Leading to great complications. White sacrifices a pawn for a lead in development
and attacking chances.
6...Bxg5 7.hxg5 Qxg5 8.Nh3 Qe7 9.Nf4 a6 to allow ...c5 without concern for Nb5.
10.Qg4 g6
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11.0-0-0
[White could also try an immediate 11.Qg3 with the idea of sacrificing at d5.
For example, 11...c5 12.Ncxd5 exd5 13.Nxd5 Qd8 14.e6]
11...Nc6
[11...Nb6 is the better move.
]
12.Bd3 Nf8 to stop sacrifices at g6.
[12...Nxd4 13.Nfxd5 exd5 14.Qxd4 c6 15.e6 is unclear.]
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13.Qg3 anticipates Black's desire to castle long and gets the queen
off the h3-c8 diagonal in preparation for a sacrifice on d5.
[13.Nh5 is another interesting possibility, to get the knight into f6.
If you know where you want to go, you should look for unlikely ways to get there.
But Black can decline with 13...Nd7, or try to hang on with 13...gxh5 14.Qg7 Ng6 15.Bxg6 Rf8]
13...Bd7? Black plays the obvious, but losing move.
He does not realize White's plan.
14.Ncxd5 exd5 15.Nxd5 Qd8 16.Nf6+ Ke7
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17.d5!
builds a mating net and clears the fourth rank, giving White the option of swinging the queen
over to the queen side.
17...Qc8 to make an escape square.
[If 17...Nb4 18.Qh4 with the idea Nxh7+. (18...Nxa2+ 19.Kb1)
Black's dark squares are weak.]
18.Qh4 Ne6 Black hopes to survive by giving something back.
