...4.Kt to B 3
5.P to Q 35.P to Q 3

This is the quietest form of the Lopez and may be adopted with safety.

6.Kt to B 36.B to Q 2
7.Castles7.B to K 2
8.P to Q 48.P to Q Kt 4
9.P takes P9.Q Kt takes P
10.Kt takes Kt10.P takes Kt
11.B to Kt 311.Castles
12.B to Kt 512.P to Q R 4

A good move, as it anticipates White's advance of the Q R P, and thus renders the Queen's side safe.

13.B takes Kt13.B takes B
14.P to Q R 414.P to Kt 5

It would be bad to play here 14. ... P takes P,

because it not only would give White an open Rook's file, but also isolate Black's R P and Q B P, a weakness from which he could not recover against the best play.

Neither side has so far gained any material advantage.

Second Variation.
Repeat the first five moves on either side.