Indirect openings of Renju 4-6

In all diagrams the first 4 moves always are made. The other moves are alternatives for the 5th move. Theoretically the alternatives gives the following situations:

5,7          = Black has a sure win
9,11         = Black has a (little) advantage
13,15,17     = The chances to win is  about fifty-fifty
19           = White has a (litle) advantage
21,23,25,27  = White has a sure win