Exchanging queens will allow White to include
his king in the proceedings. However, Black
will not readily agree to that, so White has to
force him. Plan A (3 points) doesn’t do much,
as Black can defend with …Rc5 and/or sometimes
obtain counterplay with …e4. Plan B (8
points) also looks excellent, but Black might
get some counterplay after 47 Bf1 Rc1 48 Bb5
Rg1. The correct plan is C (20 points).

The game continued:
47 Ng5! Qd7
Or 47…Rc3+ 48 Kd2 Rc2+ 49 Kd3 e4+ 50
Nxe4.

48 Bf1!?
48 Nxe6+ Rxe6 49 Bxe6 Qxe6 50 Qxb7+
Kh6 51 a6 was also winning, but during the
game White was wrongly afraid of the possibility
of perpetual check after 51…Qg4.

48…Rc7
This looks like the only try, as 48…Rc1 49
Bb5 Qc8 50 Qe7+ leads to mate.

49 Bd3 Qc6 50 a4
The immediate 50 Qe4 was possible, but
White retains winning chances even in the endgame,
in case something goes wrong with his
attack.

50…Rd7 51 Qe4 Qc1+
The endgame after 51…Qxe4+ 52 Nxe4 Kf7
53 a6 bxa6 54 Bxa6 Ra7 55 Bb5 and Nd2-c4
would be a slow death.

52 Ke2 Qb2+ 53 Kf3 Qc3 54 Qxg6+ Kf8
55 Qf6+! Ke8 56 Qxe6+ Kd8
Or 56…Re7 57 Qg8+ Kd7 58 Qd5+ Ke8 59
Ne4.

57 Qg8+ Kc7
Or the beautiful 57…Ke7 58 Qf7+ Kd8 (if
58…Kd6, then 59 Ne4+) 59 Ne6+ Kc8 60
Qe8+ Rd8 61 Qxd8#.

58 Qc4+ 1-0

So ? What is the correct solution ?