For years seki’s just happened to me. I thought I had a healthy living group and then my opponent put some stones in it and we both couldn’t play any move over there. I lost quite a few games because of the sekification of one of my groups. A seki usually means a reduction of the conquered territory of at least 10 points (but usually much more).
So the question is - when you decide to use sekification as a strategy / tactic - how to work up to a sekifiable group (preparing the situation) and how to sekify the group (creating a mutual life)?
Kosh offered a tip in the same thread about one of my sekis
I’ve been trying to pay attention to the outside liberties ever since, but usually to avoid being invaded. I had not seen the idea formulated this way before, the timing of after endgame sealing territory was new to me. I should watch for chances to sekify my opponent as well