Triangulation #2: A nice, slightly more difficult example
Triangulation is a tactic used in chess to put one's opponent in zugzwang. That is, it gets to the same position with the other player to move, when it is a disadvantage for that player to move, e.g. he has to give up a blockade and let the other player penetrate his position. Triangulation is also called losing a tempo or losing a move. (Triangulation (chess), wikipedia)
Let us have a short look to the next diagram.
It should be obvious that with Black to move it is an easy win for White.
Now let us look to the same position, but now with White to move: