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Blackmar-Diemer Gambit Accepted: Ritter Defense

10K games from Lichess · Updated January 2026

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Analyze this line move by move

Black expected score · All ratings · All speeds

43.6%

35%55%
Floor42.8%

the worst score you would still get, 90% confident. At best 44.4%.

Measured over 10K games at this level and clock.

Tough Sellloses more often than it wins at this level

Black comes out behind here — there are better weapons in the list.

Outcomes for Black

Draw 2.9 · Score = win + ½ of the draws · 10K games

Rank among the families Black can choose here
not ranked — this is a variation, not a family
Games in this context
10K
Best context
46.5% at 2000-2199 Blitz
Worst context
39.5% at 1800-1999 Bullet
Average game length
29 moves
Games that end decisively
97.1%
Draws
2.9%

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.

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 holds about the same all the way up, near 45.4%.

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, Bullet: 45.7% expected score (44 games)
  • 0-999 rating, Blitz: 48.4% expected score (123 games)
  • 0-999 rating, Rapid: 42.0% expected score (42 games)
  • 1000-1199 rating, Bullet: 49.7% expected score (134 games)
  • 1000-1199 rating, Blitz: 39.1% expected score (213 games)
  • 1000-1199 rating, Rapid: 42.9% expected score (69 games)
  • 1200-1399 rating, UltraBullet: 30.0% expected score (1 games)
  • 1200-1399 rating, Bullet: 43.6% expected score (279 games)
  • 1200-1399 rating, Blitz: 44.0% expected score (404 games)
  • 1200-1399 rating, Rapid: 43.9% expected score (146 games)
  • 1200-1399 rating, Classical: 30.0% expected score (1 games)
  • 1400-1599 rating, Bullet: 45.5% expected score (467 games)
  • 1400-1599 rating, Blitz: 44.5% expected score (741 games)
  • 1400-1599 rating, Rapid: 41.1% expected score (217 games)
  • 1400-1599 rating, Classical: 50.0% expected score (4 games)
  • 1600-1799 rating, UltraBullet: 50.0% expected score (2 games)
  • 1600-1799 rating, Bullet: 44.5% expected score (760 games)
  • 1600-1799 rating, Blitz: 45.5% expected score (985 games)
  • 1600-1799 rating, Rapid: 42.8% expected score (296 games)
  • 1600-1799 rating, Classical: 58.0% expected score (11 games)
  • 1800-1999 rating, Bullet: 39.5% expected score (945 games)
  • 1800-1999 rating, Blitz: 44.7% expected score (1,316 games)
  • 1800-1999 rating, Rapid: 43.1% expected score (293 games)
  • 1800-1999 rating, Classical: 39.5% expected score (8 games)
  • 2000-2199 rating, Bullet: 41.8% expected score (848 games)
  • 2000-2199 rating, Blitz: 46.5% expected score (787 games)
  • 2000-2199 rating, Rapid: 43.6% expected score (99 games)
  • 2000-2199 rating, Classical: 50.0% expected score (1 games)
  • 2200-2499 rating, UltraBullet: 70.0% expected score (1 games)
  • 2200-2499 rating, Bullet: 39.9% expected score (537 games)
  • 2200-2499 rating, Blitz: 40.8% expected score (166 games)
  • 2200-2499 rating, Rapid: 45.8% expected score (22 games)
  • 2500+ rating, Bullet: 46.7% expected score (89 games)
  • 2500+ rating, Blitz: 44.7% expected score (8 games)

Related Openings

Parent
Blackmar-Diemer Gambit Accepted
50.9%
Variations (5)
Blackmar-Diemer Gambit Accepted: Ryder Gambit
54.2%
Blackmar-Diemer Gambit Accepted: Teichmann Defense
53.2%
Blackmar-Diemer Gambit Accepted: Euwe Defense
58.8%
Blackmar-Diemer Gambit Accepted: Ziegler Defense
55.2%
Blackmar-Diemer Gambit Accepted: Pietrowsky Defense
53.4%
Analyze Blackmar-Diemer Gambit Accepted: Ritter Defense PositionsSee what each move is worth at your rating, move by move

Methodology

Across every rating and clock, the Blackmar-Diemer Gambit Accepted: Ritter Defense scores 43.6% for Black — we are 90% confident the real figure is between 42.8% and 44.4% — from 10K 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
10K+ 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 Accepted: Ritter Defense win rate?

Playing the Blackmar-Diemer Gambit Accepted: Ritter Defense, Black wins 42.1%, draws 2.9% and loses 55.0%. Counting a draw as half a point, that is an Expected Score of 43.6%. It rests on 10K rated games from Lichess.

At what rating does the Blackmar-Diemer Gambit Accepted: Ritter Defense perform best?

The Blackmar-Diemer Gambit Accepted: Ritter Defense performs best for Black at 1600-1799, with an Expected Score of 44.8% (2.1K games) and the highest Floor of any rating with enough games to read.

Is the Blackmar-Diemer Gambit Accepted: Ritter Defense better in blitz or rapid?

For Black, the Blackmar-Diemer Gambit Accepted: Ritter Defense scores higher in Blitz: an Expected Score of 44.8% in Blitz (4.7K games) against 42.7% in Rapid (1.2K games).

How sharp is the Blackmar-Diemer Gambit Accepted: Ritter Defense?

The Blackmar-Diemer Gambit Accepted: Ritter Defense has a sharpness score of 97.1 (very decisive), meaning 97.1% of games end decisively. Average game length is 29 moves.

What is the Blackmar-Diemer Gambit Accepted: Ritter Defense win rate at 0-999?

At 0-999, Black wins 43.9%, draws 5.0% and loses 51.1%. Counting a draw as half a point, that is an Expected Score of 46.4%. It rests on 209 Lichess games, which average 28 moves.

What is the Blackmar-Diemer Gambit Accepted: Ritter Defense win rate at 1000-1199?

At 1000-1199, Black wins 41.3%, draws 3.5% and loses 55.2%. Counting a draw as half a point, that is an Expected Score of 43.1%. It rests on 416 Lichess games, which average 27 moves.

What is the Blackmar-Diemer Gambit Accepted: Ritter Defense win rate at 1200-1399?

At 1200-1399, Black wins 42.6%, draws 2.2% and loses 55.2%. Counting a draw as half a point, that is an Expected Score of 43.7%. It rests on 831 Lichess games, which average 27 moves.

What is the Blackmar-Diemer Gambit Accepted: Ritter Defense win rate at 1400-1599?

At 1400-1599, Black wins 43.1%, draws 2.4% and loses 54.5%. Counting a draw as half a point, that is an Expected Score of 44.3%. It rests on 1.4K Lichess games, which average 27 moves.

What is the Blackmar-Diemer Gambit Accepted: Ritter Defense win rate at 1600-1799?

At 1600-1799, Black wins 43.6%, draws 2.5% and loses 54.0%. Counting a draw as half a point, that is an Expected Score of 44.8%. It rests on 2.1K Lichess games, which average 29 moves.

What is the Blackmar-Diemer Gambit Accepted: Ritter Defense win rate at 1800-1999?

At 1800-1999, Black wins 40.7%, draws 3.6% and loses 55.6%. Counting a draw as half a point, that is an Expected Score of 42.6%. It rests on 2.6K Lichess games, which average 30 moves.

What is the Blackmar-Diemer Gambit Accepted: Ritter Defense win rate at 2000-2199?

At 2000-2199, Black wins 42.5%, draws 3.0% and loses 54.5%. Counting a draw as half a point, that is an Expected Score of 44.0%. It rests on 1.7K Lichess games, which average 31 moves.

What is the Blackmar-Diemer Gambit Accepted: Ritter Defense win rate at 2200-2499?

At 2200-2499, Black wins 38.7%, draws 3.2% and loses 58.1%. Counting a draw as half a point, that is an Expected Score of 40.3%. It rests on 726 Lichess games, which average 31 moves.

What is the Blackmar-Diemer Gambit Accepted: Ritter Defense win rate in Bullet?

In Bullet, Black wins 41.2%, draws 2.4% and loses 56.3%. Counting a draw as half a point, that is an Expected Score of 42.5%. It rests on 4.1K Lichess games.

What is the Blackmar-Diemer Gambit Accepted: Ritter Defense win rate in Blitz?

In Blitz, Black wins 43.2%, draws 3.2% and loses 53.7%. Counting a draw as half a point, that is an Expected Score of 44.8%. It rests on 4.7K Lichess games.

What is the Blackmar-Diemer Gambit Accepted: Ritter Defense win rate in Rapid?

In Rapid, Black wins 40.8%, draws 3.8% and loses 55.4%. Counting a draw as half a point, that is an Expected Score of 42.7%. It rests on 1.2K Lichess games.

Is the Blackmar-Diemer Gambit Accepted: Ritter Defense a good opening?

The Blackmar-Diemer Gambit Accepted: Ritter Defense is hard work for Black — it favours White. Across all ratings, Black wins 42.1% of its games and loses 55.0%. It performs best at 1600-1799. Your results depend on your rating, time control, and how well you know the typical plans.