Yes but as the most harmful form of tactical voting I consider giving up one's preferred candidate because of despair that he won't get in. This reasoning may be well-founded so in fact you may feel you have no choice and this makes candidates which are not strong even weaker. STV solves this.

OTOH If you voluntarily vote for other candidate because your favorite one feels strong enough then you are rightfully punished for greediness and free riding when this backfires.

Or is there other sort of tactical voting here?