Also though they are rare, there are some nasty beginnings too, like this one: https://imgur.com/a/tjHg5if
I might be overlooking something tho.
I might be overlooking something tho.
The 1s on the little concave bit mean you know where the nearest 2's second flag should go, even though you don't know yet where the 1 is. Then that gives you some to clear.
The 1 SouthEast of the bottom 2 touches two tiles, and the 1 immediately West touches a superset of those two. The difference between the larger and smaller set must be clear. And you can go further off of that.