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Blackmar-Diemer Gambit Declined: Lamb Defense

171K games from Lichess · Updated January 2026

Playable
White Expected Score49.7%Range (90% confident): 49.5% – 49.9%Based on 171K games
0%49.7%100%
Range (90% confident): 49.5% – 49.9%
Outcome Distribution
47.6%4.0%48.3%
Win
Draw
Loss
4...Nc6
Blackmar-Diemer Gambit Declined: Lamb Defense
Analyzen=171K
Avg Length31 moves
Sharpness96%
Draw Rate4.0%

What is the Blackmar-Diemer Gambit Declined: Lamb Defense expected score for White?

Snapshot

At all ratings, the Blackmar-Diemer Gambit Declined: Lamb Defense has a 49.7% expected score for White (we're 90% confident it's between 49.5% and 49.9%), based on 171K Lichess games.

Extra Analysis

Deep-dive datasets for this opening

Gambit BreakpointWhite

Peak: +5.3% · Breakpoint: 0-999

Traps & Chaos

Complexity: 90.2 · Trap factor: +2.1 · n=171K

Time-Control Swing

Max swing: 12.2% · UltraBullet best · Classical worst

White Win% by Rating

Improves with rating: 44% → 47%

0
1000
1200
1400
1600
1800
2000
2200
2500+

  • 0-999: 43.7% win rate (23,578 games)
  • 1000-1199: 46.9% win rate (29,321 games)
  • 1200-1399: 48.3% win rate (30,355 games)
  • 1400-1599: 47.7% win rate (30,247 games)
  • 1600-1799: 48.0% win rate (26,281 games)
  • 1800-1999: 49.7% win rate (17,986 games)
  • 2000-2199: 51.4% win rate (9,259 games)
  • 2200-2499: 51.4% win rate (3,185 games)
  • 2500+: 47.3% win rate (357 games)

White Win% by Time Control

Best in UltraBullet (56%), worst in Classical (44%)

UltraBullet
Bullet
Blitz
Rapid
Classical

  • UltraBullet: 56.1% win rate (358 games)
  • Bullet: 50.1% win rate (50,157 games)
  • Blitz: 47.2% win rate (76,219 games)
  • Rapid: 45.7% win rate (42,390 games)
  • Classical: 43.9% win rate (1,445 games)

White% by Rating × Time Control

Click any cell to filter. Green = above 50%, Red = below 50%.

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: 73.1% expected score (5 games)
  • 0-999 rating, Bullet: 47.2% expected score (3,998 games)
  • 0-999 rating, Blitz: 46.5% expected score (12,807 games)
  • 0-999 rating, Rapid: 45.6% expected score (6,703 games)
  • 0-999 rating, Classical: 44.0% expected score (65 games)
  • 1000-1199 rating, UltraBullet: 54.1% expected score (35 games)
  • 1000-1199 rating, Bullet: 50.2% expected score (6,251 games)
  • 1000-1199 rating, Blitz: 49.8% expected score (14,143 games)
  • 1000-1199 rating, Rapid: 47.4% expected score (8,666 games)
  • 1000-1199 rating, Classical: 44.5% expected score (226 games)
  • 1200-1399 rating, UltraBullet: 66.4% expected score (69 games)
  • 1200-1399 rating, Bullet: 52.3% expected score (8,255 games)
  • 1200-1399 rating, Blitz: 49.6% expected score (13,256 games)
  • 1200-1399 rating, Rapid: 49.0% expected score (8,468 games)
  • 1200-1399 rating, Classical: 46.0% expected score (307 games)
  • 1400-1599 rating, UltraBullet: 51.2% expected score (82 games)
  • 1400-1599 rating, Bullet: 50.9% expected score (8,435 games)
  • 1400-1599 rating, Blitz: 50.2% expected score (13,770 games)
  • 1400-1599 rating, Rapid: 46.8% expected score (7,553 games)
  • 1400-1599 rating, Classical: 44.7% expected score (407 games)
  • 1600-1799 rating, UltraBullet: 57.0% expected score (113 games)
  • 1600-1799 rating, Bullet: 50.8% expected score (8,224 games)
  • 1600-1799 rating, Blitz: 49.7% expected score (11,250 games)
  • 1600-1799 rating, Rapid: 48.9% expected score (6,413 games)
  • 1600-1799 rating, Classical: 47.0% expected score (281 games)
  • 1800-1999 rating, UltraBullet: 58.8% expected score (27 games)
  • 1800-1999 rating, Bullet: 52.3% expected score (6,724 games)
  • 1800-1999 rating, Blitz: 50.9% expected score (7,448 games)
  • 1800-1999 rating, Rapid: 51.5% expected score (3,658 games)
  • 1800-1999 rating, Classical: 52.3% expected score (129 games)
  • 2000-2199 rating, UltraBullet: 40.9% expected score (15 games)
  • 2000-2199 rating, Bullet: 54.1% expected score (5,432 games)
  • 2000-2199 rating, Blitz: 52.0% expected score (2,944 games)
  • 2000-2199 rating, Rapid: 54.7% expected score (839 games)
  • 2000-2199 rating, Classical: 73.0% expected score (29 games)
  • 2200-2499 rating, UltraBullet: 32.6% expected score (10 games)
  • 2200-2499 rating, Bullet: 53.8% expected score (2,521 games)
  • 2200-2499 rating, Blitz: 53.6% expected score (563 games)
  • 2200-2499 rating, Rapid: 57.1% expected score (90 games)
  • 2200-2499 rating, Classical: 70.0% expected score (1 games)
  • 2500+ rating, UltraBullet: 50.0% expected score (2 games)
  • 2500+ rating, Bullet: 49.7% expected score (317 games)
  • 2500+ rating, Blitz: 51.3% expected score (38 games)

Related Openings

Variations (5)
Blackmar-Diemer Gambit Declined: Brombacher Countergambit
47.4%
Blackmar-Diemer Gambit Declined: Elbert Countergambit
47.7%
Blackmar-Diemer Gambit Declined: Gedult Defense
51.5%
Blackmar-Diemer Gambit Declined: Langeheinicke Defense
49.4%
Blackmar-Diemer Gambit Declined: O'Kelly Defense
53.2%
Analyze Blackmar-Diemer Gambit Declined: Lamb Defense PositionsGet move-by-move win rates with the TrueElo analyzer

Frequently Asked Questions

What is the Blackmar-Diemer Gambit Declined: Lamb Defense win rate?

The Blackmar-Diemer Gambit Declined: Lamb Defense has a 47.6% (90% CI: 47.4%-47.8%) win rate for white, based on 171K rated games from Lichess.

At what rating does the Blackmar-Diemer Gambit Declined: Lamb Defense perform best?

The Blackmar-Diemer Gambit Declined: Lamb Defense performs best at 2000-2199 Elo with a 51.4% win rate for white (9.3K games). Win rate tends to decline at higher ratings as opponents know the theory better.

Is the Blackmar-Diemer Gambit Declined: Lamb Defense better in blitz or rapid?

UltraBullet (56.1%) outperforms Classical (43.9%) by 12.2%. Choose your time control wisely.

How sharp is the Blackmar-Diemer Gambit Declined: Lamb Defense?

The Blackmar-Diemer Gambit Declined: Lamb Defense has a sharpness score of 96.0 (very decisive), meaning 96.0% of games end decisively. Average game length is 31 moves.

What is the Blackmar-Diemer Gambit Declined: Lamb Defense win rate at 0-999 Elo?

At 0-999 Elo, the Blackmar-Diemer Gambit Declined: Lamb Defense has a 43.7% (90% CI: 43.2%-44.3%) win rate for white, based on 24K Lichess games. Average game length is 29 moves with a 5.2% draw rate.

What is the Blackmar-Diemer Gambit Declined: Lamb Defense win rate at 1000-1199 Elo?

At 1000-1199 Elo, the Blackmar-Diemer Gambit Declined: Lamb Defense has a 46.9% (90% CI: 46.4%-47.4%) win rate for white, based on 29K Lichess games. Average game length is 30 moves with a 4.4% draw rate.

What is the Blackmar-Diemer Gambit Declined: Lamb Defense win rate at 1200-1399 Elo?

At 1200-1399 Elo, the Blackmar-Diemer Gambit Declined: Lamb Defense has a 48.3% (90% CI: 47.8%-48.8%) win rate for white, based on 30K Lichess games. Average game length is 30 moves with a 3.8% draw rate.

What is the Blackmar-Diemer Gambit Declined: Lamb Defense win rate at 1400-1599 Elo?

At 1400-1599 Elo, the Blackmar-Diemer Gambit Declined: Lamb Defense has a 47.7% (90% CI: 47.2%-48.1%) win rate for white, based on 30K Lichess games. Average game length is 30 moves with a 3.5% draw rate.

What is the Blackmar-Diemer Gambit Declined: Lamb Defense win rate at 1600-1799 Elo?

At 1600-1799 Elo, the Blackmar-Diemer Gambit Declined: Lamb Defense has a 48.0% (90% CI: 47.5%-48.5%) win rate for white, based on 26K Lichess games. Average game length is 32 moves with a 3.6% draw rate.

What is the Blackmar-Diemer Gambit Declined: Lamb Defense win rate at 1800-1999 Elo?

At 1800-1999 Elo, the Blackmar-Diemer Gambit Declined: Lamb Defense has a 49.7% (90% CI: 49.1%-50.3%) win rate for white, based on 18K Lichess games. Average game length is 33 moves with a 3.7% draw rate.

What is the Blackmar-Diemer Gambit Declined: Lamb Defense win rate at 2000-2199 Elo?

At 2000-2199 Elo, the Blackmar-Diemer Gambit Declined: Lamb Defense has a 51.4% (90% CI: 50.6%-52.3%) win rate for white, based on 9.3K Lichess games. Average game length is 34 moves with a 4.2% draw rate.

What is the Blackmar-Diemer Gambit Declined: Lamb Defense win rate at 2200-2499 Elo?

At 2200-2499 Elo, the Blackmar-Diemer Gambit Declined: Lamb Defense has a 51.4% (90% CI: 50.0%-52.9%) win rate for white, based on 3.2K Lichess games. Average game length is 35 moves with a 4.8% draw rate.

What is the Blackmar-Diemer Gambit Declined: Lamb Defense win rate at 2500+ Elo?

At 2500+ Elo, the Blackmar-Diemer Gambit Declined: Lamb Defense has a 47.3% (90% CI: 43.0%-51.6%) win rate for white, based on 357 Lichess games. Average game length is 38 moves with a 5.2% draw rate.

What is the Blackmar-Diemer Gambit Declined: Lamb Defense win rate in UltraBullet?

In UltraBullet games, the Blackmar-Diemer Gambit Declined: Lamb Defense has a 56.1% (90% CI: 51.7%-60.3%) win rate for white (358 Lichess games). Draw rate is 0.4%.

What is the Blackmar-Diemer Gambit Declined: Lamb Defense win rate in Bullet?

In Bullet games, the Blackmar-Diemer Gambit Declined: Lamb Defense has a 50.1% (90% CI: 49.7%-50.4%) win rate for white (50K Lichess games). Draw rate is 2.7%.

What is the Blackmar-Diemer Gambit Declined: Lamb Defense win rate in Blitz?

In Blitz games, the Blackmar-Diemer Gambit Declined: Lamb Defense has a 47.2% (90% CI: 46.9%-47.5%) win rate for white (76K Lichess games). Draw rate is 4.5%.

What is the Blackmar-Diemer Gambit Declined: Lamb Defense win rate in Rapid?

In Rapid games, the Blackmar-Diemer Gambit Declined: Lamb Defense has a 45.7% (90% CI: 45.3%-46.1%) win rate for white (42K Lichess games). Draw rate is 4.8%.

What is the Blackmar-Diemer Gambit Declined: Lamb Defense win rate in Classical?

In Classical games, the Blackmar-Diemer Gambit Declined: Lamb Defense has a 43.9% (90% CI: 41.7%-46.0%) win rate for white (1.4K Lichess games). Draw rate is 5.6%.

Is the Blackmar-Diemer Gambit Declined: Lamb Defense a good opening?

The Blackmar-Diemer Gambit Declined: Lamb Defense is statistically balanced with a 47.6% (90% CI: 47.4%-47.8%) win rate across all ratings. It performs best at 2000-2199 Elo. Your results depend on your rating, time control, and how well you know the typical plans.