good idea
Game Explorer link to play a desired position against computer

I am recommending that Chess.com create a way for users to have the option in the Game Explorer, once they have found a position they find interesting, to be able to play it against the computer.
Meantime you can try this way if you want.
http://www.chess.com/explorer/
Play out the moves till you find the position you need to test.
http://www.chess.com/games/results?f=23282461
View the result of your position from Master Game list. Download PGN so can try on Engine.

I am recommending that Chess.com create a way for users to have the option in the Game Explorer, once they have found a position they find interesting, to be able to play it against the computer.
Meantime you can try this way if you want.
http://www.chess.com/explorer/
Play out the moves till you find the position you need to test.
http://www.chess.com/games/results?f=23282461
View the result of your position from Master Game list. Download PGN so can try on Engine.
I appreciate the suggestion. I don't really want to use the games masters have played to a conclusion, as much I would like to simply play from a position against the computer. I wish the Game Explorer had a PGN file available for the positions arrived at, instead of just a FEN string. Maybe I should suggest that also.
I am recommending that Chess.com create a way for users to have the option in the Game Explorer, once they have found a position they find interesting, to be able to play it against the computer.