9.Q to K 49.P to Q Kt 4
10.B to Kt 310.P to B 4
11.Kt takes P11.B to R 3
12.P to Q R 412.R to B sq.
13.P to Q 313.B to K 2
14.Castles...

White threatens now a formidable attack with 15. P to K B 4, to be followed by attacking the Knight with the Q B P, and so to win back the piece.

...14.B to Kt 2
15.P to Q B 315.P to Q R 3

If 15. ... Kt to R 3, White would win with 16. P to K B 4.

16.Q to Kt 4: ch.16.K to B 2
17.P to K B 417.R to B sq. (best)
18.P takes P: dis. ch.18.K to Kt sq.
19.B to R 6 (!)19.R takes R: ch.
20.R takes R20.B to B sq.
21.Kt to Q 6, and wins.

For the immediate threat, 22. Q to K 6: ch., or Kt takes B, is fatal.

Third Variation.
Repeat the Opening up to Black's 5th move.