| ... | 16. | K to B sq. |
Black cannot play 16. Kt to K 3, because he would thereby leave his K P en prise; he cannot castle, because then his K R P would be en prise; and if he were to return with the Kt to B 3, he would have lost a move. Therefore he has nothing better than to move his King into safety to B sq., and then to Kt 2.
| 17. | Q to Q 2 (?) | 17. | K to Kt 2 |
| 18. | P to K R 3 | ... |
To prevent Black from playing 18. ... B takes B; Q takes B, Kt to Kt 5, attacking the Queen.
| ... | 18. | Kt to B 3 | |
| 19. | Kt to R 4 | 19. | Q R to Q sq. |
Occupying the "open file" and defending the Bishop, so as to free his K Kt, which was before fixed, as it had to defend the Bishop.
| 20. | B takes B | 20. | R P takes B |
It is, in the majority of these cases, better to take with the R P, because it gives an additional "open file" for the entry of the Rook.