I currently have a Google Doc with some notes on things to look at again, like: "Go Seigen v. Inoue Ichiro - Move 28." The diagrams I can make are pretty rudimentary. L19 and Sensei's have great diagrams but my ideas are not put together and I would not want to clutter the "new" sections. Once nice thing about Google Docs is that once the diagrams are in there it's easy to browse from my phone.
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My first instinct when scared of my stones being trapped is to jump. But sometimes I see these extensions in pro games. I saw it here and also in one of the Alpha Go game commentaries. I would like to remember to consider such a move as well. In this case, it seems better than jumping as it put pressure on the 2 black stones.
