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Blackmar-Diemer Gambit: Diemer-Rosenberg Attack

114K games from Lichess · Updated January 2026

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Analyze this line move by move

White expected score · All ratings · All speeds

49.4%

45%55%
Floor49.2%

the worst score you would still get, 90% confident. At best 49.7%.

Measured over 114K games at this level and clock.

Playablewins about as often as it loses at this level

Roughly even — the middlegame decides more than this opening choice does.

Outcomes for White

Draw 3.1 · Score = win + ½ of the draws · 114K games

Rank among the families White can choose here
not ranked — this is a variation, not a family
Games in this context
114K
Best context
54.7% at 1600-1799 UltraBullet
Worst context
44.5% at 0-999 Rapid
Average game length
32 moves
Games that end decisively
96.9%
Draws
3.1%

Best and worst are the strongest and weakest squares with at least 500 games behind them. The table further down shows every square, including thinner ones.

Extra Analysis

Deep-dive datasets for this opening

Gambit BreakpointWhite

Peak: −1.0% · Breakpoint: 0-999

Time-Control Swing

Max swing: 9.3% · UltraBullet best · Classical worst

Where it holds · White score by rating × clock

Green is clearly ahead for White, grey is around even, red is behind. Tap a cell to measure there, and again to clear. It falls away as the rating rises: 50.8% at 0-999, 45.1% at 2500+.

RatingUBBulleBlitzRapidClass
0-999
1000-1199
1200-1399
1400-1599
1600-1799
1800-1999
2000-2199—
2200-2499—
2500+———

Expected score matrix by rating bracket and time control

  • 0-999 rating, UltraBullet: 50.0% expected score (20 games)
  • 0-999 rating, Bullet: 48.7% expected score (3,303 games)
  • 0-999 rating, Blitz: 47.3% expected score (5,243 games)
  • 0-999 rating, Rapid: 44.5% expected score (1,949 games)
  • 0-999 rating, Classical: 63.4% expected score (21 games)
  • 1000-1199 rating, UltraBullet: 54.3% expected score (22 games)
  • 1000-1199 rating, Bullet: 50.9% expected score (5,157 games)
  • 1000-1199 rating, Blitz: 48.3% expected score (6,578 games)
  • 1000-1199 rating, Rapid: 46.8% expected score (2,540 games)
  • 1000-1199 rating, Classical: 34.7% expected score (70 games)
  • 1200-1399 rating, UltraBullet: 49.1% expected score (54 games)
  • 1200-1399 rating, Bullet: 52.3% expected score (9,114 games)
  • 1200-1399 rating, Blitz: 47.5% expected score (6,207 games)
  • 1200-1399 rating, Rapid: 49.0% expected score (2,816 games)
  • 1200-1399 rating, Classical: 47.3% expected score (142 games)
  • 1400-1599 rating, UltraBullet: 49.1% expected score (104 games)
  • 1400-1599 rating, Bullet: 50.5% expected score (10,186 games)
  • 1400-1599 rating, Blitz: 49.1% expected score (8,964 games)
  • 1400-1599 rating, Rapid: 46.7% expected score (2,191 games)
  • 1400-1599 rating, Classical: 46.0% expected score (162 games)
  • 1600-1799 rating, UltraBullet: 54.7% expected score (3,183 games)
  • 1600-1799 rating, Bullet: 48.6% expected score (6,942 games)
  • 1600-1799 rating, Blitz: 49.7% expected score (8,935 games)
  • 1600-1799 rating, Rapid: 48.2% expected score (1,556 games)
  • 1600-1799 rating, Classical: 45.5% expected score (43 games)
  • 1800-1999 rating, UltraBullet: 44.1% expected score (167 games)
  • 1800-1999 rating, Bullet: 49.3% expected score (8,476 games)
  • 1800-1999 rating, Blitz: 50.7% expected score (6,749 games)
  • 1800-1999 rating, Rapid: 46.3% expected score (503 games)
  • 1800-1999 rating, Classical: 76.1% expected score (10 games)
  • 2000-2199 rating, UltraBullet: 40.7% expected score (20 games)
  • 2000-2199 rating, Bullet: 49.5% expected score (8,347 games)
  • 2000-2199 rating, Blitz: 51.9% expected score (1,367 games)
  • 2000-2199 rating, Rapid: 49.6% expected score (123 games)
  • 2200-2499 rating, UltraBullet: 70.0% expected score (1 games)
  • 2200-2499 rating, Bullet: 47.2% expected score (2,567 games)
  • 2200-2499 rating, Blitz: 52.0% expected score (97 games)
  • 2200-2499 rating, Rapid: 59.1% expected score (15 games)
  • 2500+ rating, Bullet: 40.3% expected score (19 games)
  • 2500+ rating, Blitz: 50.0% expected score (2 games)

Related Openings

Parent
Blackmar-Diemer Gambit
48.0%
Variations (5)
Blackmar-Diemer Gambit: Blackmar Gambit
50.9%
Blackmar-Diemer Gambit: von Popiel Gambit
51.0%
Blackmar-Diemer Gambit: Netherlands Variation
54.1%
Blackmar-Diemer Gambit: Zeller Defense
52.7%
Blackmar-Diemer Gambit: Fritz Attack
46.2%
Analyze Blackmar-Diemer Gambit: Diemer-Rosenberg Attack PositionsSee what each move is worth at your rating, move by move

Methodology

Across every rating and clock, the Blackmar-Diemer Gambit: Diemer-Rosenberg Attack scores 49.4% for White — we are 90% confident the real figure is between 49.2% and 49.7% — from 114K Lichess games. Win rate, draw rate and loss rate come from games played December 2023 to November 2025.

How the figures are made
Whose games these are
114K+ rated games played on Lichess (2023-12 to 2025-11). The games are Lichess’s and free for anyone to use. What is ours is the reading of them. Last rebuilt January 2026.
Which games we count
  • Rated games only — nothing casual.
  • Both players within 200 rating points of each other. A mismatch tells you about the gap, not about the opening.
  • At least 2 moves played.
  • A game is filed under White’s rating.
Why every number comes with a range
A number off a few hundred games is a guess. The same number off millions is a fact. The range is what tells them apart, and it is what the lists rank on — so an opening cannot reach the top on a lucky run of forty games. The more games behind a figure, the narrower its range.
How much we need before we say anything
An opening page needs 100 games. A gambit needs 50 games at a rating before we will say whether it pays there. The chaos and trap lists need 500 games overall and 250 games at one rating or clock.

Frequently Asked Questions

What is the Blackmar-Diemer Gambit: Diemer-Rosenberg Attack win rate?

Playing the Blackmar-Diemer Gambit: Diemer-Rosenberg Attack, White wins 47.8%, draws 3.1% and loses 49.1%. Counting a draw as half a point, that is an Expected Score of 49.4%. It rests on 114K rated games from Lichess.

At what rating does the Blackmar-Diemer Gambit: Diemer-Rosenberg Attack perform best?

The Blackmar-Diemer Gambit: Diemer-Rosenberg Attack performs best for White at 1200-1399, with an Expected Score of 50.1% (18K games) and the highest Floor of any rating with enough games to read.

Is the Blackmar-Diemer Gambit: Diemer-Rosenberg Attack better in blitz or rapid?

For White, the Blackmar-Diemer Gambit: Diemer-Rosenberg Attack scores higher in Blitz: an Expected Score of 49.0% in Blitz (44K games) against 47.1% in Rapid (12K games).

How sharp is the Blackmar-Diemer Gambit: Diemer-Rosenberg Attack?

The Blackmar-Diemer Gambit: Diemer-Rosenberg Attack has a sharpness score of 96.9 (very decisive), meaning 96.9% of games end decisively. Average game length is 32 moves.

What is the Blackmar-Diemer Gambit: Diemer-Rosenberg Attack win rate at 0-999?

At 0-999, White wins 45.6%, draws 3.3% and loses 51.2%. Counting a draw as half a point, that is an Expected Score of 47.2%. It rests on 11K Lichess games, which average 27 moves.

What is the Blackmar-Diemer Gambit: Diemer-Rosenberg Attack win rate at 1000-1199?

At 1000-1199, White wins 47.4%, draws 2.9% and loses 49.7%. Counting a draw as half a point, that is an Expected Score of 48.9%. It rests on 14K Lichess games, which average 29 moves.

What is the Blackmar-Diemer Gambit: Diemer-Rosenberg Attack win rate at 1200-1399?

At 1200-1399, White wins 48.7%, draws 2.8% and loses 48.5%. Counting a draw as half a point, that is an Expected Score of 50.1%. It rests on 18K Lichess games, which average 31 moves.

What is the Blackmar-Diemer Gambit: Diemer-Rosenberg Attack win rate at 1400-1599?

At 1400-1599, White wins 48.0%, draws 3.0% and loses 49.0%. Counting a draw as half a point, that is an Expected Score of 49.5%. It rests on 22K Lichess games, which average 32 moves.

What is the Blackmar-Diemer Gambit: Diemer-Rosenberg Attack win rate at 1600-1799?

At 1600-1799, White wins 48.5%, draws 2.9% and loses 48.6%. Counting a draw as half a point, that is an Expected Score of 50.0%. It rests on 21K Lichess games, which average 33 moves.

What is the Blackmar-Diemer Gambit: Diemer-Rosenberg Attack win rate at 1800-1999?

At 1800-1999, White wins 47.9%, draws 3.6% and loses 48.5%. Counting a draw as half a point, that is an Expected Score of 49.7%. It rests on 16K Lichess games, which average 34 moves.

What is the Blackmar-Diemer Gambit: Diemer-Rosenberg Attack win rate at 2000-2199?

At 2000-2199, White wins 48.2%, draws 3.1% and loses 48.7%. Counting a draw as half a point, that is an Expected Score of 49.8%. It rests on 9.9K Lichess games, which average 34 moves.

What is the Blackmar-Diemer Gambit: Diemer-Rosenberg Attack win rate at 2200-2499?

At 2200-2499, White wins 45.3%, draws 4.2% and loses 50.5%. Counting a draw as half a point, that is an Expected Score of 47.4%. It rests on 2.7K Lichess games, which average 37 moves.

What is the Blackmar-Diemer Gambit: Diemer-Rosenberg Attack win rate in UltraBullet?

In UltraBullet, White wins 52.6%, draws 2.6% and loses 44.9%. Counting a draw as half a point, that is an Expected Score of 53.9%. It rests on 3.6K Lichess games.

What is the Blackmar-Diemer Gambit: Diemer-Rosenberg Attack win rate in Bullet?

In Bullet, White wins 48.8%, draws 2.3% and loses 48.9%. Counting a draw as half a point, that is an Expected Score of 50.0%. It rests on 54K Lichess games.

What is the Blackmar-Diemer Gambit: Diemer-Rosenberg Attack win rate in Blitz?

In Blitz, White wins 47.1%, draws 3.8% and loses 49.2%. Counting a draw as half a point, that is an Expected Score of 49.0%. It rests on 44K Lichess games.

What is the Blackmar-Diemer Gambit: Diemer-Rosenberg Attack win rate in Rapid?

In Rapid, White wins 45.1%, draws 4.0% and loses 50.9%. Counting a draw as half a point, that is an Expected Score of 47.1%. It rests on 12K Lichess games.

What is the Blackmar-Diemer Gambit: Diemer-Rosenberg Attack win rate in Classical?

In Classical, White wins 43.3%, draws 5.7% and loses 51.1%. Counting a draw as half a point, that is an Expected Score of 46.1%. It rests on 448 Lichess games.

Is the Blackmar-Diemer Gambit: Diemer-Rosenberg Attack a good opening?

The Blackmar-Diemer Gambit: Diemer-Rosenberg Attack is about level. Across all ratings, White wins 47.8% of its games and loses 49.1%. It performs best at 1200-1399. Your results depend on your rating, time control, and how well you know the typical plans.