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Modern Defense: Bishop Attack, Monkey's Bum

7.7K games from Lichess · Updated January 2026

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Analyze this line move by move

Black expected score · All ratings · All speeds

57.0%

45%65%
Floor56.1%

the worst score you would still get, 90% confident. At best 57.9%.

Measured over 7.7K games at this level and clock.

Play Thiswins clearly more often than it loses at this level

A strong choice for Black at this level and clock.

Outcomes for Black

Draw 2.9 · Score = win + ½ of the draws · 7.7K games

Rank among the families Black can choose here
not ranked — this is a variation, not a family
Games in this context
7.7K
Best context
61.1% at 1200-1399 Blitz
Worst context
55.3% at 1600-1799 Bullet
Average game length
30 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 falls away as the rating rises: 54.5% at 0-999, 43.6% 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, Bullet: 57.6% expected score (628 games)
  • 0-999 rating, Blitz: 56.7% expected score (534 games)
  • 0-999 rating, Rapid: 61.1% expected score (215 games)
  • 0-999 rating, Classical: 42.4% expected score (5 games)
  • 1000-1199 rating, UltraBullet: 83.4% expected score (3 games)
  • 1000-1199 rating, Bullet: 55.4% expected score (278 games)
  • 1000-1199 rating, Blitz: 59.0% expected score (568 games)
  • 1000-1199 rating, Rapid: 61.8% expected score (236 games)
  • 1000-1199 rating, Classical: 61.2% expected score (3 games)
  • 1200-1399 rating, UltraBullet: 74.2% expected score (13 games)
  • 1200-1399 rating, Bullet: 52.8% expected score (338 games)
  • 1200-1399 rating, Blitz: 61.1% expected score (555 games)
  • 1200-1399 rating, Rapid: 59.9% expected score (282 games)
  • 1200-1399 rating, Classical: 64.3% expected score (16 games)
  • 1400-1599 rating, UltraBullet: 55.7% expected score (16 games)
  • 1400-1599 rating, Bullet: 58.5% expected score (458 games)
  • 1400-1599 rating, Blitz: 56.2% expected score (392 games)
  • 1400-1599 rating, Rapid: 56.8% expected score (198 games)
  • 1400-1599 rating, Classical: 80.6% expected score (23 games)
  • 1600-1799 rating, UltraBullet: 44.2% expected score (7 games)
  • 1600-1799 rating, Bullet: 55.3% expected score (617 games)
  • 1600-1799 rating, Blitz: 55.0% expected score (247 games)
  • 1600-1799 rating, Rapid: 60.1% expected score (103 games)
  • 1600-1799 rating, Classical: 39.5% expected score (8 games)
  • 1800-1999 rating, UltraBullet: 64.3% expected score (2 games)
  • 1800-1999 rating, Bullet: 55.7% expected score (616 games)
  • 1800-1999 rating, Blitz: 63.0% expected score (165 games)
  • 1800-1999 rating, Rapid: 59.1% expected score (37 games)
  • 1800-1999 rating, Classical: 38.9% expected score (3 games)
  • 2000-2199 rating, Bullet: 53.1% expected score (487 games)
  • 2000-2199 rating, Blitz: 51.0% expected score (105 games)
  • 2000-2199 rating, Rapid: 67.7% expected score (7 games)
  • 2200-2499 rating, Bullet: 57.5% expected score (309 games)
  • 2200-2499 rating, Blitz: 55.4% expected score (83 games)
  • 2200-2499 rating, Rapid: 30.0% expected score (1 games)
  • 2500+ rating, Bullet: 44.5% expected score (161 games)
  • 2500+ rating, Blitz: 42.7% expected score (19 games)

Related Openings

Parent
Modern Defense
48.7%
Variations (5)
Modern Defense: Two Knights Variation
50.0%
Modern Defense: Standard Defense
51.3%
Modern Defense: Standard Line
51.9%
Modern Defense: Three Pawns Attack
49.0%
Modern Defense: Geller's System
47.2%
Analyze Modern Defense: Bishop Attack, Monkey's Bum PositionsSee what each move is worth at your rating, move by move

Methodology

Across every rating and clock, the Modern Defense: Bishop Attack, Monkey's Bum scores 57.0% for Black — we are 90% confident the real figure is between 56.1% and 57.9% — from 7.7K 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
7.7K+ 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 Modern Defense: Bishop Attack, Monkey's Bum win rate?

Playing the Modern Defense: Bishop Attack, Monkey's Bum, Black wins 55.6%, draws 2.9% and loses 41.6%. Counting a draw as half a point, that is an Expected Score of 57.0%. It rests on 7.7K rated games from Lichess.

At what rating does the Modern Defense: Bishop Attack, Monkey's Bum perform best?

The Modern Defense: Bishop Attack, Monkey's Bum performs best for Black at 1000-1199, with an Expected Score of 58.9% (1.1K games) and the highest Floor of any rating with enough games to read.

Is the Modern Defense: Bishop Attack, Monkey's Bum better in blitz or rapid?

For Black, the Modern Defense: Bishop Attack, Monkey's Bum scores higher in Rapid: an Expected Score of 57.9% in Blitz (2.7K games) against 60.1% in Rapid (1.1K games).

How sharp is the Modern Defense: Bishop Attack, Monkey's Bum?

The Modern Defense: Bishop Attack, Monkey's Bum has a sharpness score of 97.1 (very decisive), meaning 97.1% of games end decisively. Average game length is 30 moves.

What is the Modern Defense: Bishop Attack, Monkey's Bum win rate at 0-999?

At 0-999, Black wins 56.4%, draws 2.6% and loses 40.9%. Counting a draw as half a point, that is an Expected Score of 57.8%. It rests on 1.4K Lichess games, which average 24 moves.

What is the Modern Defense: Bishop Attack, Monkey's Bum win rate at 1000-1199?

At 1000-1199, Black wins 56.9%, draws 3.9% and loses 39.2%. Counting a draw as half a point, that is an Expected Score of 58.9%. It rests on 1.1K Lichess games, which average 28 moves.

What is the Modern Defense: Bishop Attack, Monkey's Bum win rate at 1200-1399?

At 1200-1399, Black wins 56.9%, draws 3.5% and loses 39.5%. Counting a draw as half a point, that is an Expected Score of 58.7%. It rests on 1.2K Lichess games, which average 29 moves.

What is the Modern Defense: Bishop Attack, Monkey's Bum win rate at 1400-1599?

At 1400-1599, Black wins 56.8%, draws 2.1% and loses 41.1%. Counting a draw as half a point, that is an Expected Score of 57.9%. It rests on 1.1K Lichess games, which average 31 moves.

What is the Modern Defense: Bishop Attack, Monkey's Bum win rate at 1600-1799?

At 1600-1799, Black wins 54.3%, draws 2.3% and loses 43.4%. Counting a draw as half a point, that is an Expected Score of 55.5%. It rests on 982 Lichess games, which average 31 moves.

What is the Modern Defense: Bishop Attack, Monkey's Bum win rate at 1800-1999?

At 1800-1999, Black wins 56.0%, draws 2.6% and loses 41.4%. Counting a draw as half a point, that is an Expected Score of 57.3%. It rests on 823 Lichess games, which average 33 moves.

What is the Modern Defense: Bishop Attack, Monkey's Bum win rate at 2000-2199?

At 2000-2199, Black wins 51.5%, draws 2.7% and loses 45.7%. Counting a draw as half a point, that is an Expected Score of 52.9%. It rests on 599 Lichess games, which average 33 moves.

What is the Modern Defense: Bishop Attack, Monkey's Bum win rate at 2200-2499?

At 2200-2499, Black wins 54.9%, draws 3.9% and loses 41.2%. Counting a draw as half a point, that is an Expected Score of 56.9%. It rests on 393 Lichess games, which average 35 moves.

What is the Modern Defense: Bishop Attack, Monkey's Bum win rate at 2500+?

At 2500+, 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 180 Lichess games, which average 38 moves.

What is the Modern Defense: Bishop Attack, Monkey's Bum win rate in Bullet?

In Bullet, Black wins 54.5%, draws 1.6% and loses 43.9%. Counting a draw as half a point, that is an Expected Score of 55.3%. It rests on 3.9K Lichess games.

What is the Modern Defense: Bishop Attack, Monkey's Bum win rate in Blitz?

In Blitz, Black wins 55.6%, draws 4.5% and loses 39.8%. Counting a draw as half a point, that is an Expected Score of 57.9%. It rests on 2.7K Lichess games.

What is the Modern Defense: Bishop Attack, Monkey's Bum win rate in Rapid?

In Rapid, Black wins 58.3%, draws 3.6% and loses 38.2%. Counting a draw as half a point, that is an Expected Score of 60.1%. It rests on 1.1K Lichess games.

Is the Modern Defense: Bishop Attack, Monkey's Bum a good opening?

The Modern Defense: Bishop Attack, Monkey's Bum is good for Black. Across all ratings, Black wins 55.6% of its games and loses 41.6%. It performs best at 1000-1199. Your results depend on your rating, time control, and how well you know the typical plans.