Embedded Ball Rule 16.3a
The rule changed at the start of the year.
Free relief is now allowed if your ball is embedded in the
general area. Your ball is only embedded if it is in its own pitch mark
made as a result of your previous stroke and part of your ball is below the
level of the ground.
NOTE 1: Reference Point for your drop is the point right behind where the ball is embedded. The ball must be dropped within a one-club length relief area and must remain within the relief area.
NOTE 2: Relief is not allowed if interference by anything other than your ball being embedded makes your stroke clearly unreasonable (eg when your ball is embedded under a bush that prevents you from making a stroke). Relief is also not allowed if it is embedded in sand not on the fairway
NOTE 3: If your ball is embedded on the putting green, you may mark your ball, repair the damage and replace your ball on its original spot.