Update: If one of the intersecting lines will be a 4-gem line after the move, then both the 4-gem line and the 3-gem line will give the same number of points (I witnessed 20 points for each line on level 2).
Update: If one of the intersecting lines will be a 4-gem line after the move, then both the 4-gem line and the 3-gem line will give the same number of points (I witnessed 20 points for each line on level 2).