Quick answer
Modern Benoni is an opening choice: Modern Benoni move order and resulting pawn structure. Work from the first evidence position for Modern Benoni, and begin by testing c4.
Begin from c4 in rnbqkb1r/pp3ppp/3p1n2/2pP4/8/1Q3N2/PP2PPPP/RNB1KB1R b KQkq - 1 6. Read the first contact, the development debt and the pawn break that the move order makes possible. The evidence answer is: Modern Benoni: read the move order as a set of development and pawn-break decisions, then compare the opponent's most direct reply. Candidate line: c4 Nc3.
In the Modern Benoni 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 f7, Black pawn g7, Black pawn h7, Black pawn d6, Black knight f6, Black pawn c5, White pawn d5, White queen b3, White knight f3, White pawn a2, White pawn b2, White pawn e2, White pawn f2, White pawn g2, White pawn h2, White rook a1, White knight b1, White bishop c1, White king e1, White bishop f1, White rook h1; legal first moves Nbd7, Nc6, Na6, Bd7, Be6, Bf5, Bg4, Bh3. Treat this piece list as local to the diagram above; it is not a universal map for every similar position.
What the position is testing
The first evidence board tests Modern Benoni move order and resulting pawn structure; the second board tests Modern Benoni move order and resulting pawn structure. A opens with the string d4 Nf6 c4 e6 Nf3 c5 d5 exd5 cxd5 d6 Qb3, whereas B opens with d4 Nf6 c4 e6 Nf3 c5 d5 exd5 h3 Rg8. Background terms live on the Chess Wiki and the Openings hub. Then compare Opening Principles with Nimzo Indian Rubinstein, Dutch Stonewall, London System Against Early C5 around the exchange that changes the minor pieces.
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 f7, Black pawn g7, Black pawn h7, Black pawn d6, Black knight f6, Black pawn c5, White pawn d5, White queen b3, White knight f3, White pawn a2, White pawn b2, White pawn e2, White pawn f2, White pawn g2, White pawn h2, White rook a1, White knight b1, White bishop c1, White king e1, White bishop f1, 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 rook g8, Black pawn a7, Black pawn b7, Black pawn d7, Black pawn f7, Black pawn g7, Black pawn h7, Black knight f6, Black pawn c5, Black pawn d5, White pawn c4, White knight f3, White pawn h3, White pawn a2, White pawn b2, White pawn e2, White pawn f2, White pawn g2, White rook a1, White knight b1, White bishop c1, White queen d1, White king e1, White bishop f1, White rook h1; legal first moves cxd5, Nd4, Ne5, Ng5, Nh4, Nh2, Ng1, Nfd2. Compare the side to move before comparing the labels in the context of the cost of an early queen move.
Topic dossier for this page and board pair r1:rnbqkb1r | r2:pp3ppp | r3:3p1n2 | r4:2pP4 | r5:8 | r6:1Q3N2 | r7:PP2PPPP | r8:RNB1KB1R / r1:rnbqkbr1 | r2:pp1p1ppp | r3:5n2 | r4:2pp4 | r5:2P5 | r6:5N1P | r7:PP2PPP1 | r8:RNBQKB1R: start with the exchange that changes the minor pieces; then test the cost of an early queen move; keep the difference between a main line and a sideline separate from the color-complex decision; use the square that anchors the plan as the transfer check; and reserve the point where theory ends for the exception.
Move order and plan
On the first board, calculate c4 Nc3 after c4 and write down the opponent's best reply around the exchange that changes the minor pieces. On the second board, calculate e4 after e4 and check the cost of an early queen move. 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 point where theory ends.
Key claim: Modern Benoni is illustrated here by Modern Benoni move order and resulting pawn structure; the first concrete test is c4. The board anchor is rnbqkb1r/pp3ppp/3p1n2/2pP4/8/1Q3N2/PP2PPPP/RNB1KB1R; 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 modern benoni useful in a real game?”, 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 rnbqkbr1/pp1p1ppp/5n2/2pp4/2P5/5N1P/PP2PPP1/RNBQKB1R. The evidence records Illustrative move-order evidence; no opening score, engine evaluation, or popularity claim is asserted and the second board signature r1:rnbqkbr1 | r2:pp1p1ppp | r3:5n2 | r4:2pp4 | r5:2P5 | r6:5N1P | r7:PP2PPP1 | r8:RNBQKB1R. The false-positive test is whether the difference between a main line and a sideline appears without the color-complex decision, so the conclusion is useful only when the stated condition survives that concrete test.
Evidence positions
example-1: Modern Benoni move order and resulting pawn structure
Show answer
Modern Benoni: read the move order as a set of development and pawn-break decisions, then compare the opponent's most direct reply. Candidate line: c4 Nc3.
Why this position is here: Modern Benoni is represented by Modern Benoni move order and resulting pawn structure. The reproducible setup is d4 Nf6 c4 e6 Nf3 c5 d5 exd5 cxd5 d6 Qb3 with board anchor rnbqkb1r/pp3ppp/3p1n2/2pP4/8/1Q3N2/PP2PPPP/RNB1KB1R; replay it before treating the board as an abstract illustration.
FEN: rnbqkb1r/pp3ppp/3p1n2/2pP4/8/1Q3N2/PP2PPPP/RNB1KB1R b KQkq - 1 6
Question: What is the first concrete decision in this modern benoni position?
Answer cue: Modern Benoni: read the move order as a set of development and pawn-break decisions, then compare the opponent's most direct reply. Candidate line: c4 Nc3. The first candidate to test is c4. Replay c4 Nc3 on board anchor rnbqkb1r/pp3ppp/3p1n2/2pP4/8/1Q3N2/PP2PPPP/RNB1KB1R 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: Modern Benoni move order and resulting pawn structure
Show answer
Modern Benoni: read the move order as a set of development and pawn-break decisions, then compare the opponent's most direct reply. Candidate line: e4.
Why this position is here: Modern Benoni is represented by Modern Benoni move order and resulting pawn structure. The reproducible setup is d4 Nf6 c4 e6 Nf3 c5 d5 exd5 h3 Rg8 with board anchor rnbqkbr1/pp1p1ppp/5n2/2pp4/2P5/5N1P/PP2PPP1/RNBQKB1R; replay it before treating the board as an abstract illustration.
FEN: rnbqkbr1/pp1p1ppp/5n2/2pp4/2P5/5N1P/PP2PPP1/RNBQKB1R w KQq - 1 6
Question: What is the first concrete decision in this modern benoni position?
Answer cue: Modern Benoni: read the move order as a set of development and pawn-break decisions, then compare the opponent's most direct reply. Candidate line: e4. The first candidate to test is e4. Replay e4 on board anchor rnbqkbr1/pp1p1ppp/5n2/2pp4/2P5/5N1P/PP2PPP1/RNBQKB1R 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: Modern Benoni move order and resulting pawn structure
Show answer
Modern Benoni: 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: Modern Benoni is represented by Modern Benoni move order and resulting pawn structure. The reproducible setup is d4 Nf6 c4 e6 Nf3 c5 b3 with board anchor rnbqkb1r/pp1p1ppp/4pn2/2p5/2PP4/1P3N2/P3PPPP/RNBQKB1R; replay it before treating the board as an abstract illustration.
FEN: rnbqkb1r/pp1p1ppp/4pn2/2p5/2PP4/1P3N2/P3PPPP/RNBQKB1R b KQkq - 0 4
Question: What is the first concrete decision in this modern benoni position?
Answer cue: Modern Benoni: 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 rnbqkb1r/pp1p1ppp/4pn2/2p5/2PP4/1P3N2/P3PPPP/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 c4 Nc3, source opening-database. The reproducible setup is d4 Nf6 c4 e6 Nf3 c5 d5 exd5 cxd5 d6 Qb3 with board anchor rnbqkb1r/pp3ppp/3p1n2/2pP4/8/1Q3N2/PP2PPPP/RNB1KB1R; replay it before treating the board as an abstract illustration. If A does not expose Modern Benoni move order and resulting pawn structure, correct the evidence before relying on the prose.
Read the second example (id example-2) separately: continuation e4, source opening-database. Its feature is Modern Benoni 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 rook g8, Black pawn a7, Black pawn b7, Black pawn d7, Black pawn f7, Black pawn g7, Black pawn h7, Black knight f6, Black pawn c5, Black pawn d5, White pawn c4, White knight f3, White pawn h3, White pawn a2, White pawn b2, White pawn e2, White pawn f2, White pawn g2, White rook a1, White knight b1, White bishop c1, White queen d1, White king e1, White bishop f1, White rook h1; legal first moves cxd5, Nd4, Ne5, Ng5, Nh4, Nh2, Ng1, Nfd2. Compare what changes between c4 and e4.
Where the idea stops
The main mistake to avoid with Modern Benoni is memorising a sequence without checking which move changes the strategic problem. In A, the missing condition must be located in r1:rnbqkb1r | r2:pp3ppp | r3:3p1n2 | r4:2pP4 | r5:8 | r6:1Q3N2 | r7:PP2PPPP | r8:RNB1KB1R after c4; in B, test it against r1:rnbqkbr1 | r2:pp1p1ppp | r3:5n2 | r4:2pp4 | r5:2P5 | r6:5N1P | r7:PP2PPP1 | r8:RNBQKB1R after e4.
For Modern Benoni, the first board's evidence boundary (after c4) is Illustrative move-order evidence; no opening score, engine evaluation, or popularity claim is asserted. The second board's evidence boundary for Modern Benoni 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 square that anchors the plan, 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:pp3ppp | r3:3p1n2 | r4:2pP4 | r5:8 | r6:1Q3N2 | r7:PP2PPPP | r8:RNB1KB1R; record two candidates, the reply to c4 Nc3 and the correction. Repeat with B's side to move and r1:rnbqkbr1 | r2:pp1p1ppp | r3:5n2 | r4:2pp4 | r5:2P5 | r6:5N1P | r7:PP2PPP1 | r8:RNBQKB1R; the changed board tests transfer rather than diagram memory.
After the drill, compare your notes with Nimzo Indian Rubinstein, Dutch Stonewall, London System Against Early C5 through the color-complex decision. 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 Modern Benoni: 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:pp3ppp | r3:3p1n2 | r4:2pP4 | r5:8 | r6:1Q3N2 | r7:PP2PPPP | r8:RNB1KB1R / r1:rnbqkbr1 | r2:pp1p1ppp | r3:5n2 | r4:2pp4 | r5:2P5 | r6:5N1P | r7:PP2PPP1 | r8:RNBQKB1R: this page does not claim that c4 Nc3 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 difference between a main line and a sideline.