Can you input a problem position in SmartGo Kifu and then have it play the other side against you when you try to solve it ? Can you do this with EasyGo or Champion Go HD ?

No, you can't with Smartgo Kifu. You are limited to the existing problems library (still pretty large).
Yes, it can be done with Easygo : the program would play the opposite move and select play at random if there are variations for his side. It's the app to have to create problems on iPad.
Champion Go HD does not provide any problem library at all.

Maybe MLC means the app has the AI to solve the problem. EasyGo can't do that, you have to input the solution manually.

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-xiangz, the author of EasyGo for iOS

yes that's what I meant ... not solve the problem just play the other side when we try to solve it ... maybe it doesn't exist yet ?

Igowin HD can "pick up" from an existing game position loaded from sgf and play as black or white against you, but not in problem setting but just play to win

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Geek of all trades, master of none: the motto for my blog mostlymaths.net