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I think the main purpose of the dark check is to switch betting positions. Checking in the dark makes the guy with the better position act first. It can be effective if used correctly.

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This is exactly why it is a powerful tool when used in the correct situations. Most internet players cannot grasp how useful it is making your opponent react to the flop first and picking up that information before you must make a decision on what to do AND the flip side is that your opponent does not get this information from you.

In the right situations this is much more valuable than the potential free card for your opponent.

Being that the majority of my play is live I am a huge fan of this move when used correctly. Some of my craftier opponents whom I have played against multiple times have even thrown in the 'dark check behind' when I dark check.