Quick answer
Key Squares in Pawn Endgames is an endgame technique: promotion race and tempo. Work from the first evidence position for Key Squares in Pawn Endgames, and begin by testing Kf2.
Begin from Kf2 in 8/8/8/3p4/8/4P3/3K4/6k1 b - - 3 3. Count the material, king routes, promotion squares and reserve tempi before applying a theoretical rule. The evidence answer is: Key Squares in Pawn Endgames: calculate both promotion paths and include checks before assuming the faster pawn wins. Candidate line: Kf2.
In the Key Squares in Pawn Endgames example, notice: side Black; pieces Black pawn d5, White pawn e3, White king d2, Black king g1; legal first moves d4, Kf2, Kg2, Kh2, Kh1, Kf1. The candidates above are taken from this FEN snapshot and should be re-checked on any new board.
Material and result question
The first evidence board tests promotion race and tempo; the second board tests promotion race and tempo. Where the evidence stores a move string, A is built with direct FEN setup and B with direct FEN setup. Shared language is catalogued on the Chess Wiki and the Endgames hub. Then compare Material Values with Rule Of The Square, Corresponding Squares, Outside Passed Pawn around the side-to-move tempo.
The two inventories make the distinction concrete. A contains side Black; pieces Black pawn d5, White pawn e3, White king d2, Black king g1; legal first moves d4, Kf2, Kg2, Kh2, Kh1, Kf1; B contains side White; pieces Black pawn d6, White pawn e3, White king e2, Black king g2; legal first moves e4, Kd3, Ke1, Kd1, Kd2. Compare the side to move before comparing the labels in the context of a reserve pawn move.
Topic dossier for this page and board pair r1:8 | r2:8 | r3:8 | r4:3p4 | r5:8 | r6:4P3 | r7:3K4 | r8:6k1 / r1:8 | r2:8 | r3:3p4 | r4:8 | r5:8 | r6:4P3 | r7:4K1k1 | r8:8: start with the side-to-move tempo; then test a reserve pawn move; keep the active rook before the pawn push separate from the conversion move order; use an outside passer used as a decoy as the transfer check; and reserve the defender's only active counterplay for the exception.
Conversion or defense plan
On the first board, calculate Kf2 after Kf2 and write down the opponent's best reply around the side-to-move tempo. On the second board, calculate e4 after e4 and check a reserve pawn move. 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 the defender's only active counterplay.
Key claim: Key Squares in Pawn Endgames is illustrated here by promotion race and tempo; the first concrete test is Kf2. The board anchor is 8/8/8/3p4/8/4P3/3K4/6k1; 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 key squares in pawn endgames, and how should each side play them?”, compare the recorded setup with e4 and the opponent's reply. The decision is useful only when the stated condition survives that concrete test on board 8/8/3p4/8/8/4P3/4K1k1/8. The evidence records No tablebase outcome is asserted by this generated record; verify the exact FEN before publication and the second board signature r1:8 | r2:8 | r3:3p4 | r4:8 | r5:8 | r6:4P3 | r7:4K1k1 | r8:8. The false-positive test is whether the active rook before the pawn push appears without the conversion move order, so the conclusion is useful only when the stated condition survives that concrete test.
Evidence positions
example-1: promotion race and tempo
Show answer
Key Squares in Pawn Endgames: calculate both promotion paths and include checks before assuming the faster pawn wins. Candidate line: Kf2.
Why this position is here: Key Squares in Pawn Endgames is represented by promotion race and tempo. This is a direct FEN setup with board anchor 8/8/8/3p4/8/4P3/3K4/6k1; no opening history is inferred from the diagram.
FEN: 8/8/8/3p4/8/4P3/3K4/6k1 b - - 3 3
Question: What is the first concrete decision in this key squares in pawn endgames position?
Answer cue: Key Squares in Pawn Endgames: calculate both promotion paths and include checks before assuming the faster pawn wins. Candidate line: Kf2. The first candidate to test is Kf2. Replay Kf2 on board anchor 8/8/8/3p4/8/4P3/3K4/6k1 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: promotion race and tempo
Show answer
Key Squares in Pawn Endgames: calculate both promotion paths and include checks before assuming the faster pawn wins. Candidate line: e4.
Why this position is here: Key Squares in Pawn Endgames is represented by promotion race and tempo. This is a direct FEN setup with board anchor 8/8/3p4/8/8/4P3/4K1k1/8; no opening history is inferred from the diagram.
FEN: 8/8/3p4/8/8/4P3/4K1k1/8 w - - 2 2
Question: What is the first concrete decision in this key squares in pawn endgames position?
Answer cue: Key Squares in Pawn Endgames: calculate both promotion paths and include checks before assuming the faster pawn wins. Candidate line: e4. The first candidate to test is e4. Replay e4 on board anchor 8/8/3p4/8/8/4P3/4K1k1/8 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-3: promotion race and tempo
Show answer
Key Squares in Pawn Endgames: calculate both promotion paths and include checks before assuming the faster pawn wins. Candidate line: d5.
Why this position is here: Key Squares in Pawn Endgames is represented by promotion race and tempo. This is a direct FEN setup with board anchor 8/8/3p4/8/4P3/3K4/8/7k; no opening history is inferred from the diagram.
FEN: 8/8/3p4/8/4P3/3K4/8/7k b - - 4 3
Question: What is the first concrete decision in this key squares in pawn endgames position?
Answer cue: Key Squares in Pawn Endgames: calculate both promotion paths and include checks before assuming the faster pawn wins. Candidate line: d5. The first candidate to test is d5. Replay d5 on board anchor 8/8/3p4/8/4P3/3K4/8/7k 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 Kf2, source tablebase. This is a direct FEN setup with board anchor 8/8/8/3p4/8/4P3/3K4/6k1; no opening history is inferred from the diagram. If A does not expose promotion race and tempo, correct the evidence before relying on the prose.
Read the second example (id example-2) separately: continuation e4, source tablebase. Its feature is promotion race and tempo; inventory side White; pieces Black pawn d6, White pawn e3, White king e2, Black king g2; legal first moves e4, Kd3, Ke1, Kd1, Kd2. Compare what changes between Kf2 and e4.
Boundary cases
The main mistake to avoid with Key Squares in Pawn Endgames 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 r1:8 | r2:8 | r3:8 | r4:3p4 | r5:8 | r6:4P3 | r7:3K4 | r8:6k1 after Kf2; in B, test it against r1:8 | r2:8 | r3:3p4 | r4:8 | r5:8 | r6:4P3 | r7:4K1k1 | r8:8 after e4.
For Key Squares in Pawn Endgames, the first board's evidence boundary (after Kf2) is No tablebase outcome is asserted by this generated record; verify the exact FEN before publication. The second board's evidence boundary for Key Squares in Pawn Endgames 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 an outside passer used as a decoy, 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 r1:8 | r2:8 | r3:8 | r4:3p4 | r5:8 | r6:4P3 | r7:3K4 | r8:6k1; record two candidates, the reply to Kf2 and the correction. Repeat with B's side to move and r1:8 | r2:8 | r3:3p4 | r4:8 | r5:8 | r6:4P3 | r7:4K1k1 | r8:8; the changed board tests transfer rather than diagram memory.
After the drill, compare your notes with Rule Of The Square, Corresponding Squares, Outside Passed Pawn through the conversion move order. Keep A's rejected alternative beside B's chosen line e4; this shows whether the conclusion survived a new board signature.
Sources and scope
Sources for Key Squares in Pawn Endgames: 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 r1:8 | r2:8 | r3:8 | r4:3p4 | r5:8 | r6:4P3 | r7:3K4 | r8:6k1 / r1:8 | r2:8 | r3:3p4 | r4:8 | r5:8 | r6:4P3 | r7:4K1k1 | r8:8: this page does not claim that Kf2 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 active rook before the pawn push.