Quick answer
Larsen Attack is an opening choice: Larsen Attack move order and resulting pawn structure. Work from the first evidence position for Larsen Attack, and begin by testing d4.
Begin from d4 in rnbqkb1r/pp2pppp/5n2/2pp4/P7/1P2P3/1BPP1PPP/RN1QKBNR b KQkq - 0 4. Read the first contact, the development debt and the pawn break that the move order makes possible. The evidence answer is: Larsen Attack: read the move order as a set of development and pawn-break decisions, then compare the opponent's most direct reply. Candidate line: d4 e4.
In the Larsen Attack example, notice: side Black; pieces Black rook a8, Black knight b8, Black bishop c8, Black queen d8, Black king e8, Black bishop f8, Black rook h8, Black pawn a7, Black pawn b7, Black pawn e7, Black pawn f7, Black pawn g7, Black pawn h7, Black knight f6, Black pawn c5, Black pawn d5, White pawn a4, White pawn b3, White pawn e3, White bishop b2, White pawn c2, White pawn d2, White pawn f2, White pawn g2, White pawn h2, White rook a1, White knight b1, White queen d1, White king e1, White bishop f1, White knight g1, White rook h1; legal first moves Nbd7, Nc6, Na6, Bd7, Be6, Bf5, Bg4, Bh3. Keep the piece census tied to this diagram—other positions with the same theme can look completely different.
What the position is testing
The first evidence board tests Larsen Attack move order and resulting pawn structure; the second board tests Larsen Attack move order and resulting pawn structure. Sequence A is b3 d5 Bb2 Nf6 e3 c5 a4. Sequence B is b3 d5 Bb2 g5. Compare them only after setting both FENs. The Chess Wiki and the Openings hub collect the shared vocabulary. Then compare Opening Principles with King S Pawn Opening, Modern Defense, Nimzo Indian Defense around the cost of an early queen move.
The two inventories make the distinction concrete. A contains side Black; pieces Black rook a8, Black knight b8, Black bishop c8, Black queen d8, Black king e8, Black bishop f8, Black rook h8, Black pawn a7, Black pawn b7, Black pawn e7, Black pawn f7, Black pawn g7, Black pawn h7, Black knight f6, Black pawn c5, Black pawn d5, White pawn a4, White pawn b3, White pawn e3, White bishop b2, White pawn c2, White pawn d2, White pawn f2, White pawn g2, White pawn h2, White rook a1, White knight b1, White queen d1, White king e1, White bishop f1, White knight g1, White rook h1; legal first moves Nbd7, Nc6, Na6, Bd7, Be6, Bf5, Bg4, Bh3; B contains side White; pieces Black rook a8, Black knight b8, Black bishop c8, Black queen d8, Black king e8, Black bishop f8, Black knight g8, Black rook h8, Black pawn a7, Black pawn b7, Black pawn c7, Black pawn e7, Black pawn f7, Black pawn h7, Black pawn d5, Black pawn g5, White pawn b3, White pawn a2, White bishop b2, White pawn c2, White pawn d2, White pawn e2, White pawn f2, White pawn g2, White pawn h2, White rook a1, White knight b1, White queen d1, White king e1, White bishop f1, White knight g1, White rook h1; legal first moves b4, a3, a4, Ba3, Bc3, Bd4, Be5, Bf6. Compare the side to move before comparing the labels in the context of the exchange that changes the minor pieces.
Topic dossier for this page and board pair r1:rnbqkb1r | r2:pp2pppp | r3:5n2 | r4:2pp4 | r5:P7 | r6:1P2P3 | r7:1BPP1PPP | r8:RN1QKBNR / r1:rnbqkbnr | r2:ppp1pp1p | r3:8 | r4:3p2p1 | r5:8 | r6:1P6 | r7:PBPPPPPP | r8:RN1QKBNR: start with the cost of an early queen move; then test the exchange that changes the minor pieces; keep the color-complex decision separate from the difference between a main line and a sideline; use the point where theory ends as the transfer check; and reserve the square that anchors the plan for the exception.
Move order and plan
On the first board, calculate d4 e4 after d4 and write down the opponent's best reply around the cost of an early queen move. On the second board, calculate d4 after d4 and check the exchange that changes the minor pieces. Compare the first plan for both sides before choosing a move from memory; the same opening name can lead to different positions after one exchange. In this case the useful condition is the square that anchors the plan.
Key claim: Larsen Attack is illustrated here by Larsen Attack move order and resulting pawn structure; the first concrete test is d4. The board anchor is rnbqkb1r/pp2pppp/5n2/2pp4/P7/1P2P3/1BPP1PPP/RN1QKBNR; the example is intentionally narrower than the topic label and should not be generalised without checking the surrounding position..
Practical boundary: To answer “Which move-order choices, plans, and pawn breaks make larsen attack useful in a real game?”, compare the recorded setup with d4 and the opponent's reply. The decision is useful only when the stated condition survives that concrete test on board rnbqkbnr/ppp1pp1p/8/3p2p1/8/1P6/PBPPPPPP/RN1QKBNR. The evidence records Illustrative move-order evidence; no opening score, engine evaluation, or popularity claim is asserted and the second board signature r1:rnbqkbnr | r2:ppp1pp1p | r3:8 | r4:3p2p1 | r5:8 | r6:1P6 | r7:PBPPPPPP | r8:RN1QKBNR. The false-positive test is whether the color-complex decision appears without the difference between a main line and a sideline, so the conclusion is useful only when the stated condition survives that concrete test.
Evidence positions
example-1: Larsen Attack move order and resulting pawn structure
Show answer
Larsen Attack: read the move order as a set of development and pawn-break decisions, then compare the opponent's most direct reply. Candidate line: d4 e4.
Why this position is here: Larsen Attack is represented by Larsen Attack move order and resulting pawn structure. The reproducible setup is b3 d5 Bb2 Nf6 e3 c5 a4 with board anchor rnbqkb1r/pp2pppp/5n2/2pp4/P7/1P2P3/1BPP1PPP/RN1QKBNR; replay it before treating the board as an abstract illustration.
FEN: rnbqkb1r/pp2pppp/5n2/2pp4/P7/1P2P3/1BPP1PPP/RN1QKBNR b KQkq - 0 4
Question: What is the first concrete decision in this larsen attack position?
Answer cue: Larsen Attack: read the move order as a set of development and pawn-break decisions, then compare the opponent's most direct reply. Candidate line: d4 e4. The first candidate to test is d4. Replay d4 e4 on board anchor rnbqkb1r/pp2pppp/5n2/2pp4/P7/1P2P3/1BPP1PPP/RN1QKBNR and write down what changes after it.
Evidence boundary: Illustrative move-order evidence; no opening score, engine evaluation, or popularity claim is asserted.
example-2: Larsen Attack move order and resulting pawn structure
Show answer
Larsen Attack: read the move order as a set of development and pawn-break decisions, then compare the opponent's most direct reply. Candidate line: d4.
Why this position is here: Larsen Attack is represented by Larsen Attack move order and resulting pawn structure. The reproducible setup is b3 d5 Bb2 g5 with board anchor rnbqkbnr/ppp1pp1p/8/3p2p1/8/1P6/PBPPPPPP/RN1QKBNR; replay it before treating the board as an abstract illustration.
FEN: rnbqkbnr/ppp1pp1p/8/3p2p1/8/1P6/PBPPPPPP/RN1QKBNR w KQkq - 0 3
Question: What is the first concrete decision in this larsen attack position?
Answer cue: Larsen Attack: read the move order as a set of development and pawn-break decisions, then compare the opponent's most direct reply. Candidate line: d4. The first candidate to test is d4. Replay d4 on board anchor rnbqkbnr/ppp1pp1p/8/3p2p1/8/1P6/PBPPPPPP/RN1QKBNR and write down what changes after it.
Evidence boundary: Illustrative move-order evidence; no opening score, engine evaluation, or popularity claim is asserted.
example-3: Larsen Attack move order and resulting pawn structure
Show answer
Larsen Attack: read the move order as a set of development and pawn-break decisions, then compare the opponent's most direct reply. Candidate line: d4.
Why this position is here: Larsen Attack is represented by Larsen Attack move order and resulting pawn structure. The reproducible setup is b3 d5 e4 Bh3 with board anchor rn1qkbnr/ppp1pppp/8/3p4/4P3/1P5b/P1PP1PPP/RNBQKBNR; replay it before treating the board as an abstract illustration.
FEN: rn1qkbnr/ppp1pppp/8/3p4/4P3/1P5b/P1PP1PPP/RNBQKBNR w KQkq - 1 3
Question: What is the first concrete decision in this larsen attack position?
Answer cue: Larsen Attack: read the move order as a set of development and pawn-break decisions, then compare the opponent's most direct reply. Candidate line: d4. The first candidate to test is d4. Replay d4 on board anchor rn1qkbnr/ppp1pppp/8/3p4/4P3/1P5b/P1PP1PPP/RNBQKBNR and write down what changes after it.
Evidence boundary: Illustrative move-order evidence; no opening score, engine evaluation, or popularity claim is asserted.
Reading the line
Read the first example (id example-1) as a complete record: continuation d4 e4, source opening-database. The reproducible setup is b3 d5 Bb2 Nf6 e3 c5 a4 with board anchor rnbqkb1r/pp2pppp/5n2/2pp4/P7/1P2P3/1BPP1PPP/RN1QKBNR; replay it before treating the board as an abstract illustration. If A does not expose Larsen Attack move order and resulting pawn structure, correct the evidence before relying on the prose.
Read the second example (id example-2) separately: continuation d4, source opening-database. Its feature is Larsen Attack move order and resulting pawn structure; inventory side White; pieces Black rook a8, Black knight b8, Black bishop c8, Black queen d8, Black king e8, Black bishop f8, Black knight g8, Black rook h8, Black pawn a7, Black pawn b7, Black pawn c7, Black pawn e7, Black pawn f7, Black pawn h7, Black pawn d5, Black pawn g5, White pawn b3, White pawn a2, White bishop b2, White pawn c2, White pawn d2, White pawn e2, White pawn f2, White pawn g2, White pawn h2, White rook a1, White knight b1, White queen d1, White king e1, White bishop f1, White knight g1, White rook h1; legal first moves b4, a3, a4, Ba3, Bc3, Bd4, Be5, Bf6. Compare what changes between d4 and d4.
Where the idea stops
The main mistake to avoid with Larsen Attack is memorising a sequence without checking which move changes the strategic problem. In A, the missing condition must be located in r1:rnbqkb1r | r2:pp2pppp | r3:5n2 | r4:2pp4 | r5:P7 | r6:1P2P3 | r7:1BPP1PPP | r8:RN1QKBNR after d4; in B, test it against r1:rnbqkbnr | r2:ppp1pp1p | r3:8 | r4:3p2p1 | r5:8 | r6:1P6 | r7:PBPPPPPP | r8:RN1QKBNR after d4.
For Larsen Attack, the first board's evidence boundary (after d4) is Illustrative move-order evidence; no opening score, engine evaluation, or popularity claim is asserted. The second board's evidence boundary for Larsen Attack is Illustrative move-order evidence; no opening score, engine evaluation, or popularity claim is asserted. If a trusted source or careful calculation changes the conclusion around the point where theory ends, update both the evidence record and this article.
Practice from a real game
replay the recorded move order, pause before the first irreversible pawn move, and write one plan for each side. Start with A's side to move and r1:rnbqkb1r | r2:pp2pppp | r3:5n2 | r4:2pp4 | r5:P7 | r6:1P2P3 | r7:1BPP1PPP | r8:RN1QKBNR; record two candidates, the reply to d4 e4 and the correction. Repeat with B's side to move and r1:rnbqkbnr | r2:ppp1pp1p | r3:8 | r4:3p2p1 | r5:8 | r6:1P6 | r7:PBPPPPPP | r8:RN1QKBNR; the changed board tests transfer rather than diagram memory.
After the drill, compare your notes with King S Pawn Opening, Modern Defense, Nimzo Indian Defense through the difference between a main line and a sideline. Keep A's rejected alternative beside B's chosen line d4; this shows whether the conclusion survived a new board signature.
Sources and scope
Sources for Larsen Attack: Chessprogramming opening-book reference, 1chess.online editorial scope. Source ids are opening-database, original-analysis. Primary evidence hook: opening-database. Comparisons and practice notes are editorial. Evidence revision: 2026-08-remediation-r2.
Scope note for board pair r1:rnbqkb1r | r2:pp2pppp | r3:5n2 | r4:2pp4 | r5:P7 | r6:1P2P3 | r7:1BPP1PPP | r8:RN1QKBNR / r1:rnbqkbnr | r2:ppp1pp1p | r3:8 | r4:3p2p1 | r5:8 | r6:1P6 | r7:PBPPPPPP | r8:RN1QKBNR: this page does not claim that d4 e4 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 color-complex decision.