Hi,
thanks for your answers. You both made some good points.
Position 1:
White´s threat is to make a strong inner point or blocking point within the next roll. If black plays 24/18 13/9 or 24/14 white can only hit and make an inner point with 11 and 33. If withe hits on the 18 or 14 point, Black may hit back and gain many pips. But running to the 14 point looks better to me. Like peachpie said, it feels so wrong leaving it at the 18 point in front of four builders aiming at it!
Playing 8/2 6/2 is bad because Black basically gives up the 8 point and will have a hard time the next rolls if White makes his bar point or 5 point.
Position 2:
I did not consider 24/18 13/9 to be an option. Ok, it duplicates sixes but i thought it was too risky. So i had to decide between the even worse 13/3* and 24/14. For some reason thought i have to hit there to take the initiative. After thinking about it for a while and counting some shots, i think it is clear that hitting here is wrong. White will have 19 return shots and if White misses there are only 3 builders at the 6 point... It would be interesting to rollout this position with additional builders on the 7 and / or the 8 point.
Position 3:
The error is small, thats right, but i think the reasoning behind the best move is slightly similar to position 1. I think splitting here is not neccessary because White has not made a strong blocking or inner point or has a ton of builders ready to do so. 24/18 and 24/23 13/8 are the only reasonable plays, so this position may not be a good "reference position" for demonstrating the "slotting the enemies bar point, because it is distracting him from making strong inner points" concept
If such a concept exists - I think it does, because to me it makes sense.
I think i have to play around with the positions a bit to get a better understanding of it.
What do you think?
Thanks a lot for your input!