The fine art of lawn mowing

 If you don't see the endpoint pattern, there are many ways to go astray. Look for instance at this simple problem:

White to move

8/7p/3p2pQ/3P4/q1b3k1/6R1/r3PP2/6K1 b - - 0 0

You can find the [ solution here ]

Have especially a look at the comments and the 40 mistakes that people have found to make.

While if you see the lawn mower pattern and the wall created by the pawns, the solution is immediately clear. Which tells us where the work lies: absorb the simple endpoint patterns.