Sounds like a nice feature if it existed, but I haven't seen it at this site. The games in an opening book or similar game database either has a FEN stored for every half move or some similar attributes since you will get a list of all games in the book with the same position. If the games in your archive are stored with the same information it should be easy to implement a search function where you can set up a position. Don't know how much extra server space this info would take in addition to a pure pgn-file though.
downloading games
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Is it possible to download my games that have reached a specific position?
I know I can download my games in general from the archive but i cant search a specific position there (or can I?) and I know I can use the explorer to find statistics about a position but I dont see a way to download from there.
One other thing is when searching for games with an opening it seems necessary to name a specific variation and even a subvariation of an opening. It doesnt seem possible to find your games that for example Sicilian Defense was played.
I like to play the Sicilian Alapin and when i search these games I need to put the specific subvariation of the Alapin. Problem is that most of the time i play an out of the book subvariation so it is not possible to search for it.
Any suggestions?