There are several great analysis apps for Android. But they have the engine built in. I recommend using the online analysis boards that Chess.com provides.
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So, has anyone seen any nifty web interface solution where you can analyse your games, ie. play forward a number of moves from a position, come back, then try a different line etc. The online "chessboard" solutions I have seen just drop and forget the previous line as soon as you start exploring a new one, which is useless for analysis. And some include an analysis engine which cannot be turned of, but I only want to analyse, not cheat.