If you feel like you're guessing constantly, you're probably not — you're missing patterns that make those cells deducible. Guessing feels necessary when you don't know the patterns. Once you know them, most positions that looked like guesses turn out to have a definite answer.
Two adjacent 1s along a cleared edge, with a row of unknown cells on the open side. The unknown cell shared by both 1s is always safe; the outer cells are constrained. Most players guess here instead of deducing.
Three numbers along an edge. The middle cell is always a mine; the outer two are always safe. Full deduction →
Four numbers along an edge. The two middle unknowns are mines; the outer two are safe. Full deduction →
If a cell shows 1 and has only one remaining unknown neighbor, that neighbor is definitely the mine. Flag it. This is so obvious it gets overlooked — players sometimes don't notice that a 1 has had all but one neighbor cleared.
Some positions have no safe deduction. Typically:
Unavoidable guesses exist in roughly 20–30% of intermediate games. But if you feel like you're guessing every few clicks, the issue is pattern recognition, not bad luck.
Players who flag mines as they find them often create a visual mess that makes patterns harder to see. If you're playing quickly and flagging aggressively, slow down. Look at each numbered cell after flagging and check: does it now have all its mines accounted for? If so, every other unknown neighbor is safe to click.
After flagging a mine, always sweep around the flagged cell — check every number neighboring it to see if the flag satisfies its count. This sweep often reveals several safe cells in a chain and reduces the isolated unknowns that produce 50/50s.