Battambang Opening

Popularity decreased 17% since 2013

A001.Nc3 e5 2.a3

Mar 27, 20261 min read

TL;DR After 1.Nc3 e5 2.a3, White prepares a slow b4 expansion. The opening avoids mainline theory entirely and aims for original positions — fine in club play, harmless against accurate central development.

Battambang Opening: A Complete Guide
Battambang Opening - Opening Moves

Summary

Starting from 1.Nc3 e5 2.a3, players enter the Battambang Opening — ECO A00. Lichess records 134,814 games in this line, which gives us a reliable view of how it actually performs in practice.

History and Notable Players

It arises from the Van Geet Opening: Reversed Nimzowitsch.

Common Mistakes

  • Drifting away from main theory — At 400 Elo, the three most-played moves cover 62.6% of games, against 83.4% at 2000. The most popular deviation is Nc6 (played 21.3% of the time at 400, much less so up top). It looks fine but quietly hands the better-prepared side an edge.
  • Neglecting development — Extra pawn moves in the opening are tempting, especially when you "know the moves". Developing a piece each turn is the simple correction.
  • Playing without a plan — Each Battambang Opening middlegame demands a specific approach. Decide whether the position calls for attack, manoeuvre, or simplification before reaching for a move.

Practice on Chessiverse

Ready to try the Battambang Opening against a bot? Pick an opponent at your level and play a game.

Play the Battambang Opening

Play As
Start From

After 1.Nc3 e5 2.a3 Pick the position up and play on from there.

Opponent

No account needed — your game saves if you sign up after.

Want the full game experience — enter the game arena!

Quick Facts

Games on Lichess
134,814
Most Popular At
400
Sharpness
Balanced
Prophylactic 2.a3 stops ...Bb4 and steers into slow, non-theoretical maneuvering play.
Main Line
1.Nc3 e5 2.a3
FEN
rnbqkbnr/pppp1ppp/8/4p3/8/P1N5/1PPPPPPP/R1BQKBNR b KQkq - 0 2
Style
Unorthodox

White wins 47.7%, draws 4.5%, Black wins 47.9%.

Data from Lichess opening explorer (blitz & rapid)

Unorthodox
Unorthodox openings deviate from classical principles to surprise opponents and lead the game into unfamiliar territory. They can be highly effective when the opponent is unprepared.

Popularity by Rating

Popularity view

It's played most at 400: about 1 in 18,000 games there, against 1 in 56,000 games at 1800. At 1200, White wins 47% and Black 50%; at 2200 it's 50% to 43%, with more draws (7%).

Percentage of all games at each rating bracket that feature this opening.

Data from Lichess opening explorer (blitz & rapid games)

Theory Adherence by Rating

Theory adherence view

At 1200, Black's most common reply is 2...d5 (29% of games), with four other moves each played in at least 1 in 20 games. By 2500 it comes down to three: 2...d5 (62%), 2...Nf6 (18%) and 2...Nc6 (14%).

How often players choose the single most popular move at this position. Higher = more predictable play.

Black to move after the opening line

Popularity Over Time

It's less popular than it used to be: about 1 in 42,000 games in 2025, down from 1 in 34,000 games in 2013. It peaked in 2017, at 1 in 15,000 games.

Share of all Lichess blitz + rapid games featuring this opening, by year.

Top Moves by Rating

Black to move after the opening line

Top moves by rating
RatingMost Popular2nd3rd
4002...Nf623.1%2...Nc621.3%2...d518.3%
10002...d526%2...Nf624.8%2...Nc619.7%
12002...d529.3%2...Nf626.1%2...Nc617.7%
14002...d533.2%2...Nf626%2...Nc614.9%
16002...d536.7%2...Nf625.8%2...Nc612.2%
18002...d542.9%2...Nf622.8%2...Nc610.5%
20002...d555.3%2...Nf618.7%2...Nc69.4%
22002...d555.6%2...Nf620.8%2...Nc611.4%
25002...d562%2...Nf617.7%2...Nc613.7%

Popularity by Time Control

The slower the game, the more it's played: about 1 in 23,000 rapid games, against 1 in 48,000 bullet games. White wins more often in bullet (50%) than in rapid (46%).

  • Bullet<0.01%55K
  • Blitz<0.01%87K
  • Rapid<0.01%47K

2% more decisive in bullet

Raw Data Tables (Lichess Blitz + Rapid)
Battambang Opening: popularity and win rates by player rating
Rating (Elo)Share %GamesWhite win %Black win %Draw %Sharpness
4000.0112,86243.650.95.40.946
10000.0019,50545.250.24.60.954
12000.0026,71646.549.64.00.960
14000.0026,27246.949.04.10.959
16000.0020,60149.146.94.00.960
18000.0015,20352.543.04.50.955
20000.009,20752.142.85.10.949
22000.003,71149.943.07.10.929
25000.0173744.146.59.40.906
Battambang Opening: move-choice theory adherence by rating
Rating (Elo)Top moveTop move %Viable movesTheory %Entropy
4002...Nf623.1562.62.913
10002...d526.0570.52.737
12002...d529.3573.12.644
14002...d533.2574.22.578
16002...d536.7574.72.523
18002...d542.9676.12.400
20002...d555.3483.42.045
22002...d555.6387.81.941
25002...d562.0393.31.691
Battambang Opening: popularity over time
YearShare %GamesWhite win %Black win %Draw %
20130.008438.158.33.6
20140.0036841.656.02.4
20150.001,05240.655.63.8
20160.013,74445.850.14.1
20170.017,38650.445.73.9
20180.008,72052.143.84.2
20190.0011,61849.346.34.4
20200.0016,19446.748.74.6
20210.0019,75045.649.64.8
20220.0018,72346.149.64.3
20230.0019,40247.947.64.5
20240.0020,00648.447.14.4
20250.0018,05448.347.14.6
Battambang Opening: popularity by time control
FormatShare %GamesWhite win %Black win %Draw %Sharpness
bullet0.0054,96150.446.72.90.971
blitz0.0087,43048.547.14.40.956
rapid0.0047,38446.149.44.50.955
Battambang Opening: top candidate moves by rating bracket
Rating (Elo)1st move1st %2nd move2nd %3rd move3rd %
4002...Nf623.12...Nc621.32...d518.3
10002...d526.02...Nf624.82...Nc619.7
12002...d529.32...Nf626.12...Nc617.7
14002...d533.22...Nf626.02...Nc614.9
16002...d536.72...Nf625.82...Nc612.2
18002...d542.92...Nf622.82...Nc610.5
20002...d555.32...Nf618.72...Nc69.4
22002...d555.62...Nf620.82...Nc611.4
25002...d562.02...Nf617.72...Nc613.7

Frequently Asked Questions

Battambang Opening

What is this opening?

This opening begins with 1.Nc3 e5 2.a3 and is classified under ECO code A00.

Is this opening good for beginners?

This opening can be played at any level. Beginners should focus on understanding the key strategic ideas rather than memorizing long theoretical lines. Our AI bots at various rating levels provide a great way to practice the opening concepts.

What are the win rates for this opening?

In a database of 134,814 games, White wins 47.7% of the time, Black wins 47.9%, and 4.5% are drawn.

How can I practice this opening?

On Chessiverse, you can practice this opening by playing against our 1,100+ AI bots. Each bot has a unique playing style and opening repertoire, so you can find the perfect sparring partner for any level.

Sources

Brought to you by

IM John BartholomewCo-Founder & Chess Educator

International Master and chess educator. Co-founded Chessable and joined Chessiverse as co-founder. Best known for his "Climbing the Rating Ladder" YouTube series and structured opening courses.

Practice This Opening on Chessiverse

Play against 1000+ AI bots with unique personalities and opening repertoires. From beginner-friendly to grandmaster-level opponents, find the perfect sparring partner for any opening.

Not sure which opening fits you? Take the free chess personality test — your style determines which openings will work with you.

Back to Articles