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Blackmar-Diemer Gambit Accepted: Pietrowsky Defense

184K games from Lichess · Updated January 2026

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Analyze this line move by move

Black expected score · All ratings · All speeds

45.0%

40%55%
Floor44.9%

the worst score you would still get, 90% confident. At best 45.2%.

Measured over 184K 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 3.2 · Score = win + ½ of the draws · 184K games

Rank among the families Black can choose here
not ranked — this is a variation, not a family
Games in this context
184K
Best context
48.6% at 0-999 Rapid
Worst context
43.9% at 1200-1399 Bullet
Average game length
29 moves
Games that end decisively
96.8%
Draws
3.2%

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

Time-Control Swing

Max swing: 10.1% · UltraBullet best · Blitz worst

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 42.8%.

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: 27.0% expected score (5 games)
  • 0-999 rating, Bullet: 46.9% expected score (3,544 games)
  • 0-999 rating, Blitz: 47.3% expected score (5,677 games)
  • 0-999 rating, Rapid: 48.6% expected score (1,964 games)
  • 0-999 rating, Classical: 44.2% expected score (7 games)
  • 1000-1199 rating, UltraBullet: 45.3% expected score (9 games)
  • 1000-1199 rating, Bullet: 44.7% expected score (7,024 games)
  • 1000-1199 rating, Blitz: 45.1% expected score (11,329 games)
  • 1000-1199 rating, Rapid: 45.2% expected score (5,086 games)
  • 1000-1199 rating, Classical: 32.6% expected score (30 games)
  • 1200-1399 rating, UltraBullet: 29.8% expected score (38 games)
  • 1200-1399 rating, Bullet: 43.9% expected score (10,309 games)
  • 1200-1399 rating, Blitz: 44.6% expected score (15,266 games)
  • 1200-1399 rating, Rapid: 44.0% expected score (8,119 games)
  • 1200-1399 rating, Classical: 41.2% expected score (129 games)
  • 1400-1599 rating, UltraBullet: 30.2% expected score (74 games)
  • 1400-1599 rating, Bullet: 44.2% expected score (11,750 games)
  • 1400-1599 rating, Blitz: 45.6% expected score (17,515 games)
  • 1400-1599 rating, Rapid: 44.3% expected score (9,620 games)
  • 1400-1599 rating, Classical: 39.1% expected score (268 games)
  • 1600-1799 rating, UltraBullet: 41.6% expected score (82 games)
  • 1600-1799 rating, Bullet: 44.2% expected score (13,069 games)
  • 1600-1799 rating, Blitz: 45.9% expected score (13,378 games)
  • 1600-1799 rating, Rapid: 45.3% expected score (7,502 games)
  • 1600-1799 rating, Classical: 39.3% expected score (288 games)
  • 1800-1999 rating, UltraBullet: 54.2% expected score (34 games)
  • 1800-1999 rating, Bullet: 44.7% expected score (12,073 games)
  • 1800-1999 rating, Blitz: 46.6% expected score (9,224 games)
  • 1800-1999 rating, Rapid: 45.2% expected score (3,474 games)
  • 1800-1999 rating, Classical: 40.4% expected score (118 games)
  • 2000-2199 rating, UltraBullet: 33.1% expected score (25 games)
  • 2000-2199 rating, Bullet: 44.4% expected score (8,442 games)
  • 2000-2199 rating, Blitz: 48.5% expected score (2,888 games)
  • 2000-2199 rating, Rapid: 46.9% expected score (639 games)
  • 2000-2199 rating, Classical: 35.7% expected score (23 games)
  • 2200-2499 rating, UltraBullet: 32.4% expected score (7 games)
  • 2200-2499 rating, Bullet: 44.5% expected score (4,084 games)
  • 2200-2499 rating, Blitz: 48.8% expected score (362 games)
  • 2200-2499 rating, Rapid: 52.8% expected score (52 games)
  • 2500+ rating, UltraBullet: 30.0% expected score (1 games)
  • 2500+ rating, Bullet: 43.6% expected score (457 games)
  • 2500+ rating, Blitz: 50.0% expected score (10 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: Gunderam Defense
46.8%
Analyze Blackmar-Diemer Gambit Accepted: Pietrowsky Defense PositionsSee what each move is worth at your rating, move by move

Methodology

Across every rating and clock, the Blackmar-Diemer Gambit Accepted: Pietrowsky Defense scores 45.0% for Black — we are 90% confident the real figure is between 44.9% and 45.2% — from 184K 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
184K+ 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: Pietrowsky Defense win rate?

Playing the Blackmar-Diemer Gambit Accepted: Pietrowsky Defense, Black wins 43.4%, draws 3.2% and loses 53.4%. Counting a draw as half a point, that is an Expected Score of 45.0%. It rests on 184K rated games from Lichess.

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

The Blackmar-Diemer Gambit Accepted: Pietrowsky Defense performs best for Black at 0-999, with an Expected Score of 47.4% (11K games) and the highest Floor of any rating with enough games to read.

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

For Black, the Blackmar-Diemer Gambit Accepted: Pietrowsky Defense scores about the same in both: an Expected Score of 45.7% in Blitz (76K games) against 44.9% in Rapid (36K games).

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

The Blackmar-Diemer Gambit Accepted: Pietrowsky Defense has a sharpness score of 96.8 (very decisive), meaning 96.8% of games end decisively. Average game length is 29 moves.

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

At 0-999, Black wins 45.6%, draws 3.4% and loses 50.9%. Counting a draw as half a point, that is an Expected Score of 47.4%. It rests on 11K Lichess games, which average 26 moves.

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

At 1000-1199, Black wins 43.4%, draws 3.1% and loses 53.5%. Counting a draw as half a point, that is an Expected Score of 45.0%. It rests on 23K Lichess games, which average 27 moves.

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

At 1200-1399, Black wins 42.7%, draws 3.0% and loses 54.3%. Counting a draw as half a point, that is an Expected Score of 44.2%. It rests on 34K Lichess games, which average 28 moves.

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

At 1400-1599, Black wins 43.3%, draws 2.9% and loses 53.8%. Counting a draw as half a point, that is an Expected Score of 44.8%. It rests on 39K Lichess games, which average 28 moves.

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

At 1600-1799, Black wins 43.4%, draws 3.2% and loses 53.4%. Counting a draw as half a point, that is an Expected Score of 45.0%. It rests on 34K Lichess games, which average 30 moves.

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

At 1800-1999, Black wins 43.8%, draws 3.3% and loses 52.9%. Counting a draw as half a point, that is an Expected Score of 45.5%. It rests on 25K Lichess games, which average 31 moves.

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

At 2000-2199, Black wins 43.7%, draws 3.4% and loses 52.8%. Counting a draw as half a point, that is an Expected Score of 45.5%. It rests on 12K Lichess games, which average 32 moves.

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

At 2200-2499, Black wins 42.6%, draws 4.5% and loses 52.9%. Counting a draw as half a point, that is an Expected Score of 44.9%. It rests on 4.5K Lichess games, which average 34 moves.

What is the Blackmar-Diemer Gambit Accepted: Pietrowsky Defense win rate at 2500+?

At 2500+, Black wins 40.4%, draws 6.5% and loses 53.1%. Counting a draw as half a point, that is an Expected Score of 43.7%. It rests on 468 Lichess games, which average 39 moves.

What is the Blackmar-Diemer Gambit Accepted: Pietrowsky Defense win rate in UltraBullet?

In UltraBullet, Black wins 36.0%, draws 1.3% and loses 62.7%. Counting a draw as half a point, that is an Expected Score of 36.7%. It rests on 275 Lichess games.

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

In Bullet, Black wins 43.1%, draws 2.6% and loses 54.2%. Counting a draw as half a point, that is an Expected Score of 44.5%. It rests on 71K Lichess games.

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

In Blitz, Black wins 44.0%, draws 3.4% and loses 52.6%. Counting a draw as half a point, that is an Expected Score of 45.7%. It rests on 76K Lichess games.

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

In Rapid, Black wins 43.0%, draws 3.7% and loses 53.3%. Counting a draw as half a point, that is an Expected Score of 44.9%. It rests on 36K Lichess games.

What is the Blackmar-Diemer Gambit Accepted: Pietrowsky Defense win rate in Classical?

In Classical, Black wins 37.1%, draws 4.3% and loses 58.6%. Counting a draw as half a point, that is an Expected Score of 39.3%. It rests on 863 Lichess games.

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

The Blackmar-Diemer Gambit Accepted: Pietrowsky Defense is hard work for Black — it favours White. Across all ratings, Black wins 43.4% of its games and loses 53.4%. It performs best at 0-999. Your results depend on your rating, time control, and how well you know the typical plans.