Mazzeltov3 #1I wonder if theres some computer algorithm that selects combinations from games, or maybe you have to nominate your own game?
DoTheMathedited #2It's done automatically. Here are some old blog posts about it:lichess.org/blog/U4sjakQAAEAAhH9d/how-training-puzzles-are-generated (2014)lichess.org/blog/WDY6cCEAALYi5Xg2/puzzles-update (2016)