You're on the right track. But what I've found, when giving people the opportunity to select an item, and then giving them the entire screen to move it, they never take advantange of that fact, and will just move their finger over the item, even if it's completely covered up by their finger. Perhaps an alternate solution would be to just have a zone around the item, that is big enough to grab hold of. That way you leave the rest of the screen open for other actions. Also, you need to remember that you may have female players, with long fingernails. They tend to use the device with the flat part of their thumb or finger, which is massive compared to a finger tip. And since the device chooses what part of the finger is the contact point, you need to make sure you're covering a large enough area to catch what is considered the actual touch location.
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