The 1-2-2-1 pattern
Safe, mine, mine, safe. The longer cousin of 1-2-1.
The longer cousin of 1-2-1, running on the same idea. The two 2s in the middle each want both of the cells only they can see, which pins the mines to the middle and leaves both ends safe.
Drill 1 of 4
Flag every mine and open every safe cell you can prove.