HOLING OUT: 803.13 B
Disc Entrapment Devices: In order to hole out, the thrower must release the disc
and it must come to rest supported by the chains and/or the inner cylinder (bottom and
inside wall) of the tray. It may be additionally supported by the pole. A disc observed by two or more players of the group or an official to have entered the target below the top of the tray or above the bottom of the chain support is not holed out.
What does it mean? Wedges don't count and the ones that slide through the tray won't count either.