Quick answer
Fortress in Queen Endings is an endgame technique: queen against rook coordination. Work from the first evidence position for Fortress in Queen Endings, and begin by testing Rg7.
Begin from Rg7 in 6rk/8/8/5K2/3Q4/8/8/8 b - - 3 2. Count the material, king routes, promotion squares and reserve tempi before applying a theoretical rule. The evidence answer is: Fortress in Queen Endings: use checks and king safety to separate the rook from the defending king. Candidate line: Rg7.
In the Fortress in Queen Endings example, notice: side Black; pieces Black rook g8, Black king h8, White king f5, White queen d4; legal first moves Rg7, Kh7. Anchor your reading to the FEN above; the inventory is illustrative, not a portable law of chess.
Material and result question
The first evidence board tests queen against rook coordination; the second board tests queen against rook coordination. Use direct FEN setup to reconstruct A and direct FEN setup to reconstruct B when the evidence includes move text. Shared language is catalogued on the Chess Wiki and the Endgames hub. Then compare Material Values with Fortress In Chess Endgames, Stalemate In Endgames, Theoretical Draws In Chess around an outside passer used as a decoy.
The two inventories make the distinction concrete. A contains side Black; pieces Black rook g8, Black king h8, White king f5, White queen d4; legal first moves Rg7, Kh7; B contains side Black; pieces Black king h8, White queen e6, White king h6, Black rook e1; legal first moves Re2, Re3, Re4, Re5, Rxe6+, Rf1, Rg1, Rh1+. Compare the side to move before comparing the labels in the context of the defender's only active counterplay.
Topic dossier for this page and board pair r1:6rk | r2:8 | r3:8 | r4:5K2 | r5:3Q4 | r6:8 | r7:8 | r8:8 / r1:7k | r2:8 | r3:4Q2K | r4:8 | r5:8 | r6:8 | r7:8 | r8:4r3: start with an outside passer used as a decoy; then test the defender's only active counterplay; keep the pawn's promotion square separate from the defender's fortress setup; use the side-to-move tempo as the transfer check; and reserve a reserve pawn move for the exception.
Conversion or defense plan
On the first board, calculate Rg7 after Rg7 and write down the opponent's best reply around an outside passer used as a decoy. On the second board, calculate Re2 after Re2 and check the defender's only active counterplay. Separate the practical conversion question from the result question; side to move and one checking distance can change the conclusion. In this case the useful condition is a reserve pawn move.
Key claim: Fortress in Queen Endings is illustrated here by queen against rook coordination; the first concrete test is Rg7. The board anchor is 6rk/8/8/5K2/3Q4/8/8/8; the example is intentionally narrower than the topic label and should not be generalised without checking the surrounding position..
Practical boundary: To answer “What exact king, pawn, and move-order conditions decide fortress in queen endings, and how should each side play them?”, compare the recorded setup with Re2 and the opponent's reply. The decision is useful only when the stated condition survives that concrete test on board 7k/8/4Q2K/8/8/8/8/4r3. The evidence records No tablebase outcome is asserted by this generated record; verify the exact FEN before publication and the second board signature r1:7k | r2:8 | r3:4Q2K | r4:8 | r5:8 | r6:8 | r7:8 | r8:4r3. The false-positive test is whether the pawn's promotion square appears without the defender's fortress setup, so the conclusion is useful only when the stated condition survives that concrete test.
Evidence positions
example-1: queen against rook coordination
Show answer
Fortress in Queen Endings: use checks and king safety to separate the rook from the defending king. Candidate line: Rg7.
Why this position is here: Fortress in Queen Endings is represented by queen against rook coordination. This is a direct FEN setup with board anchor 6rk/8/8/5K2/3Q4/8/8/8; no opening history is inferred from the diagram.
FEN: 6rk/8/8/5K2/3Q4/8/8/8 b - - 3 2
Question: What is the first concrete decision in this fortress in queen endings position?
Answer cue: Fortress in Queen Endings: use checks and king safety to separate the rook from the defending king. Candidate line: Rg7. The first candidate to test is Rg7. Replay Rg7 on board anchor 6rk/8/8/5K2/3Q4/8/8/8 and write down what changes after it.
Evidence boundary: No tablebase outcome is asserted by this generated record; verify the exact FEN before publication.
example-2: queen against rook coordination
Show answer
Fortress in Queen Endings: use checks and king safety to separate the rook from the defending king. Candidate line: Re2.
Why this position is here: Fortress in Queen Endings is represented by queen against rook coordination. This is a direct FEN setup with board anchor 7k/8/4Q2K/8/8/8/8/4r3; no opening history is inferred from the diagram.
FEN: 7k/8/4Q2K/8/8/8/8/4r3 b - - 5 3
Question: What is the first concrete decision in this fortress in queen endings position?
Answer cue: Fortress in Queen Endings: use checks and king safety to separate the rook from the defending king. Candidate line: Re2. The first candidate to test is Re2. Replay Re2 on board anchor 7k/8/4Q2K/8/8/8/8/4r3 and write down what changes after it.
Evidence boundary: No tablebase outcome is asserted by this generated record; verify the exact FEN before publication.
example-3: queen against rook coordination
Show answer
Fortress in Queen Endings: use checks and king safety to separate the rook from the defending king. Candidate line: Rg7.
Why this position is here: Fortress in Queen Endings is represented by queen against rook coordination. This is a direct FEN setup with board anchor 6rk/8/8/3Q3K/8/8/8/8; no opening history is inferred from the diagram.
FEN: 6rk/8/8/3Q3K/8/8/8/8 b - - 3 2
Question: What is the first concrete decision in this fortress in queen endings position?
Answer cue: Fortress in Queen Endings: use checks and king safety to separate the rook from the defending king. Candidate line: Rg7. The first candidate to test is Rg7. Replay Rg7 on board anchor 6rk/8/8/3Q3K/8/8/8/8 and write down what changes after it.
Evidence boundary: No tablebase outcome is asserted by this generated record; verify the exact FEN before publication.
Reading the line
Read the first example (id example-1) as a complete record: continuation Rg7, source tablebase. This is a direct FEN setup with board anchor 6rk/8/8/5K2/3Q4/8/8/8; no opening history is inferred from the diagram. If A does not expose queen against rook coordination, correct the evidence before relying on the prose.
Read the second example (id example-2) separately: continuation Re2, source tablebase. Its feature is queen against rook coordination; inventory side Black; pieces Black king h8, White queen e6, White king h6, Black rook e1; legal first moves Re2, Re3, Re4, Re5, Rxe6+, Rf1, Rg1, Rh1+. Compare what changes between Rg7 and Re2.
Boundary cases
The main mistake to avoid with Fortress in Queen Endings is applying a remembered endgame rule while ignoring side to move, king placement or an unverified result. In A, the missing condition must be located in r1:6rk | r2:8 | r3:8 | r4:5K2 | r5:3Q4 | r6:8 | r7:8 | r8:8 after Rg7; in B, test it against r1:7k | r2:8 | r3:4Q2K | r4:8 | r5:8 | r6:8 | r7:8 | r8:4r3 after Re2.
For Fortress in Queen Endings, the first board's evidence boundary (after Rg7) is No tablebase outcome is asserted by this generated record; verify the exact FEN before publication. The second board's evidence boundary for Fortress in Queen Endings is No tablebase outcome is asserted by this generated record; verify the exact FEN before publication. If a trusted source or careful calculation changes the conclusion around the side-to-move tempo, update both the evidence record and this article.
Practice from a real game
play the position for both sides, record the critical tempo, and verify the exact FEN against the cited tablebase before publication. Start with A's side to move and r1:6rk | r2:8 | r3:8 | r4:5K2 | r5:3Q4 | r6:8 | r7:8 | r8:8; record two candidates, the reply to Rg7 and the correction. Repeat with B's side to move and r1:7k | r2:8 | r3:4Q2K | r4:8 | r5:8 | r6:8 | r7:8 | r8:4r3; the changed board tests transfer rather than diagram memory.
After the drill, compare your notes with Fortress In Chess Endgames, Stalemate In Endgames, Theoretical Draws In Chess through the defender's fortress setup. Keep A's rejected alternative beside B's chosen line Re2; this shows whether the conclusion survived a new board signature.
Sources and scope
Sources for Fortress in Queen Endings: Syzygy tablebase verification reference, 1chess.online editorial scope. Source ids are tablebase, original-analysis. Primary evidence hook: tablebase. Comparisons and practice notes are editorial. Evidence revision: 2026-08-remediation-r2.
Scope note for board pair r1:6rk | r2:8 | r3:8 | r4:5K2 | r5:3Q4 | r6:8 | r7:8 | r8:8 / r1:7k | r2:8 | r3:4Q2K | r4:8 | r5:8 | r6:8 | r7:8 | r8:4r3: this page does not claim that Rg7 is an engine principal variation, that an exact endgame result is verified when the evidence says it is not, or that a tool output replaces human calculation. The conclusion is limited to the recorded boundary and the exception the pawn's promotion square.