Bishop's Opening: Boi Variation
4.6M games from Lichess · Updated January 2026
Black expected score · All ratings · All speeds
45.4%
the worst score you would still get, 90% confident. Its best is the same figure — the band is too tight to plot.
Measured over 4.6M games at this level and clock.
Black comes out behind here — there are better weapons in the list.
Outcomes for Black
Draw 3.8 · Score = win + ½ of the draws · 4.6M games
- Rank among the families Black can choose here
- not ranked — this is a variation, not a family
- Games in this context
- 4.6M
- Best context
- 48.6% at 0-999 UltraBullet
- Worst context
- 38.2% at 1800-1999 UltraBullet
- Average game length
- 31 moves
- Games that end decisively
- 96.2%
- Draws
- 3.8%
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: 44.3% at 0-999, 34.1% at 2500+.
| 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, UltraBullet: 48.6% expected score (2,265 games)
- 0-999 rating, Bullet: 43.8% expected score (92,292 games)
- 0-999 rating, Blitz: 44.0% expected score (226,285 games)
- 0-999 rating, Rapid: 41.8% expected score (263,192 games)
- 0-999 rating, Classical: 43.4% expected score (2,989 games)
- 1000-1199 rating, UltraBullet: 48.4% expected score (7,608 games)
- 1000-1199 rating, Bullet: 43.6% expected score (108,892 games)
- 1000-1199 rating, Blitz: 44.8% expected score (321,486 games)
- 1000-1199 rating, Rapid: 43.1% expected score (158,360 games)
- 1000-1199 rating, Classical: 41.3% expected score (6,355 games)
- 1200-1399 rating, UltraBullet: 47.5% expected score (16,520 games)
- 1200-1399 rating, Bullet: 44.7% expected score (145,178 games)
- 1200-1399 rating, Blitz: 45.8% expected score (546,606 games)
- 1200-1399 rating, Rapid: 44.9% expected score (211,394 games)
- 1200-1399 rating, Classical: 42.5% expected score (8,795 games)
- 1400-1599 rating, UltraBullet: 46.5% expected score (12,627 games)
- 1400-1599 rating, Bullet: 45.6% expected score (157,768 games)
- 1400-1599 rating, Blitz: 46.4% expected score (650,260 games)
- 1400-1599 rating, Rapid: 46.5% expected score (279,570 games)
- 1400-1599 rating, Classical: 45.6% expected score (12,470 games)
- 1600-1799 rating, UltraBullet: 42.7% expected score (3,825 games)
- 1600-1799 rating, Bullet: 45.8% expected score (135,717 games)
- 1600-1799 rating, Blitz: 46.6% expected score (501,059 games)
- 1600-1799 rating, Rapid: 46.6% expected score (237,333 games)
- 1600-1799 rating, Classical: 45.3% expected score (10,540 games)
- 1800-1999 rating, UltraBullet: 38.2% expected score (997 games)
- 1800-1999 rating, Bullet: 46.3% expected score (72,679 games)
- 1800-1999 rating, Blitz: 46.4% expected score (230,129 games)
- 1800-1999 rating, Rapid: 46.7% expected score (105,425 games)
- 1800-1999 rating, Classical: 45.4% expected score (2,934 games)
- 2000-2199 rating, UltraBullet: 34.0% expected score (89 games)
- 2000-2199 rating, Bullet: 46.3% expected score (24,901 games)
- 2000-2199 rating, Blitz: 45.9% expected score (45,007 games)
- 2000-2199 rating, Rapid: 45.4% expected score (14,990 games)
- 2000-2199 rating, Classical: 39.3% expected score (214 games)
- 2200-2499 rating, Bullet: 44.9% expected score (5,315 games)
- 2200-2499 rating, Blitz: 43.2% expected score (4,372 games)
- 2200-2499 rating, Rapid: 42.2% expected score (944 games)
- 2200-2499 rating, Classical: 25.7% expected score (17 games)
- 2500+ rating, Bullet: 39.3% expected score (465 games)
- 2500+ rating, Blitz: 30.4% expected score (144 games)
- 2500+ rating, Rapid: 32.6% expected score (10 games)
Related Openings
Methodology
Across every rating and clock, the Bishop's Opening: Boi Variation scores 45.4% for Black — we are 90% confident the real figure is between 45.4% and 45.5% — from 4.6M 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
- 4.6M+ 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 Bishop's Opening: Boi Variation win rate?
Playing the Bishop's Opening: Boi Variation, Black wins 43.5%, draws 3.8% and loses 52.7%. Counting a draw as half a point, that is an Expected Score of 45.4%. It rests on 4.6M rated games from Lichess.
At what rating does the Bishop's Opening: Boi Variation perform best?
The Bishop's Opening: Boi Variation performs best for Black at 1600-1799, with an Expected Score of 46.4% (888K games) and the highest Floor of any rating with enough games to read.
Is the Bishop's Opening: Boi Variation better in blitz or rapid?
For Black, the Bishop's Opening: Boi Variation scores higher in Blitz: an Expected Score of 45.9% in Blitz (2.5M games) against 44.9% in Rapid (1.3M games).
How sharp is the Bishop's Opening: Boi Variation?
The Bishop's Opening: Boi Variation has a sharpness score of 96.2 (very decisive), meaning 96.2% of games end decisively. Average game length is 31 moves.
What is the Bishop's Opening: Boi Variation win rate at 0-999?
At 0-999, Black wins 40.9%, draws 4.3% and loses 54.9%. Counting a draw as half a point, that is an Expected Score of 43.0%. It rests on 587K Lichess games, which average 22 moves.
What is the Bishop's Opening: Boi Variation win rate at 1000-1199?
At 1000-1199, Black wins 42.4%, draws 3.4% and loses 54.2%. Counting a draw as half a point, that is an Expected Score of 44.1%. It rests on 603K Lichess games, which average 27 moves.
What is the Bishop's Opening: Boi Variation win rate at 1200-1399?
At 1200-1399, Black wins 43.7%, draws 3.4% and loses 52.9%. Counting a draw as half a point, that is an Expected Score of 45.4%. It rests on 928K Lichess games, which average 30 moves.
What is the Bishop's Opening: Boi Variation win rate at 1400-1599?
At 1400-1599, Black wins 44.5%, draws 3.6% and loses 51.9%. Counting a draw as half a point, that is an Expected Score of 46.3%. It rests on 1.1M Lichess games, which average 33 moves.
What is the Bishop's Opening: Boi Variation win rate at 1600-1799?
At 1600-1799, Black wins 44.4%, draws 4.0% and loses 51.6%. Counting a draw as half a point, that is an Expected Score of 46.4%. It rests on 888K Lichess games, which average 35 moves.
What is the Bishop's Opening: Boi Variation win rate at 1800-1999?
At 1800-1999, Black wins 44.2%, draws 4.5% and loses 51.4%. Counting a draw as half a point, that is an Expected Score of 46.4%. It rests on 412K Lichess games, which average 36 moves.
What is the Bishop's Opening: Boi Variation win rate at 2000-2199?
At 2000-2199, Black wins 43.6%, draws 4.6% and loses 51.8%. Counting a draw as half a point, that is an Expected Score of 45.9%. It rests on 85K Lichess games, which average 37 moves.
What is the Bishop's Opening: Boi Variation win rate at 2200-2499?
At 2200-2499, Black wins 41.6%, draws 4.5% and loses 53.8%. Counting a draw as half a point, that is an Expected Score of 43.9%. It rests on 11K Lichess games, which average 36 moves.
What is the Bishop's Opening: Boi Variation win rate at 2500+?
At 2500+, Black wins 33.6%, draws 6.8% and loses 59.5%. Counting a draw as half a point, that is an Expected Score of 37.1%. It rests on 619 Lichess games, which average 36 moves.
What is the Bishop's Opening: Boi Variation win rate in UltraBullet?
In UltraBullet, Black wins 46.2%, draws 1.2% and loses 52.7%. Counting a draw as half a point, that is an Expected Score of 46.8%. It rests on 44K Lichess games.
What is the Bishop's Opening: Boi Variation win rate in Bullet?
In Bullet, Black wins 44.0%, draws 2.1% and loses 53.9%. Counting a draw as half a point, that is an Expected Score of 45.1%. It rests on 743K Lichess games.
What is the Bishop's Opening: Boi Variation win rate in Blitz?
In Blitz, Black wins 43.9%, draws 3.9% and loses 52.2%. Counting a draw as half a point, that is an Expected Score of 45.9%. It rests on 2.5M Lichess games.
What is the Bishop's Opening: Boi Variation win rate in Rapid?
In Rapid, Black wins 42.5%, draws 4.6% and loses 52.8%. Counting a draw as half a point, that is an Expected Score of 44.9%. It rests on 1.3M Lichess games.
What is the Bishop's Opening: Boi Variation win rate in Classical?
In Classical, Black wins 41.7%, draws 4.7% and loses 53.6%. Counting a draw as half a point, that is an Expected Score of 44.1%. It rests on 44K Lichess games.
Is the Bishop's Opening: Boi Variation a good opening?
The Bishop's Opening: Boi Variation is hard work for Black — it favours White. Across all ratings, Black wins 43.5% of its games and loses 52.7%. It performs best at 1600-1799. Your results depend on your rating, time control, and how well you know the typical plans.