Blackmar-Diemer Gambit: Lemberger Countergambit, Rasmussen Attack
4.6K games from Lichess · Updated January 2026
White expected score · All ratings · All speeds
55.5%
the worst score you would still get, 90% confident. At best 56.7%.
Measured over 4.6K games at this level and clock.
A strong choice for White at this level and clock.
Outcomes for White
Draw 5.2 · Score = win + ½ of the draws · 4.6K games
- Rank among the families White can choose here
- not ranked — this is a variation, not a family
- Games in this context
- 4.6K
- Best context
- 60.3% at 2000-2199 Blitz
- Worst context
- 53.4% at 1800-1999 Blitz
- Average game length
- 34 moves
- Games that end decisively
- 94.8%
- Draws
- 5.2%
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
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 holds about the same all the way up, near 52.9%.
| Rating | UB | Bulle | Blitz | Rapid | Class |
|---|---|---|---|---|---|
| 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, Bullet: 38.9% expected score (21 games)
- 0-999 rating, Blitz: 57.4% expected score (80 games)
- 0-999 rating, Rapid: 62.4% expected score (39 games)
- 1000-1199 rating, UltraBullet: 30.0% expected score (1 games)
- 1000-1199 rating, Bullet: 50.0% expected score (34 games)
- 1000-1199 rating, Blitz: 54.3% expected score (80 games)
- 1000-1199 rating, Rapid: 51.2% expected score (43 games)
- 1200-1399 rating, UltraBullet: 83.4% expected score (3 games)
- 1200-1399 rating, Bullet: 45.8% expected score (57 games)
- 1200-1399 rating, Blitz: 46.9% expected score (95 games)
- 1200-1399 rating, Rapid: 58.6% expected score (51 games)
- 1200-1399 rating, Classical: 57.7% expected score (5 games)
- 1400-1599 rating, UltraBullet: 16.7% expected score (3 games)
- 1400-1599 rating, Bullet: 50.7% expected score (142 games)
- 1400-1599 rating, Blitz: 55.7% expected score (166 games)
- 1400-1599 rating, Rapid: 49.4% expected score (77 games)
- 1400-1599 rating, Classical: 38.9% expected score (3 games)
- 1600-1799 rating, UltraBullet: 39.5% expected score (8 games)
- 1600-1799 rating, Bullet: 48.9% expected score (217 games)
- 1600-1799 rating, Blitz: 55.5% expected score (228 games)
- 1600-1799 rating, Rapid: 57.8% expected score (75 games)
- 1600-1799 rating, Classical: 50.0% expected score (2 games)
- 1800-1999 rating, UltraBullet: 16.7% expected score (3 games)
- 1800-1999 rating, Bullet: 56.0% expected score (383 games)
- 1800-1999 rating, Blitz: 53.4% expected score (543 games)
- 1800-1999 rating, Rapid: 61.6% expected score (137 games)
- 1800-1999 rating, Classical: 65.4% expected score (5 games)
- 2000-2199 rating, Bullet: 52.6% expected score (346 games)
- 2000-2199 rating, Blitz: 60.3% expected score (513 games)
- 2000-2199 rating, Rapid: 61.8% expected score (92 games)
- 2000-2199 rating, Classical: 70.0% expected score (1 games)
- 2200-2499 rating, Bullet: 57.0% expected score (540 games)
- 2200-2499 rating, Blitz: 57.8% expected score (261 games)
- 2200-2499 rating, Rapid: 70.8% expected score (49 games)
- 2500+ rating, Bullet: 56.4% expected score (282 games)
- 2500+ rating, Blitz: 50.0% expected score (12 games)
Related Openings
Methodology
Across every rating and clock, the Blackmar-Diemer Gambit: Lemberger Countergambit, Rasmussen Attack scores 55.5% for White — we are 90% confident the real figure is between 54.3% and 56.7% — from 4.6K 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
- 4.6K+ 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: Lemberger Countergambit, Rasmussen Attack win rate?
Playing the Blackmar-Diemer Gambit: Lemberger Countergambit, Rasmussen Attack, White wins 52.9%, draws 5.2% and loses 41.9%. Counting a draw as half a point, that is an Expected Score of 55.5%. It rests on 4.6K rated games from Lichess.
At what rating does the Blackmar-Diemer Gambit: Lemberger Countergambit, Rasmussen Attack perform best?
The Blackmar-Diemer Gambit: Lemberger Countergambit, Rasmussen Attack performs best for White at 2200-2499, with an Expected Score of 58.1% (850 games) and the highest Floor of any rating with enough games to read.
Is the Blackmar-Diemer Gambit: Lemberger Countergambit, Rasmussen Attack better in blitz or rapid?
For White, the Blackmar-Diemer Gambit: Lemberger Countergambit, Rasmussen Attack scores higher in Rapid: an Expected Score of 56.1% in Blitz (2.0K games) against 59.4% in Rapid (563 games).
How sharp is the Blackmar-Diemer Gambit: Lemberger Countergambit, Rasmussen Attack?
The Blackmar-Diemer Gambit: Lemberger Countergambit, Rasmussen Attack has a sharpness score of 94.8 (decisive), meaning 94.8% of games end decisively. Average game length is 34 moves.
What is the Blackmar-Diemer Gambit: Lemberger Countergambit, Rasmussen Attack win rate at 0-999?
At 0-999, White wins 54.8%, draws 2.5% and loses 42.8%. Counting a draw as half a point, that is an Expected Score of 56.0%. It rests on 140 Lichess games, which average 26 moves.
What is the Blackmar-Diemer Gambit: Lemberger Countergambit, Rasmussen Attack win rate at 1000-1199?
At 1000-1199, White wins 49.8%, draws 4.7% and loses 45.5%. Counting a draw as half a point, that is an Expected Score of 52.2%. It rests on 158 Lichess games, which average 29 moves.
What is the Blackmar-Diemer Gambit: Lemberger Countergambit, Rasmussen Attack win rate at 1200-1399?
At 1200-1399, White wins 49.2%, draws 2.6% and loses 48.2%. Counting a draw as half a point, that is an Expected Score of 50.5%. It rests on 211 Lichess games, which average 31 moves.
What is the Blackmar-Diemer Gambit: Lemberger Countergambit, Rasmussen Attack win rate at 1400-1599?
At 1400-1599, White wins 50.3%, draws 3.4% and loses 46.2%. Counting a draw as half a point, that is an Expected Score of 52.1%. It rests on 391 Lichess games, which average 31 moves.
What is the Blackmar-Diemer Gambit: Lemberger Countergambit, Rasmussen Attack win rate at 1600-1799?
At 1600-1799, White wins 50.9%, draws 3.9% and loses 45.2%. Counting a draw as half a point, that is an Expected Score of 52.9%. It rests on 530 Lichess games, which average 33 moves.
What is the Blackmar-Diemer Gambit: Lemberger Countergambit, Rasmussen Attack win rate at 1800-1999?
At 1800-1999, White wins 52.8%, draws 5.0% and loses 42.2%. Counting a draw as half a point, that is an Expected Score of 55.3%. It rests on 1.1K Lichess games, which average 34 moves.
What is the Blackmar-Diemer Gambit: Lemberger Countergambit, Rasmussen Attack win rate at 2000-2199?
At 2000-2199, White wins 54.9%, draws 5.6% and loses 39.5%. Counting a draw as half a point, that is an Expected Score of 57.7%. It rests on 952 Lichess games, which average 36 moves.
What is the Blackmar-Diemer Gambit: Lemberger Countergambit, Rasmussen Attack win rate at 2200-2499?
At 2200-2499, White wins 54.2%, draws 7.8% and loses 38.0%. Counting a draw as half a point, that is an Expected Score of 58.1%. It rests on 850 Lichess games, which average 38 moves.
What is the Blackmar-Diemer Gambit: Lemberger Countergambit, Rasmussen Attack win rate at 2500+?
At 2500+, White wins 53.0%, draws 6.3% and loses 40.8%. Counting a draw as half a point, that is an Expected Score of 56.1%. It rests on 294 Lichess games, which average 40 moves.
What is the Blackmar-Diemer Gambit: Lemberger Countergambit, Rasmussen Attack win rate in Bullet?
In Bullet, White wins 52.0%, draws 4.0% and loses 44.0%. Counting a draw as half a point, that is an Expected Score of 54.0%. It rests on 2.0K Lichess games.
What is the Blackmar-Diemer Gambit: Lemberger Countergambit, Rasmussen Attack win rate in Blitz?
In Blitz, White wins 52.8%, draws 6.5% and loses 40.6%. Counting a draw as half a point, that is an Expected Score of 56.1%. It rests on 2.0K Lichess games.
What is the Blackmar-Diemer Gambit: Lemberger Countergambit, Rasmussen Attack win rate in Rapid?
In Rapid, White wins 57.0%, draws 4.9% and loses 38.2%. Counting a draw as half a point, that is an Expected Score of 59.4%. It rests on 563 Lichess games.
Is the Blackmar-Diemer Gambit: Lemberger Countergambit, Rasmussen Attack a good opening?
The Blackmar-Diemer Gambit: Lemberger Countergambit, Rasmussen Attack is good for White. Across all ratings, White wins 52.9% of its games and loses 41.9%. It performs best at 2200-2499. Your results depend on your rating, time control, and how well you know the typical plans.