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King's Knight Opening

C40For White

1. e4 e5 2. Nf3

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
52.1%51.3%50.7%50.5%
Band 600, n = 950,740Band 1000, n = 3,200,738Band 1400, n = 1,979,043Band 1800, n = 2,751,526
Blunder rate
31.4%26.2%26.8%27.0%
Band median 44.6%Band median 42.9%Band median 40.0%Band median 36.4%
Tier
SSAA
White, band 600White, band 1000White, band 1400White, band 1800
Share of games
22.3%22.6%18.4%13.2%
Of band 600 gamesOf band 1000 gamesOf band 1400 gamesOf band 1800 games
Every band, source period 2026-05
BandWhiteDrawBlackBlunderBook exitGamesTier
60052.1%4.4%43.5%31.4%ply 3.0950,740S
100051.3%3.8%44.9%26.2%ply 3.03,200,738S
140050.7%3.9%45.4%26.8%ply 3.01,979,043A
180050.5%4.4%45.1%27.0%ply 3.02,751,526A

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 bandS at 600Blunder rate 31.4%, band median 44.6%

At 600, the King's Knight Opening scores 52.1% for White across 950,740 games. That is one of the strongest results of any opening at this level. Games in this line leave known theory around move 2 on average, and 31.4% include an early material blunder (105 games at 600).

1000Your bandS at 1000Blunder rate 26.2%, band median 42.9%

At 1000, the King's Knight Opening scores 51.3% for White across 3,200,738 games. That is one of the strongest results of any opening at this level. Games in this line leave known theory around move 2 on average, and 26.2% include an early material blunder (130 games at 1000).

1400Your bandA at 1400Blunder rate 26.8%, band median 40.0%

At 1400, the King's Knight Opening scores 50.7% for White across 1,979,043 games. That is comfortably above average at this level. Games in this line leave known theory around move 2 on average, and 26.8% include an early material blunder (82 games at 1400).

1800Your bandA at 1800Blunder rate 27.0%, band median 36.4%

At 1800, the King's Knight Opening scores 50.5% for White across 2,751,526 games. That is comfortably above average at this level. Games in this line leave known theory around move 2 on average, and 27.0% include an early material blunder (111 games at 1800).

Variations

Where the line goes next.

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

  • BBCCC44

    King's Knight Opening: Normal Variation

    1. e4 e5 2. Nf3 Nc6

    12.4% of games at 600, n = 527,94815.0% of games at 1000, n = 2,126,69012.2% of games at 1400, n = 1,313,6228.9% of games at 1800, n = 1,851,834

  • CCBCC41

    Philidor Defense

    1. e4 e5 2. Nf3 d6

    2.5% of games at 600, n = 106,7663.2% of games at 1000, n = 451,2043.0% of games at 1400, n = 326,8072.1% of games at 1800, n = 443,787

  • DCCCC42

    Petrov's Defense

    1. e4 e5 2. Nf3 Nf6

    3.3% of games at 600, n = 142,5672.1% of games at 1000, n = 301,4351.7% of games at 1400, n = 182,3581.3% of games at 1800, n = 270,039

  • CDDDC40

    King's Pawn Game: Busch-Gass Gambit

    1. e4 e5 2. Nf3 Bc5

    1.3% of games at 600, n = 55,2710.7% of games at 1000, n = 105,9950.6% of games at 1400, n = 61,8480.3% of games at 1800, n = 62,192

  • CCCCC40

    King's Pawn Game: McConnell Defense

    1. e4 e5 2. Nf3 Qf6

    0.7% of games at 600, n = 29,4260.5% of games at 1000, n = 77,5060.4% of games at 1400, n = 39,1270.2% of games at 1800, n = 32,676

  • DDDDC40

    King's Pawn Game: Damiano Defense

    1. e4 e5 2. Nf3 f6

    0.8% of games at 600, n = 35,8990.4% of games at 1000, n = 56,3310.1% of games at 1400, n = 11,7340.0% of games at 1800, n = 6,795

  • DCCCC40

    Elephant Gambit

    1. e4 e5 2. Nf3 d5

    0.5% of games at 600, n = 20,2780.4% of games at 1000, n = 55,2010.4% of games at 1400, n = 37,6170.4% of games at 1800, n = 85,652

Questions

Common questions about this page.

At 600, the King's Knight Opening scores 52.1% for White across 950,740 games. That is one of the strongest results of any opening at this level. Games in this line leave known theory around move 2 on average, and 31.4% include an early material blunder (105 games at 600).

At 1000, the King's Knight Opening scores 51.3% for White across 3,200,738 games. That is one of the strongest results of any opening at this level. Games in this line leave known theory around move 2 on average, and 26.2% include an early material blunder (130 games at 1000).

The King's Knight Opening (C40) is a line for White. The main line runs 1. e4 e5 2. Nf3.