Especially when course conditions are soft or you’re playing a day or two after some heavy rain, a ball can come to rest in its own pitch-mark, making it very difficult for a player to make a stroke at the ball. This was not the intent of the game of golf and therefore, the Rules allow free relief for a ball in such a situation.
The diagram below helps to show what the Rules of Golf mean by an embedded ball:
The key is that part of the ball needs to be below the level of the ground and the ball needs to be in its own pitch-mark, not some other pitch-mark. A ball that is nestled in thick rough or pine straw (third picture) is not embedded and is not entitled to free relief.
Free relief is allowed if the ball is embedded anywhere in the general area with two exceptions:
The relief procedure for an embedded ball is different from the nearest point of complete relief Rules and does not use a nearest point of complete relief as the reference point. To take relief for an embedded ball: