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Queen's Gambit DeclinedModern Variation, Knight Defense

D51For BlackSolid

1. d4 d5 2. c4 e6 3. Nc3 Nf6 4. Bg5 Nbd7

A line for Black. Every figure below is computed separately for each rating band, and every one carries its own sample size.

Win rate, Black
45.8%45.8%49.2%45.8%
Band 600, n = 24Band 1000, n = 612Band 1400, n = 1,098Band 1800, n = 4,543
Blunder rate
pending33.3%pending20.0%
Band median 44.6%Band median 42.9%Band median 40.0%Band median 36.4%
Tier
-DCC
Black, band 600Black, band 1000Black, band 1400Black, band 1800
Share of games
0.0%0.0%0.0%0.0%
Of band 600 gamesOf band 1000 gamesOf band 1400 gamesOf band 1800 games
Every band, source period 2026-05
BandWhiteDrawBlackBlunderBook exitGamesTier
60054.2%0.0%45.8%--24-
100050.0%4.3%45.8%33.3%ply 8.0612D
140046.9%3.9%49.2%--1,098C
180049.1%5.1%45.8%20.0%ply 8.04,543C

Results by band

What it actually does, band by band.

All four bands are on the page. The one matching your rating is marked. Nothing here is averaged across bands.

600Your band

At 600, the Queen's Gambit Declined: Modern Variation, Knight Defense scores 45.8% for Black across 24 games. The sample at 600 is too small to grade honestly.

1000Your bandD at 1000Blunder rate 33.3%, band median 42.9%

At 1000, the Queen's Gambit Declined: Modern Variation, Knight Defense scores 45.8% for Black across 612 games. Most openings score better than this at this level. Games in this line leave known theory around move 4 on average, and 33.3% include an early material blunder (3 games at 1000).

1400Your bandC at 1400

At 1400, the Queen's Gambit Declined: Modern Variation, Knight Defense scores 49.2% for Black across 1,098 games. That is below average at this level.

1800Your bandC at 1800Blunder rate 20.0%, band median 36.4%

At 1800, the Queen's Gambit Declined: Modern Variation, Knight Defense scores 45.8% for Black across 4,543 games. That is below average at this level. Games in this line leave known theory around move 4 on average, and 20.0% include an early material blunder (5 games at 1800).

Blunders and traps

How this opening ends early.

The known traps that live inside the Queen's Gambit Declined: Modern Variation, Knight Defense. The rates are how often each one actually lands in your band, counted against every sampled game in that band.

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Elephant Trap

1. d4 d5 2. c4 e6 3. Nc3 Nf6 4. Bg5 Nbd7 5. cxd5 exd5 6. Nxd5

Sprung by Black. The move that invites it is Nxd5.

The d5 pawn is poisoned: 6. Nxd5 Nxd5 wins a piece because the b4 check regains the queen. One of the oldest Queen's Gambit traps.

0 hitsBand 600
0 hitsBand 1000
0 hitsBand 1400
0 hitsBand 1800

Read as: how often this trap line is completed per sampled game in the band.

How the Blunder Rate is measured. A material swing of three points or more inside the first 24 half-moves after leaving book, detected without an engine evaluation. It is a proxy for how sharp a position is in practice, not an engine verdict, and it is computed from a monthly game sample rather than the full corpus behind the win rates. Trap hit rates count a trap only when its full line is completed on the board.

See how the Queen's Gambit Declined: Modern Variation, Knight Defense ranks against every other opening in your band.

Open the tier list

Questions

Common questions about this page.

At 600, the Queen's Gambit Declined: Modern Variation, Knight Defense scores 45.8% for Black across 24 games. The sample at 600 is too small to grade honestly.

At 1000, the Queen's Gambit Declined: Modern Variation, Knight Defense scores 45.8% for Black across 612 games. Most openings score better than this at this level. Games in this line leave known theory around move 4 on average, and 33.3% include an early material blunder (3 games at 1000).

The Queen's Gambit Declined: Modern Variation, Knight Defense (D51) is a line for Black. The main line runs 1. d4 d5 2. c4 e6 3. Nc3 Nf6 4. Bg5 Nbd7.