9. ... Kt to K 4 would be unfavourable, because of 10. Kt takes Kt, P takes Kt; 11. B to R 3, B to Q 5 (?); 12. Kt to Q 2, B takes R; 13. Q takes B, P to K B 3; 14. P to B 4, and should win. The alternative Knight's move—viz., 9. ... Q Kt to K 2, is also inferior, because of 10. P to K 5, Kt to R 3 (!); 11. Kt to B 3, Castles; 12. Kt to K 4, with a good attack.

10.B to Kt 210.Kt to K 2 (!)

One of the chief points of the Evans Gambit is that Black's Q Kt is driven to Q R 4, and has to remain there for some time inactive, so that Black is, for the time being, practically a piece minus for the defence. White must, therefore prevent as long as possible this Knight from coming into play. It will be seen that Black could not have played 10. ... Kt takes B, because in such case 11. B takes K Kt P, winning the exchange.

11.B to Q 3...

If White had here played 11. B takes P instead of the text move, the continuation might probably have been—

11.B takes P11.R to K Kt sq.
12.B to B 612.Kt takes B
13.Q to R 4: ch.13.Q to Q 2
14.Q takes Kt14.R takes P: ch.
15.K takes R15.Q to Kt 5: ch.
16.K to R sq.16.Q takes Kt: ch.
17.K to Kt sq.17.B to R 6, and wins.

11.B takes P11.R to K Kt sq.
12.B to B 612.Kt takes B
13.Q to R 4: ch.13.Q to Q 2
14.Q takes Kt14.R takes P: ch.
15.K takes R15.Q to Kt 5: ch.
16.K to R sq.16.Q takes Kt: ch.
17.K to Kt sq.17.B to R 6, and wins.
...11.Castles
12.Kt to B 312.Kt to Kt 3
13.Kt to K 213.P to Q B 4

White concentrates his forces for an attack on the King's side, whilst Black, being stronger on the Queen's side, must try to create a diversion on that side.

14.Q to Q 214.P to B 3
15.K to R sq....