Quick answer
Pawn Breakthrough is an endgame technique: promotion race and tempo. Work from the first evidence position for Pawn Breakthrough, and begin by testing d5.
Begin from d5 in 8/8/3p4/8/4P3/5K2/7k/8 b - - 2 3. Count the material, king routes, promotion squares and reserve tempi before applying a theoretical rule. The evidence answer is: Pawn Breakthrough: calculate both promotion paths and include checks before assuming the faster pawn wins. Candidate line: d5.
In the Pawn Breakthrough example, notice: side Black; pieces Black pawn d6, White pawn e4, White king f3, Black king h2; legal first moves d5, Kh3, Kh1, Kg1. The listed material and candidate moves belong only to this FEN example and should not be generalised.
Material and result question
The first evidence board tests promotion race and tempo; the second board tests promotion race and tempo. When a recorded line exists, board A starts from direct FEN setup while board B starts from direct FEN setup. Cross-check wording on the Chess Wiki and on the Endgames hub. Then compare Material Values with Triangulation, Pawn Race Calculation, Protected Passed Pawn around a theoretical draw with practical tests.
The two inventories make the distinction concrete. A contains side Black; pieces Black pawn d6, White pawn e4, White king f3, Black king h2; legal first moves d5, Kh3, Kh1, Kg1; B contains side White; pieces Black pawn d5, White pawn e4, White king f2, Black king h2; legal first moves e5, exd5, Ke3, Kf3, Kf1, Ke1, Ke2. Compare the side to move before comparing the labels in the context of a stalemate resource.
Topic dossier for this page and board pair r1:8 | r2:8 | r3:3p4 | r4:8 | r5:4P3 | r6:5K2 | r7:7k | r8:8 / r1:8 | r2:8 | r3:8 | r4:3p4 | r5:4P3 | r6:8 | r7:5K1k | r8:8: start with a theoretical draw with practical tests; then test a stalemate resource; keep the bishop's color complex separate from checking distance behind the passer; use king opposition on the critical file as the transfer check; and reserve the king's route around a pawn chain for the exception.
Conversion or defense plan
On the first board, calculate d5 after d5 and write down the opponent's best reply around a theoretical draw with practical tests. On the second board, calculate Kf1 after Kf1 and check a stalemate resource. 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 king's route around a pawn chain.
Key claim: Pawn Breakthrough is illustrated here by promotion race and tempo; the first concrete test is d5. The board anchor is 8/8/3p4/8/4P3/5K2/7k/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 pawn breakthrough, and how should each side play them?”, compare the recorded setup with Kf1 and the opponent's reply. The decision is useful only when the stated condition survives that concrete test on board 8/8/8/3p4/4P3/8/5K1k/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 | r3:8 | r4:3p4 | r5:4P3 | r6:8 | r7:5K1k | r8:8. The false-positive test is whether the bishop's color complex appears without checking distance behind the passer, so the conclusion is useful only when the stated condition survives that concrete test.
Evidence positions
example-1: promotion race and tempo
Show answer
Pawn Breakthrough: calculate both promotion paths and include checks before assuming the faster pawn wins. Candidate line: d5.
Why this position is here: Pawn Breakthrough is represented by promotion race and tempo. This is a direct FEN setup with board anchor 8/8/3p4/8/4P3/5K2/7k/8; no opening history is inferred from the diagram.
FEN: 8/8/3p4/8/4P3/5K2/7k/8 b - - 2 3
Question: What is the first concrete decision in this pawn breakthrough position?
Answer cue: Pawn Breakthrough: 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 8/8/3p4/8/4P3/5K2/7k/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: promotion race and tempo
Show answer
Pawn Breakthrough: calculate both promotion paths and include checks before assuming the faster pawn wins. Candidate line: Kf1.
Why this position is here: Pawn Breakthrough is represented by promotion race and tempo. This is a direct FEN setup with board anchor 8/8/8/3p4/4P3/8/5K1k/8; no opening history is inferred from the diagram.
FEN: 8/8/8/3p4/4P3/8/5K1k/8 w - - 0 3
Question: What is the first concrete decision in this pawn breakthrough position?
Answer cue: Pawn Breakthrough: calculate both promotion paths and include checks before assuming the faster pawn wins. Candidate line: Kf1. The first candidate to test is Kf1. Replay Kf1 on board anchor 8/8/8/3p4/4P3/8/5K1k/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
Pawn Breakthrough: calculate both promotion paths and include checks before assuming the faster pawn wins. Candidate line: e4.
Why this position is here: Pawn Breakthrough is represented by promotion race and tempo. This is a direct FEN setup with board anchor 8/8/8/3p4/8/4P3/4K3/7k; no opening history is inferred from the diagram.
FEN: 8/8/8/3p4/8/4P3/4K3/7k w - - 0 2
Question: What is the first concrete decision in this pawn breakthrough position?
Answer cue: Pawn Breakthrough: 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 8/8/8/3p4/8/4P3/4K3/7k 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 d5, source tablebase. This is a direct FEN setup with board anchor 8/8/3p4/8/4P3/5K2/7k/8; 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 Kf1, source tablebase. Its feature is promotion race and tempo; inventory side White; pieces Black pawn d5, White pawn e4, White king f2, Black king h2; legal first moves e5, exd5, Ke3, Kf3, Kf1, Ke1, Ke2. Compare what changes between d5 and Kf1.
Boundary cases
The main mistake to avoid with Pawn Breakthrough 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 | r3:3p4 | r4:8 | r5:4P3 | r6:5K2 | r7:7k | r8:8 after d5; in B, test it against r1:8 | r2:8 | r3:8 | r4:3p4 | r5:4P3 | r6:8 | r7:5K1k | r8:8 after Kf1.
For Pawn Breakthrough, the first board's evidence boundary (after d5) is No tablebase outcome is asserted by this generated record; verify the exact FEN before publication. The second board's evidence boundary for Pawn Breakthrough 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 king opposition on the critical file, 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 | r3:3p4 | r4:8 | r5:4P3 | r6:5K2 | r7:7k | r8:8; record two candidates, the reply to d5 and the correction. Repeat with B's side to move and r1:8 | r2:8 | r3:8 | r4:3p4 | r5:4P3 | r6:8 | r7:5K1k | r8:8; the changed board tests transfer rather than diagram memory.
After the drill, compare your notes with Triangulation, Pawn Race Calculation, Protected Passed Pawn through checking distance behind the passer. Keep A's rejected alternative beside B's chosen line Kf1; this shows whether the conclusion survived a new board signature.
Sources and scope
Sources for Pawn Breakthrough: 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 | r3:3p4 | r4:8 | r5:4P3 | r6:5K2 | r7:7k | r8:8 / r1:8 | r2:8 | r3:8 | r4:3p4 | r5:4P3 | r6:8 | r7:5K1k | r8:8: this page does not claim that d5 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 bishop's color complex.