Quick answer
King's Indian Attack is an opening choice: King's Indian Attack move order and resulting pawn structure. Work from the first evidence position for King's Indian Attack, and begin by testing Nc6.
Begin from Nc6 in rnbqk1r1/ppppbppp/4pn2/8/8/6P1/PPPPPPBP/RNBQNRK1 b q - 5 5. Read the first contact, the development debt and the pawn break that the move order makes possible. The evidence answer is: King's Indian Attack: read the move order as a set of development and pawn-break decisions, then compare the opponent's most direct reply. Candidate line: Nc6.
In the King's Indian Attack example, notice: side Black; pieces Black rook a8, Black knight b8, Black bishop c8, Black queen d8, Black king e8, Black rook g8, Black pawn a7, Black pawn b7, Black pawn c7, Black pawn d7, Black bishop e7, Black pawn f7, Black pawn g7, Black pawn h7, Black pawn e6, Black knight f6, White pawn g3, White pawn a2, White pawn b2, White pawn c2, White pawn d2, White pawn e2, White pawn f2, White bishop g2, White pawn h2, White rook a1, White knight b1, White bishop c1, White queen d1, White knight e1, White rook f1, White king g1; legal first moves Nc6, Na6, Kf8, Rh8, Rf8, a6, a5, b6. The candidates above are taken from this FEN snapshot and should be re-checked on any new board.
What the position is testing
The first evidence board tests King's Indian Attack move order and resulting pawn structure; the second board tests King's Indian Attack move order and resulting pawn structure. A is seeded by the moves Nf3 Nf6 g3 e6 Bg2 Be7 O-O Rg8 Ne1. B is seeded by Nf3 Nf6 g3 e6 Bg2 Be7. Related definitions sit in the Chess Wiki and the Openings hub. Then compare Opening Principles with King S Gambit, King S Pawn Opening, Larsen Attack 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 rook g8, Black pawn a7, Black pawn b7, Black pawn c7, Black pawn d7, Black bishop e7, Black pawn f7, Black pawn g7, Black pawn h7, Black pawn e6, Black knight f6, White pawn g3, White pawn a2, White pawn b2, White pawn c2, White pawn d2, White pawn e2, White pawn f2, White bishop g2, White pawn h2, White rook a1, White knight b1, White bishop c1, White queen d1, White knight e1, White rook f1, White king g1; legal first moves Nc6, Na6, Kf8, Rh8, Rf8, a6, a5, b6; B contains side White; pieces Black rook a8, Black knight b8, Black bishop c8, Black queen d8, Black king e8, Black rook h8, Black pawn a7, Black pawn b7, Black pawn c7, Black pawn d7, Black bishop e7, Black pawn f7, Black pawn g7, Black pawn h7, Black pawn e6, Black knight f6, White knight f3, White pawn g3, White pawn a2, White pawn b2, White pawn c2, White pawn d2, White pawn e2, White pawn f2, White bishop g2, White pawn h2, White rook a1, White knight b1, White bishop c1, White queen d1, White king e1, White rook h1; legal first moves Nd4, Ne5, Ng5, Nh4, Ng1, g4, a3, a4. 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:rnbqk1r1 | r2:ppppbppp | r3:4pn2 | r4:8 | r5:8 | r6:6P1 | r7:PPPPPPBP | r8:RNBQNRK1 / r1:rnbqk2r | r2:ppppbppp | r3:4pn2 | r4:8 | r5:8 | r6:5NP1 | r7:PPPPPPBP | r8:RNBQK2R: 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 Nc6 after Nc6 and write down the opponent's best reply around the cost of an early queen move. On the second board, calculate d4 O-O 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: King's Indian Attack is illustrated here by King's Indian Attack move order and resulting pawn structure; the first concrete test is Nc6. The board anchor is rnbqk1r1/ppppbppp/4pn2/8/8/6P1/PPPPPPBP/RNBQNRK1; 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 king's indian 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 rnbqk2r/ppppbppp/4pn2/8/8/5NP1/PPPPPPBP/RNBQK2R. The evidence records Illustrative move-order evidence; no opening score, engine evaluation, or popularity claim is asserted and the second board signature r1:rnbqk2r | r2:ppppbppp | r3:4pn2 | r4:8 | r5:8 | r6:5NP1 | r7:PPPPPPBP | r8:RNBQK2R. 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: King's Indian Attack move order and resulting pawn structure
Show answer
King's Indian Attack: read the move order as a set of development and pawn-break decisions, then compare the opponent's most direct reply. Candidate line: Nc6.
Why this position is here: King's Indian Attack is represented by King's Indian Attack move order and resulting pawn structure. The reproducible setup is Nf3 Nf6 g3 e6 Bg2 Be7 O-O Rg8 Ne1 with board anchor rnbqk1r1/ppppbppp/4pn2/8/8/6P1/PPPPPPBP/RNBQNRK1; replay it before treating the board as an abstract illustration.
FEN: rnbqk1r1/ppppbppp/4pn2/8/8/6P1/PPPPPPBP/RNBQNRK1 b q - 5 5
Question: What is the first concrete decision in this king's indian attack position?
Answer cue: King's Indian Attack: read the move order as a set of development and pawn-break decisions, then compare the opponent's most direct reply. Candidate line: Nc6. The first candidate to test is Nc6. Replay Nc6 on board anchor rnbqk1r1/ppppbppp/4pn2/8/8/6P1/PPPPPPBP/RNBQNRK1 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: King's Indian Attack move order and resulting pawn structure
Show answer
King's Indian 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 O-O.
Why this position is here: King's Indian Attack is represented by King's Indian Attack move order and resulting pawn structure. The reproducible setup is Nf3 Nf6 g3 e6 Bg2 Be7 with board anchor rnbqk2r/ppppbppp/4pn2/8/8/5NP1/PPPPPPBP/RNBQK2R; replay it before treating the board as an abstract illustration.
FEN: rnbqk2r/ppppbppp/4pn2/8/8/5NP1/PPPPPPBP/RNBQK2R w KQkq - 2 4
Question: What is the first concrete decision in this king's indian attack position?
Answer cue: King's Indian 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 O-O. The first candidate to test is d4. Replay d4 O-O on board anchor rnbqk2r/ppppbppp/4pn2/8/8/5NP1/PPPPPPBP/RNBQK2R 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: King's Indian Attack move order and resulting pawn structure
Show answer
King's Indian Attack: read the move order as a set of development and pawn-break decisions, then compare the opponent's most direct reply. Candidate line: Nc6.
Why this position is here: King's Indian Attack is represented by King's Indian Attack move order and resulting pawn structure. The reproducible setup is Nf3 Nf6 g3 Ng8 b4 with board anchor rnbqkbnr/pppppppp/8/8/1P6/5NP1/P1PPPP1P/RNBQKB1R; replay it before treating the board as an abstract illustration.
FEN: rnbqkbnr/pppppppp/8/8/1P6/5NP1/P1PPPP1P/RNBQKB1R b KQkq - 0 3
Question: What is the first concrete decision in this king's indian attack position?
Answer cue: King's Indian Attack: read the move order as a set of development and pawn-break decisions, then compare the opponent's most direct reply. Candidate line: Nc6. The first candidate to test is Nc6. Replay Nc6 on board anchor rnbqkbnr/pppppppp/8/8/1P6/5NP1/P1PPPP1P/RNBQKB1R 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 Nc6, source opening-database. The reproducible setup is Nf3 Nf6 g3 e6 Bg2 Be7 O-O Rg8 Ne1 with board anchor rnbqk1r1/ppppbppp/4pn2/8/8/6P1/PPPPPPBP/RNBQNRK1; replay it before treating the board as an abstract illustration. If A does not expose King's Indian 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 O-O, source opening-database. Its feature is King's Indian 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 rook h8, Black pawn a7, Black pawn b7, Black pawn c7, Black pawn d7, Black bishop e7, Black pawn f7, Black pawn g7, Black pawn h7, Black pawn e6, Black knight f6, White knight f3, White pawn g3, White pawn a2, White pawn b2, White pawn c2, White pawn d2, White pawn e2, White pawn f2, White bishop g2, White pawn h2, White rook a1, White knight b1, White bishop c1, White queen d1, White king e1, White rook h1; legal first moves Nd4, Ne5, Ng5, Nh4, Ng1, g4, a3, a4. Compare what changes between Nc6 and d4.
Where the idea stops
The main mistake to avoid with King's Indian Attack is memorising a sequence without checking which move changes the strategic problem. In A, the missing condition must be located in r1:rnbqk1r1 | r2:ppppbppp | r3:4pn2 | r4:8 | r5:8 | r6:6P1 | r7:PPPPPPBP | r8:RNBQNRK1 after Nc6; in B, test it against r1:rnbqk2r | r2:ppppbppp | r3:4pn2 | r4:8 | r5:8 | r6:5NP1 | r7:PPPPPPBP | r8:RNBQK2R after d4.
For King's Indian Attack, the first board's evidence boundary (after Nc6) is Illustrative move-order evidence; no opening score, engine evaluation, or popularity claim is asserted. The second board's evidence boundary for King's Indian 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:rnbqk1r1 | r2:ppppbppp | r3:4pn2 | r4:8 | r5:8 | r6:6P1 | r7:PPPPPPBP | r8:RNBQNRK1; record two candidates, the reply to Nc6 and the correction. Repeat with B's side to move and r1:rnbqk2r | r2:ppppbppp | r3:4pn2 | r4:8 | r5:8 | r6:5NP1 | r7:PPPPPPBP | r8:RNBQK2R; the changed board tests transfer rather than diagram memory.
After the drill, compare your notes with King S Gambit, King S Pawn Opening, Larsen Attack through the difference between a main line and a sideline. Keep A's rejected alternative beside B's chosen line d4 O-O; this shows whether the conclusion survived a new board signature.
Sources and scope
Sources for King's Indian 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:rnbqk1r1 | r2:ppppbppp | r3:4pn2 | r4:8 | r5:8 | r6:6P1 | r7:PPPPPPBP | r8:RNBQNRK1 / r1:rnbqk2r | r2:ppppbppp | r3:4pn2 | r4:8 | r5:8 | r6:5NP1 | r7:PPPPPPBP | r8:RNBQK2R: this page does not claim that Nc6 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.