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Mikenas Defense

A40For Black

1. d4 Nc6

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

Win rate, Black
43.4%40.9%42.1%46.4%
Band 600, n = 34,572Band 1000, n = 43,527Band 1400, n = 17,907Band 1800, n = 32,055
Blunder rate
60.5%52.3%36.6%25.8%
Band median 44.6%Band median 42.9%Band median 40.0%Band median 36.4%
Tier
DDDC
Black, band 600Black, band 1000Black, band 1400Black, band 1800
Share of games
0.8%0.3%0.2%0.2%
Of band 600 gamesOf band 1000 gamesOf band 1400 gamesOf band 1800 games
Every band, source period 2026-05
BandWhiteDrawBlackBlunderBook exitGamesTier
60051.0%5.6%43.4%60.5%ply 2.034,572D
100055.2%4.0%40.9%52.3%ply 2.043,527D
140054.0%3.9%42.1%36.6%ply 2.017,907D
180049.4%4.2%46.4%25.8%ply 2.032,055C

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 bandD at 600Blunder rate 60.5%, band median 44.6%

At 600, the Mikenas Defense scores 43.4% for Black across 34,572 games. Most openings score better than this at this level. Games in this line leave known theory around move 1 on average, and 60.5% include an early material blunder (86 games at 600).

1000Your bandD at 1000Blunder rate 52.3%, band median 42.9%

At 1000, the Mikenas Defense scores 40.9% for Black across 43,527 games. Most openings score better than this at this level. Games in this line leave known theory around move 1 on average, and 52.3% include an early material blunder (88 games at 1000).

1400Your bandD at 1400Blunder rate 36.6%, band median 40.0%

At 1400, the Mikenas Defense scores 42.1% for Black across 17,907 games. Most openings score better than this at this level. Games in this line leave known theory around move 1 on average, and 36.6% include an early material blunder (41 games at 1400).

1800Your bandC at 1800Blunder rate 25.8%, band median 36.4%

At 1800, the Mikenas Defense scores 46.4% for Black across 32,055 games. That is below average at this level. Games in this line leave known theory around move 1 on average, and 25.8% include an early material blunder (62 games at 1800).

Questions

Common questions about this page.

At 600, the Mikenas Defense scores 43.4% for Black across 34,572 games. Most openings score better than this at this level. Games in this line leave known theory around move 1 on average, and 60.5% include an early material blunder (86 games at 600).

At 1000, the Mikenas Defense scores 40.9% for Black across 43,527 games. Most openings score better than this at this level. Games in this line leave known theory around move 1 on average, and 52.3% include an early material blunder (88 games at 1000).

The Mikenas Defense (A40) is a line for Black. The main line runs 1. d4 Nc6.