Techniques, records and stories from the daily boards.
Three adjacent numbers reading 1-2-1 along the edge of the opened area settle the position of two mines with zero risk. Together with 1-2-2 and the mine counter, that is the whole toolkit.
Naked single, hidden single, naked pair and locked candidates. Nothing beyond that is needed to close almost any hard board — and none of it involves guessing.
The honest answer: you get better at what you practise, and almost only at that. It is still a good reason to play — just a different one from what brain training apps advertise.
