1.c4
b6
2.d4
e6
3.Nf3
Nf6
4.e3
Bb7
5.Bd3
d5
6.b3
Bd6
7.0-0
0-0
8.Bb2
Nbd7
9.Nbd2
Ne4
10.Qc2
f5
11.Rad1
Nxd2
12.Nxd2
dxc4
13.Nxc4?
[13.Bxc4!
]
13...Bxh2+!
Definitely a correct sacrifice. Of course Black wants to get his attacking machine going with ...Qh4+ and a second bishop strike, followed by Rf6-h6 (g6), but this does not work without the superstrong quiet move on move 15 - so answer B) is right.
14.Kxh2
Qh4+
15.Kg1
Bf3!!
The real point. The bishop is untouchable (after 16.gxf3 Black wins with 16...Qg5+ followed by 17...Rf6), and the threats 16...Qg4 or 16...Rf6 force White to block his second rank - and then the second bishop strike will be good! [Tempting was of course 15...Bxg2
with the idea 16.Kxg2 Qg4+ and 17...Rf6 winning, but White cooly replies 16.f3!
Bxf1
17.Bxf1
and holds.]
16.Nd2
Now the second rank is blocked. [The alternatives were no better: 16.Be2
Bxg2
17.Kxg2
(17.f3
Qg3
) 17...Qg5+
18.Kh1
Rf6
; 16.e4
Rf6
and White is helpless against the threats 17...Rg6/Rh6.; 16.Rfe1
Rf6
17.gxf3
Qh3
]
16...Bxg2!
Now strong!
17.f3
[17.Kxg2
Qg4+
18.Kh1
Rf6
19.Qxc7
e5!
and Black checkmates. (not 19...Rh6+?
20.Qh2
) ]
17...Rf6
[17...Qg3?
18.Ne4
]
18.Nc4
[18.Kxg2
Rg6#
]
18...Bh3
[18...Bh3
and White resigned since there could follow 19.Qh2
(19.Rf2
Rg6+
20.Rg2
(20.Kh1
Bg2+
21.Kg1
Qh1#
) 20...Rxg2+
21.Qxg2
Bxg2
) 19...Rg6+
20.Kh1
Bg2+
21.Kg1
Bxf3+
] 0-1