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Bird Opening

A02For WhiteAggressiveLow theory

1. f4

A line for White. Every figure below is computed separately for each rating band, and every one carries its own sample size.

Win rate, White
43.8%49.0%49.9%50.0%
Band 600, n = 30,145Band 1000, n = 104,297Band 1400, n = 97,912Band 1800, n = 269,015
Blunder rate
41.2%35.4%38.1%39.3%
Band median 44.6%Band median 42.9%Band median 40.0%Band median 36.4%
Tier
CBBB
White, band 600White, band 1000White, band 1400White, band 1800
Share of games
0.7%0.7%0.9%1.3%
Of band 600 gamesOf band 1000 gamesOf band 1400 gamesOf band 1800 games
Every band, source period 2026-05
BandWhiteDrawBlackBlunderBook exitGamesTier
60043.8%6.0%50.2%41.2%ply 1.030,145C
100049.0%3.8%47.2%35.4%ply 1.0104,297B
140049.9%3.7%46.5%38.1%ply 1.097,912B
180050.0%4.4%45.7%39.3%ply 1.0269,015B

Results by band

What it actually does, band by band.

All four bands are on the page. The one matching your rating is marked. Nothing here is averaged across bands.

600Your bandC at 600Blunder rate 41.2%, band median 44.6%

At 600, the Bird Opening scores 43.8% for White across 30,145 games. That is below average at this level. Games in this line leave known theory around move 1 on average, and 41.2% include an early material blunder (34 games at 600).

1000Your bandB at 1000Blunder rate 35.4%, band median 42.9%

At 1000, the Bird Opening scores 49.0% for White across 104,297 games. That is close to the average at this level. Games in this line leave known theory around move 1 on average, and 35.4% include an early material blunder (113 games at 1000).

1400Your bandB at 1400Blunder rate 38.1%, band median 40.0%

At 1400, the Bird Opening scores 49.9% for White across 97,912 games. That is close to the average at this level. Games in this line leave known theory around move 1 on average, and 38.1% include an early material blunder (97 games at 1400).

1800Your bandB at 1800Blunder rate 39.3%, band median 36.4%

At 1800, the Bird Opening scores 50.0% for White across 269,015 games. That is close to the average at this level. Games in this line leave known theory around move 1 on average, and 39.3% include an early material blunder (275 games at 1800).

Variations

Where the line goes next.

The lines that continue the Bird Opening, most played first at your band. Switch the band in the header and both the figures and the order follow.

  • DBBBA03

    Bird Opening: Dutch Variation

    1. f4 d5

    0.3% of games at 600, n = 11,0120.3% of games at 1000, n = 41,6110.4% of games at 1400, n = 38,0250.5% of games at 1800, n = 101,683

Questions

Common questions about this page.

At 600, the Bird Opening scores 43.8% for White across 30,145 games. That is below average at this level. Games in this line leave known theory around move 1 on average, and 41.2% include an early material blunder (34 games at 600).

At 1000, the Bird Opening scores 49.0% for White across 104,297 games. That is close to the average at this level. Games in this line leave known theory around move 1 on average, and 35.4% include an early material blunder (113 games at 1000).

The Bird Opening (A02) is a line for White. The main line runs 1. f4.