2. 2nd line-mover (usually a B) attacks 2nd target with weight 1, defended once.

3. Move your Q onto the intersection of #1 and #2. This reduces to a simple fork, as if the R+B + both defenders were not present.

click for larger view

As the Q must generally be behind the R and in front of the B, this further necessitates:

4. an R lift

5. a B thing (develop + retreat) or fianchetto