I was leeward boat when we hit, hence rule 11 applies, not rule 12.
Overlap is not measured from the bow, but from any part of the boat, however here the boat is limited to hull and mast.
Inside boat means the boat on the port side of the other for a mark to be rounded to port.
Where you are relative to the mark has nothing to do with "inside boat".
In this case:
Overlapped = Leeward = Inside boat
Contact means no mark-room given.
No contact also means no mark-room is given, if the boats would have hit if the inside boat sailed within the mark-room she was entitled.
I will add a few screens from Zhik's stern to point out start and end of overlap.
Click on image to see full height, to include time stamp
4:17.50 Overlap begins (mast)
4:19.80 Overlap also with hull
![2020-04-01 15_05_03-VskAC32.png](./download/file.php?id=179&sid=e8b095314e3a10849b4baa4db69d572a)
- 2020-04-01 15_05_03-VskAC32.png (244.97 KiB) Viewed 4136 times
4:21.00 I stop rotation (even bow is overlapped)
![2020-04-01 15_06_22-VskAC32.png](./download/file.php?id=180&sid=e8b095314e3a10849b4baa4db69d572a)
- 2020-04-01 15_06_22-VskAC32.png (199.59 KiB) Viewed 4136 times
4:21.31 Overlap hull ends (but continues with mast)
![2020-04-01 15_07_03-VskAC32.png](./download/file.php?id=181&sid=e8b095314e3a10849b4baa4db69d572a)
- 2020-04-01 15_07_03-VskAC32.png (236.13 KiB) Viewed 4136 times
I hope this helps.
For the record, "contact" in vsk happened even when overlapped with hull.
Harald