No. You made a stroke to a ball you thought was your ball, and therefore you did not incur any penalty.
Yes you have made a stroke to an unplayable ball and thus incur a one stroke penalty, and the stroke counts.
Yes, you have made a stroke to a wrong ball and thus incur two penalty strokes (match play: Lost hole) (the stroke does not count).
No.
Yes, one penalty stroke.
Yes, two penalty strokes (match play: Lost hole).
You.
Your opponent (all balls must be on the putting green, before anyone begins putting).
Yes, it is perfectly OK.
No, but there is no penalty.
No, and he/she incurs a one stroke penalty.
One penalty stroke and the stroke is cancelled.
Two penalty strokes and the stroke is cancelled.
Two penalty strokes and the ball must be played as it lies (the stroke counts).
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