Is there any website that allows you to check if a position has been played before? I want to analyse a game and I want to check if it has been reached before. Any suggestions?
Look up "Chessbase Live Database" on Google and click on the first result. You should be taken to this url:
You just enter moves and click the magnifying glass button, causing a list of games played to show up.
Look up "365Chess.com", which is a chess games database online. Here is the link for searching a position:
You can enter moves, import pgn, or fen positions.