queen. The move 3 Ra8! threatens to blockade Black's pawns with Ba6, with a slow but sure win for White. Once again, Black finds a cunning defense.]

7.
[
{S:f2f1}{X:f1}{P:BQf1}
3...f1Q
Apparently allowing White to pick up the queen exactly as in the line given above.]

8.
[
{S:d7d8}{X:d8}{P:WQd8}
4 d8Q+]

9.
[
{S:e7d8}
4...Kxd8]

10.
[
{S:c8a6}
5 Ba6+]

11.
[
{S:g3b8}
5...Bb8!!
This is the reason why Black interpolated ...Bxg3. If White takes the bishop, the position is drawn just as after 3 Kxg3? above, for example 6 Rxb8+ Kc7 7 Rb7+ Kc8 and White cannot take the queen without losing his rook. So White has nothing better than the immediate capture of the queen, but now Black has White's rook firmly boxed in the corner.]

12.
[
{S:a6f1}
6 Bxf1]

13.
[
{S:d8c7}
6...Kc7
Intending simply ...Kb7 followed by ...Kxa8.]

14.
[
{S:f1a6}
7 Ba6
White does his best to combat Black's plan, but now the e-pawn, which has remained dormant for so long, finally emerges from hibernation to play a part in the proceedings.]

15.
[
{S:e3e2}
7...e2!]

16.
[
{S:a6e2}
8 Bxe2]

17.
[
{S:c7b7}
8...Kb7
One cannot help but feel sorry for Black, who has fought with tremendous resourcefulness, but fails just when he is on the threshold of forcing a draw.]

18.
[
{S:e2f3}
9 Bf3
Threatening 10 Bxc6+, so Black has no way out.]

19.
[
{S:b7a8}
9...Kxa8]

20.
[
{S:f3c6}
10 Bxc6 mate.]
