For “CHECKER DESELECT” (Blender 2.8): In “EDGE SELECT” mode mark an “EDGE RING” with [ALT + CTRL + LEFT_MOUSE_BUTTON], call “CHECKER DESELECT” with “DESELECTED” 3, “SELECTED” 1 and “OFFSET” -1. Now, every fourth edge vertical to the selection direction is selected. You can now, if necessary, extend your selection beyond limiting “EDGE LOOPS” by Menu “SELECT” -> “SELECT LOOPS” -> “EDGE LOOPS”. The “OFFSET” from the starting point (that is the active edge) is the key. It has to be “-1” so that the active edge stays selected. From this you simply specify how many neighbouring edges after this have to be “DESELECTED” and how many neighbouring edges after that again have to be “SELECTED”
The settings for Blender 2.79 and older would be:
“Nth SELECTION”: 4
“SKIP”: 1
“OFFSET”: 0
I find the new pattern definition in Blender 2.8 clearer: It starts with how many elements including the active element as starting point (if “OFFSET” is set to “0”) are deselected and how many after this are selected.
