This is a reference, not a walkthrough. If you want to watch one board fall from the first X to the last crown, our beginner solving guide does exactly that, on a real 8×8. This page does something different. It names each technique, shows you the precise moment it fires, and tells you what it eliminates. Then, when a board goes quiet on you, you can say which move the position is asking for instead of staring at it.

One thing before the list. Search "advanced Queens strategy" and you'll mostly find the same three ideas recycled under different names. The honest count of genuinely distinct moves is five — or four tiers, the way our solver groups them, because two of the five are mirror images and share a tier. We can say that with unusual confidence because our generator enforces it: every board on our Queens page has to be solved, start to finish, by a five-technique logic solver before it's allowed near the daily schedule. A board that needs anything beyond these five gets thrown away. So this list isn't our opinion about what matters. It's the complete toolkit, by construction.

The Five Moves, in Escalation Order

Our solver works in tiers, always trying the cheapest move first and only escalating when nothing simpler applies. The tiers also drive our difficulty ratings. A board only rates Easy if it falls to tiers 1 and 2 alone, and lightly at that; a long tier-2 grind gets bumped to Medium. A board rates Hard the moment a single step needs tier 4. Nobody eyeballs these ratings. They're computed from the solver's own step list.

  • Tier 1 — forced cells (singles).
  • Tier 2 — a region confined to one row or column, and its mirror, a row or column confined to one region.
  • Tier 3 — pigeonhole counting across two or three regions.
  • Tier 4 — the dead-end test, which is where the adjacency squeeze lives.

Forced Cells: The Singles

A forced cell is a row, column, or color region with exactly one open square left. The queen goes there. No judgment involved.

The moment it fires: on a 7×7 board, your eliminations have crossed off every square of the green region except row 5, column 3. Place the queen. Unless you've switched auto-X off in the play settings, the board immediately crosses off the rest of row 5, the rest of column 3, any leftover green squares, and all eight neighbors. That cascade is the whole rhythm of Queens: one placement, a wave of Xs, and usually another single somewhere in the wave.

Singles are trivial to execute and easy to miss. When you're stuck, the first scan is always the same: does any row, column, or color have one square left? The answer is yes more often than feels reasonable, and the missed single is usually hiding in a column.

Region Confined to a Row or Column

If all of a region's remaining squares sit in a single row, that region's queen must land in that row, so no other region can have it. Cross off every other open square in the row, even though you don't yet know which square the queen takes. Same logic for columns.

The moment it fires: on an 8×8, earlier Xs have reduced the orange region to three squares, all in row 2: columns 4, 5, and 6. You can't place anything yet. But row 2's queen is now certainly orange, so the open squares at row 2, columns 1 through 3 and columns 7 and 8 all get crossed off, whatever colors they belong to. Three candidates in, five eliminations out, and one of those eliminations is usually what shrinks the next region into confinement.

If you also play Star Battle, you already own this move. It's the same region confinement we teach there, and we use the same name on purpose. The only difference is that Star Battle's two-star boards make the bookkeeping heavier. Queens is region confinement with the training weights off.

The Reverse: A Line Owned by One Color

Now flip it. If every remaining square in a row or column belongs to the same region, that line's queen is that region's queen — so the region's squares outside the line are dead.

The moment it fires: column 7 is down to two open squares, at rows 2 and 3, and both are blue. Column 7 must get a queen, and only blue can supply it. Blue only has one queen to give, so blue's other open squares, say rows 2 and 3 of column 6, get crossed off.

You'll spot the forward direction far more readily than this one, because your eyes naturally track regions and rarely audit what's left of a column. When a board stalls, run the reverse scan deliberately: for each row and column, ask whether everything still open in it is one color. This is the technique most "advanced strategy" articles skip entirely, which is one reason we don't think much of the genre.

Pigeonhole Counting: When Regions Pair Up

Sometimes no single region is confined, but two regions together are. If two regions' remaining squares span only two rows between them, those two rows' queens must come from those two regions — two queens, two rows, no room for anyone else. Every other color's square in those rows gets crossed off. The same holds for three regions spanning exactly three rows, and for columns.

The moment it fires: red's remaining squares are row 6 column 2, row 7 column 2, and row 7 column 3. Teal's are row 6 columns 5 and 6, and row 7 column 6. Neither region is confined to a single row; both straddle rows 6 and 7. But together they span only those two rows, so rows 6 and 7 belong to red and teal between them. The green squares sitting at rows 6 and 7 of column 8? Crossed off, and green just got smaller somewhere far from the action.

This is the counting move, and needing it even once disqualifies a board from rating Easy on our site. One structural reassurance: the solver only ever looks for pairs and triples, so on our boards you'll never need to juggle four regions at once. If you think you need a quadruple, you've missed something cheaper.

The Adjacency Squeeze

The no-touch rule mostly acts as a tax on placements. The squeeze is the one moment it becomes a weapon. When a region is reduced to a tight cluster, any square adjacent to all of that cluster is impossible — a queen there would suffocate the region entirely.

The moment it fires: the tan region is down to a domino at row 4, columns 4 and 5. Confinement already cleared the rest of row 4; that part is old news. The squeeze adds four eliminations confinement can't see: row 3 columns 4 and 5, and row 5 columns 4 and 5. Each of those squares touches both tan cells (one orthogonally, one diagonally), so a queen on any of them leaves tan with nowhere to go. Cross off all four.

Formally, this is one case of a more general tier-4 move: try a queen on a square, apply only its direct exclusions, and if any row, column, or region is left empty, the square was never legal. Our step-by-step solutions narrate it that way: "leads to a dead end, so that square can be crossed off." That's not guessing. You never commit to the placement; you test it, watch it fail, and bank the elimination. But it is the expensive move, which is exactly why any board that needs it even once rates Hard on our site.

Naming Your Deadlock

The promise of this page is that a stall turns into a diagnosis. One of the five moves is waiting on the board; your job is to work out which. Run them in tier order: any line or color with one square left? Any region flat enough to be pinned to a line? Any line left in one color? Any pair of regions sharing two lines? Only then hunt for a squeeze, starting with whichever region has the tightest cluster of survivors. On our boards, one of those five questions always has a yes. The generator guarantees it.

Two ways to drill this. Every daily board has a step-by-step solution narrated in exactly the terms above, so when you finish (or give up), you can check which technique you missed and where. And anyone can work back through the Queens archive; the Hard boards there are a reliable supply of tier-4 moments, since that's what made them Hard in the first place. Pick one technique, hunt it across five old boards, and it'll start announcing itself on new ones.