1.
[
{B:N7/8/N7/k7/1b6/1K6/p7/6B1}
{V:White has two extra minor pieces, normally enough to win, but Black's pawn on a2 is very dangerous since 1 Kxa2? would be met by 1...Kxa6 leading to a drawn ending of bishop and knight against bishop. White to play and win.;a6c7;Correct;Incorrect.;This study is quite tricky, because White's initial attack is countered by an ingenious stalemate defense based on opposing bishops. Only precise play by White turns the tables, with stalemate being transformed into mate.}]

2.
[
{S:a6c7}
1 N6c7!
Threatening mate in one and giving Black no time to promote to a queen. Black can only avoid immediate mate by underpromoting.]

3.
[
{S:a2a1}{X:a1}{P:BNa1}
1...a1N+!
Now White cannot maintain the mating net, so he changes plan by heading for the trapped knight in the corner. An advantage of one minor piece isn't enough to win, but two minor pieces up would be too much for Black.]

4.
[
{S:b3b2}
2 Kb2]

5.
[
{S:a1b3}
2...Nb3!
Rather than just sit there waiting to be taken, the knight sacrifices itself to draw the White king into the right position for a stalemate defense.]

6.
[
{S:b2b3}
3 Kxb3
The position is the same as two moves ago, except that Black's pawn has disappeared. Surprisingly, this helps Black because he is now able to play for stalemate.]

7.
[
{S:b4c5}
3...Bc5
Not only stopping the mate on b6, but almost trapping White's bishop.]

8.
[
{S:g1h2}
4 Bh2]

9.
[
{S:c5g1}
4...Bg1
The alternative is 4...Bd6, aiming for a different perpetual attack against the bishop, but White has the reply 5 Nb6! Bxh2 (otherwise White ends up with the winning ending of bishop and knight against a lone king) 6 Nc4 mate.]

10.
[
{S:h2f4}
5 Bf4!!
White cannot use the same 5 Nb6 trick here because Black can reply with either 5...Kxb6 or 5...Bxb6. First of all the bishop must be lured onto the correct square.]

11.
[
{S:g1e3}
5...Be3
Black's bishop is like an unwelcome guest who simply won't go away, but White has found the trapdoor.]

12.
[
{S:a8b6}
6 Nb6!
Now if 6...Kxb6 (6...Bxf4 7 Nc4 mate), White reveals the point of enticing the bishop to e3, 7 Nd5+ followed by Nxe3. The only alternative is ...]

13.
[
{S:e3b6}
6...Bxb6
...but now there is no escape for Black's king.]

14.
[
{S:f4d2}
7 Bd2 mate.]