1.
[
{B:r7/8/8/8/8/2R5/n7/Nn1K1k2}
{V:In order to win an ending without pawns, it is usually not enough to be a minor piece up. It follows that the material balance in the diagram should lead to a draw, but White's problem is that his rook is under attack, and after it moves Black will play ...Nac3+ winning the knight on a1. Two extra pieces is certainly enough to win, unless there is an immediate draw for some reason. Find white's move that leads to a draw.;c3f3;Correct;Incorrect.;The clue is the last sentence in the question. White has to find a way to lose his knight in such a way as to set up a tactical defense. Remember than a king and two knights cannot win against a lone king, so if the rooks were exchanged ...}]

2.
[
{B:r7/8/8/8/8/2R5/n7/Nn1K1k2}
It is essential to drive the king further away before doing anything else, since 1 Rc2?, for example, is met by 1...Rd8+ and mate next move.]

3.
[
{S:c3f3}
1 Rf3+!]

4.
[
{S:f1g2}
1...Kg2
Black must keep up the attack on White's rook. After the tame 1...Kg1, White rescues his knight with 2 Nb3 and Black has no special tricks, so the position is drawn.]

5.
[
{S:f3b3}
2 Rb3!
White's drawing idea depends on a lateral check, and this is the only way for the rook to reach the second rank. It also explains why the immediate 1 Rb3? wouldn't have worked.]

6.
[
{S:a2c3}
2...Nc3+
Black continues with his plan.]

7.
[
{S:d1c1}
3 Kc1!]

8.
[
{S:a8a1}
3...Rxa1]

9.
[
{S:b3b2}
4 Rb2+]

10.
[
{S:g2g1}
4...Kg1
It doesn't make any difference where Black moves his king. The critical moment has arrived, so this is your last chance to spot the spectacular drawing idea.]

11.
[
{S:b2a2}
5 Ra2!!
An incredible double rook offer. If Black plays 5...Rxa2 then White is stalemated, so in order to avoid losing his own rook Black has to play ...]

12.
[
{S:c3a2}
5...Nxa2+]

13.
[
{S:c1b2}
6 Kb2
A visual position. Black's poor rook is caught in the deadly embrace of the black knights, White will take the rook next move, giving rise to the drawn ending of king and two knights v king.]
