I could see the main plan almost immediately, but some calculation is required. White wants that c-pawn cleared out of the way so that the bishop can get at black’s king, so….

1. Nb5!

Threatens Nd6+ with all sorts of nasty ideas involving discovered checks and captures of the f8 rook etc. 1.Nb4 also attacks the black queen directly forcing black to deal with it. Black can either retreat the queen to b8 and give her up at d6 when the knight checks, or black can take the knight now:

1. ……cb5 (best defense by far) 2. Bb5

Black can’t block this check with the knight since it is pinned to the queen at c7, so it must be blocked with the bishop….

1.Nb5 cxb5 (1…. Qb8 2.Rd8+ Kxd8 3.Qxf8+ Kd7 4.Rd1+ Nd5 5.Bxd5 cxd5 6.Rxd5+ Ke6 7.Rd6+ Qxd6 8.Qxd6+ Kf7 9.Nc7and the R also goes.) (1…. Qb6 2.Nd6+ and what black can do?) 2.Bxb5+ Bd7 3.Bxd7+ Qxd7 4.Rxd7 Kxd7 White has won Q for R and N.Black’s position is also not dynamic enough to survive the material deficit.I don’t find any quick win for white.Probably 5.Qxe5 seems good creating central passed P for dynamic thrust.If 5… Rxf2 6.Rd1+ Ke8 will discoonect the 2 Rs.

1.Nb5! Wins for White! A>1…..cxb6.2.Bxb5+!. A1>2….Bd7.3.Bxd7+! A11>3…Kd8.4.Qxf8#! A12>3…Qxd7.4.Rxd7!!.Kxd7.5.Rd1+!.Kc6.6.Qxe7! And W has a Q for a R with an easy win! A2>2….Qc6.3.Bxc6+!.bxc6 and W has a Q for N+B with a continuing mating attack! A3>2….Qc7.3.Bxd7+!.Bxd7.4.Rxd7! And W wins as in variation A12!

B>1…Qb8.2.Nd6+!. B1>2…Qxd6.3.Rxd6! And W has a Q for N with a easy win! B2>2…Kd8/7.3.Qxf8 and W has a free R with a devastating attack for an easy win!

C>1….Qb6/a5,2.Nd6+!.Kd7/8.3.Qxf8 for an easy win as in B2!

In the sideline I missed a mate. 1.Nb5 Qb8 2.Rd8+ Kxd8 3.Qxf8+ Kd7 4.Rd1+ Nd5 5.Bxd5 cxd5 5…… cxb5 6.Qf7+ Kd8 7.Bc6+ Qd6 8.Rxd6+ Bd7 9.Qxd7# 6.Rxd5+ Ke6 7.Nd6 here I had suggested 7.Rd6+ but you have to retain R for the mate 7…. Qc7 to prevent 8.Qf7# 8.Ne8 Qe7 9.Qf6# was threatened 9.Ng7+ Qxg7 10.Rd6# This may be irrelevant as it is a sideline.

I could see the main plan almost immediately, but some calculation is required. White wants that c-pawn cleared out of the way so that the bishop can get at black’s king, so….

1. Nb5!

Threatens Nd6+ with all sorts of nasty ideas involving discovered checks and captures of the f8 rook etc. 1.Nb4 also attacks the black queen directly forcing black to deal with it. Black can either retreat the queen to b8 and give her up at d6 when the knight checks, or black can take the knight now:

1. ……cb5 (best defense by far)

2. Bb5

Black can’t block this check with the knight since it is pinned to the queen at c7, so it must be blocked with the bishop….

2. ……Bd7

3. Bd7 Qd7 (Kd8 4.Qf8#)

4. Rd7 Kd7

And white’s edge is decisive.

Nb5

Nb5!

Too hard!

Nb5 looks interesting!

Nb5 looks interesting!

Nb5

1.Nb5 cxb5(1…. Qb8 2.Rd8+ Kxd8 3.Qxf8+ Kd7 4.Rd1+ Nd5 5.Bxd5 cxd5 6.Rxd5+ Ke6 7.Rd6+ Qxd6 8.Qxd6+ Kf7 9.Nc7and the R also goes.)

(1…. Qb6 2.Nd6+ and what black can do?)

2.Bxb5+ Bd7

3.Bxd7+ Qxd7

4.Rxd7 Kxd7

White has won Q for R and N.Black’s position is also not dynamic enough to survive the material deficit.I don’t find any quick win for white.Probably 5.Qxe5 seems good creating central passed P for dynamic thrust.If 5… Rxf2 6.Rd1+ Ke8 will discoonect the 2 Rs.

1. Nb5 cxb5

2. Bxb5 Bd7

3. Bxd7 and mate or lose the queen.

If 1. Nb5 Qc6

2. Nd6+ and black is almost dead.

If 1.Nb5 Qb8

2. Rd8+ Kxd8

3. Qxe8++

I pondered for a while about black’s plan Nd5 to enforce exchange of queens, and thought “if only a knight move could prevent this”, when I found:

1. Nb5! cxb5

The alternative was to move Q and allow Nd6+ followed by Qxf8. Hopeless. Must at least cost a rook.

2. Bxb5+ Bd7 (Nc6 Qxc7 or Qc6 Bxc6 was Q loss directly)

3. Bxd7+ Qxd7 (Enforced. Kd8?? Qxf8#)

4. Rxd7 Kxd7

5. Rd1+ …

6. Rd5! …

7. Rxe5

game over.

Kb5

Nb5 cb ; Bb5

Nb5 cb ; Bb5

Nb5 cb ; Bb5

Nb5

1. Nb5 Qa5 2. Nd6+ Kd7 3. Qxf8 etc. 1-0

1.Nb5! Wins for White!

A>1…..cxb6.2.Bxb5+!.

A1>2….Bd7.3.Bxd7+!

A11>3…Kd8.4.Qxf8#!

A12>3…Qxd7.4.Rxd7!!.Kxd7.5.Rd1+!.Kc6.6.Qxe7! And W has a Q for a R with an easy win!

A2>2….Qc6.3.Bxc6+!.bxc6 and W has a Q for N+B with a continuing mating attack!

A3>2….Qc7.3.Bxd7+!.Bxd7.4.Rxd7! And W wins as in variation A12!

B>1…Qb8.2.Nd6+!.

B1>2…Qxd6.3.Rxd6! And W has a Q for N with a easy win!

B2>2…Kd8/7.3.Qxf8 and W has a free R with a devastating attack for an easy win!

C>1….Qb6/a5,2.Nd6+!.Kd7/8.3.Qxf8 for an easy win as in B2!

In the sideline I missed a mate.

1.Nb5 Qb8

2.Rd8+ Kxd8

3.Qxf8+ Kd7

4.Rd1+ Nd5

5.Bxd5 cxd5

5…… cxb5 6.Qf7+ Kd8 7.Bc6+ Qd6 8.Rxd6+ Bd7 9.Qxd7#

here I had suggested 7.Rd6+ but you have to retain R for the mate6.Rxd5+ Ke6

7.Nd6

to prevent 8.Qf7#7…. Qc7

8.Ne8 Qe7

9.Qf6# was threatened

9.Ng7+ Qxg7

10.Rd6#

This may be irrelevant as it is a sideline.