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Blackmar-Diemer Gambit Declined: Brombacher Countergambit

39K games from Lichess · Updated January 2026

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Analyze this line move by move

Black expected score · All ratings · All speeds

50.4%

45%55%
Floor50.0%

the worst score you would still get, 90% confident. At best 50.8%.

Measured over 39K 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 Black

Draw 4.5 · Score = win + ½ of the draws · 39K games

Rank among the families Black can choose here
not ranked — this is a variation, not a family
Games in this context
39K
Best context
57.3% at 1200-1399 Blitz
Worst context
45.9% at 2500+ Bullet
Average game length
33 moves
Games that end decisively
95.5%
Draws
4.5%

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 BreakpointBlack

Peak: +4.5% · Breakpoint: 1800-1999

Where it holds · Black score by rating × clock

Green is clearly ahead for Black, grey is around even, red is behind. Tap a cell to measure there, and again to clear. It falls away as the rating rises: 57.5% at 0-999, 39.0% 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: 70.0% expected score (1 games)
  • 0-999 rating, Bullet: 55.5% expected score (146 games)
  • 0-999 rating, Blitz: 58.2% expected score (267 games)
  • 0-999 rating, Rapid: 53.6% expected score (110 games)
  • 0-999 rating, Classical: 50.0% expected score (2 games)
  • 1000-1199 rating, UltraBullet: 30.0% expected score (1 games)
  • 1000-1199 rating, Bullet: 49.7% expected score (276 games)
  • 1000-1199 rating, Blitz: 52.9% expected score (439 games)
  • 1000-1199 rating, Rapid: 57.0% expected score (243 games)
  • 1000-1199 rating, Classical: 50.0% expected score (4 games)
  • 1200-1399 rating, UltraBullet: 61.2% expected score (3 games)
  • 1200-1399 rating, Bullet: 54.7% expected score (497 games)
  • 1200-1399 rating, Blitz: 57.3% expected score (708 games)
  • 1200-1399 rating, Rapid: 55.9% expected score (323 games)
  • 1200-1399 rating, Classical: 50.0% expected score (10 games)
  • 1400-1599 rating, UltraBullet: 54.3% expected score (22 games)
  • 1400-1599 rating, Bullet: 54.7% expected score (850 games)
  • 1400-1599 rating, Blitz: 52.1% expected score (1,218 games)
  • 1400-1599 rating, Rapid: 52.8% expected score (527 games)
  • 1400-1599 rating, Classical: 53.4% expected score (28 games)
  • 1600-1799 rating, UltraBullet: 52.3% expected score (42 games)
  • 1600-1799 rating, Bullet: 52.9% expected score (1,566 games)
  • 1600-1799 rating, Blitz: 53.4% expected score (2,248 games)
  • 1600-1799 rating, Rapid: 50.8% expected score (775 games)
  • 1600-1799 rating, Classical: 58.0% expected score (36 games)
  • 1800-1999 rating, UltraBullet: 58.0% expected score (30 games)
  • 1800-1999 rating, Bullet: 50.9% expected score (2,756 games)
  • 1800-1999 rating, Blitz: 49.3% expected score (4,794 games)
  • 1800-1999 rating, Rapid: 56.5% expected score (1,009 games)
  • 1800-1999 rating, Classical: 60.1% expected score (43 games)
  • 2000-2199 rating, UltraBullet: 36.9% expected score (29 games)
  • 2000-2199 rating, Bullet: 49.9% expected score (3,936 games)
  • 2000-2199 rating, Blitz: 49.2% expected score (5,747 games)
  • 2000-2199 rating, Rapid: 52.3% expected score (899 games)
  • 2000-2199 rating, Classical: 45.7% expected score (33 games)
  • 2200-2499 rating, UltraBullet: 39.4% expected score (22 games)
  • 2200-2499 rating, Bullet: 48.5% expected score (4,614 games)
  • 2200-2499 rating, Blitz: 48.0% expected score (2,932 games)
  • 2200-2499 rating, Rapid: 41.4% expected score (346 games)
  • 2200-2499 rating, Classical: 40.9% expected score (4 games)
  • 2500+ rating, UltraBullet: 29.0% expected score (8 games)
  • 2500+ rating, Bullet: 45.9% expected score (1,322 games)
  • 2500+ rating, Blitz: 39.8% expected score (351 games)
  • 2500+ rating, Rapid: 41.3% expected score (10 games)

Related Openings

Variations (5)
Blackmar-Diemer Gambit Declined: Vienna Defense
49.4%
Blackmar-Diemer Gambit Declined: Weinsbach Defense
55.1%
Blackmar-Diemer Gambit Declined: O'Kelly Defense
53.2%
Blackmar-Diemer Gambit Declined: Lamb Defense
47.6%
Blackmar-Diemer Gambit Declined: Langeheinicke Defense
49.4%
Analyze Blackmar-Diemer Gambit Declined: Brombacher Countergambit PositionsSee what each move is worth at your rating, move by move

Methodology

Across every rating and clock, the Blackmar-Diemer Gambit Declined: Brombacher Countergambit scores 50.4% for Black — we are 90% confident the real figure is between 50.0% and 50.8% — from 39K 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
39K+ 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 Declined: Brombacher Countergambit win rate?

Playing the Blackmar-Diemer Gambit Declined: Brombacher Countergambit, Black wins 48.1%, draws 4.5% and loses 47.4%. Counting a draw as half a point, that is an Expected Score of 50.4%. It rests on 39K rated games from Lichess.

At what rating does the Blackmar-Diemer Gambit Declined: Brombacher Countergambit perform best?

The Blackmar-Diemer Gambit Declined: Brombacher Countergambit performs best for Black at 1200-1399, with an Expected Score of 56.1% (1.5K games) and the highest Floor of any rating with enough games to read.

Is the Blackmar-Diemer Gambit Declined: Brombacher Countergambit better in blitz or rapid?

For Black, the Blackmar-Diemer Gambit Declined: Brombacher Countergambit scores higher in Rapid: an Expected Score of 50.1% in Blitz (19K games) against 52.7% in Rapid (4.2K games).

How sharp is the Blackmar-Diemer Gambit Declined: Brombacher Countergambit?

The Blackmar-Diemer Gambit Declined: Brombacher Countergambit has a sharpness score of 95.5 (very decisive), meaning 95.5% of games end decisively. Average game length is 33 moves.

What is the Blackmar-Diemer Gambit Declined: Brombacher Countergambit win rate at 0-999?

At 0-999, Black wins 54.9%, draws 3.3% and loses 41.8%. Counting a draw as half a point, that is an Expected Score of 56.6%. It rests on 526 Lichess games, which average 27 moves.

What is the Blackmar-Diemer Gambit Declined: Brombacher Countergambit win rate at 1000-1199?

At 1000-1199, Black wins 51.1%, draws 3.7% and loses 45.3%. Counting a draw as half a point, that is an Expected Score of 52.9%. It rests on 963 Lichess games, which average 28 moves.

What is the Blackmar-Diemer Gambit Declined: Brombacher Countergambit win rate at 1200-1399?

At 1200-1399, Black wins 54.5%, draws 3.2% and loses 42.3%. Counting a draw as half a point, that is an Expected Score of 56.1%. It rests on 1.5K Lichess games, which average 29 moves.

What is the Blackmar-Diemer Gambit Declined: Brombacher Countergambit win rate at 1400-1599?

At 1400-1599, Black wins 51.5%, draws 3.1% and loses 45.4%. Counting a draw as half a point, that is an Expected Score of 53.1%. It rests on 2.6K Lichess games, which average 29 moves.

What is the Blackmar-Diemer Gambit Declined: Brombacher Countergambit win rate at 1600-1799?

At 1600-1799, Black wins 51.4%, draws 2.8% and loses 45.8%. Counting a draw as half a point, that is an Expected Score of 52.8%. It rests on 4.7K Lichess games, which average 30 moves.

What is the Blackmar-Diemer Gambit Declined: Brombacher Countergambit win rate at 1800-1999?

At 1800-1999, Black wins 48.5%, draws 4.4% and loses 47.1%. Counting a draw as half a point, that is an Expected Score of 50.7%. It rests on 8.6K Lichess games, which average 32 moves.

What is the Blackmar-Diemer Gambit Declined: Brombacher Countergambit win rate at 2000-2199?

At 2000-2199, Black wins 47.0%, draws 5.2% and loses 47.7%. Counting a draw as half a point, that is an Expected Score of 49.7%. It rests on 11K Lichess games, which average 34 moves.

What is the Blackmar-Diemer Gambit Declined: Brombacher Countergambit win rate at 2200-2499?

At 2200-2499, Black wins 45.3%, draws 5.3% and loses 49.4%. Counting a draw as half a point, that is an Expected Score of 48.0%. It rests on 7.9K Lichess games, which average 35 moves.

What is the Blackmar-Diemer Gambit Declined: Brombacher Countergambit win rate at 2500+?

At 2500+, Black wins 41.8%, draws 5.3% and loses 52.9%. Counting a draw as half a point, that is an Expected Score of 44.5%. It rests on 1.7K Lichess games, which average 39 moves.

What is the Blackmar-Diemer Gambit Declined: Brombacher Countergambit win rate in UltraBullet?

In UltraBullet, Black wins 45.5%, draws 4.7% and loses 49.8%. Counting a draw as half a point, that is an Expected Score of 47.9%. It rests on 158 Lichess games.

What is the Blackmar-Diemer Gambit Declined: Brombacher Countergambit win rate in Bullet?

In Bullet, Black wins 48.4%, draws 3.4% and loses 48.2%. Counting a draw as half a point, that is an Expected Score of 50.1%. It rests on 16K Lichess games.

What is the Blackmar-Diemer Gambit Declined: Brombacher Countergambit win rate in Blitz?

In Blitz, Black wins 47.4%, draws 5.3% and loses 47.3%. Counting a draw as half a point, that is an Expected Score of 50.1%. It rests on 19K Lichess games.

What is the Blackmar-Diemer Gambit Declined: Brombacher Countergambit win rate in Rapid?

In Rapid, Black wins 50.2%, draws 5.1% and loses 44.8%. Counting a draw as half a point, that is an Expected Score of 52.7%. It rests on 4.2K Lichess games.

What is the Blackmar-Diemer Gambit Declined: Brombacher Countergambit win rate in Classical?

In Classical, Black wins 50.5%, draws 7.1% and loses 42.4%. Counting a draw as half a point, that is an Expected Score of 54.1%. It rests on 160 Lichess games.

Is the Blackmar-Diemer Gambit Declined: Brombacher Countergambit a good opening?

The Blackmar-Diemer Gambit Declined: Brombacher Countergambit is about level. Across all ratings, Black wins 48.1% of its games and loses 47.4%. It performs best at 1200-1399. Your results depend on your rating, time control, and how well you know the typical plans.