Example 17.—Suppose we begin:
1. P - K 4P - K 4
2. Kt - K B 3
This is both an attacking and a developing move. Black can now either reply with the identical move or play
2. ........ Kt - Q B 3
This developing move at the same time defends the King's Pawn.
3. Kt - B 3 Kt - B 3
These moves are of a purely developing nature.
4. B - Kt 5
It is generally advisable not to bring this Bishop out until one Knight is out, preferably the King's Knight. The Bishop could also have been played to B 4, but it is advisable whenever possible to combine development and attack.
4. ........ B - Kt 5
Black replies in the same manner, threatening a possible exchange of Bishop for Knight with Kt × P to follow.
5. O - O
an indirect way of preventing 5...B × Kt, which more experience or study will show to be bad. At the same time the Rook is brought into action in the centre, a very important point.
