Chessy
Portuguese Opening: a6 – A Level Fight Full of Pitfalls for Black
After 1.e4 e5 your bishop flicks out to b5, and Black immediately asks what you meant by it: 2…a6. In the Portuguese Opening, a6, you retreat the bishop to c4 – a square it often dreams of anyway. The position is dead level (Stockfish gives -0.01, a tiny sliver for Black that is basically nothing). You as White are sitting on a perfectly sound game. But here is the fun part: Black's most popular tries include two clear inaccuracies that you can punish. Over 40,000 games show that Black wins 57.1% of the time – but those numbers are heavily inflated by Black's best reply. Learn which moves to welcome and how to keep your edge. Scroll down to play the drill.
Play the Portuguese Opening: a6 against the engine
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Now that you know the plans and pitfalls, put them into practice. Play through the position against the engine below – watch for b5 and h6, and see how your win
Create a free account →Why This Opening Works for You
The Portuguese Opening: a6 isn't a gambit or a weird sideline. After 1.e4 e5 2.Bb5 a6 3.Bc4, you have simply moved your bishop to a strong diagonal. The engine evaluation is -0.01 – essentially perfect equality. That means you have given up nothing. You still have a lead in development (your bishop and queen's pawn are ready to go), your king is safe, and you can play solid classical chess. The only thing that changed is Black spent a tempo on …a6, which does not help their development. In most games, that extra move will turn into a slight lag for Black later – if you play accurately.
The Best Move and the Critical Follow-Up
The engine's top choice for Black is 3…Nf6, threatening your e4-pawn. That is also the most-played reply (10,848 games). Against it, the engine recommends: d3 (guarding the pawn and keeping your bishop on c4), then Nc6 and Nf3. You will reach a comfortable, slightly space-oriented position with no weaknesses. Black's knight on f6 is active but your d3 pawn controls e4 and frees your c1-bishop. In games where Black plays 3…Nf6, White scores 36.8% – not great, but remember this is Black's best reply. The other popular moves give you better chances.
The Two Inaccuracies You Should Smile At
Two of Black's most common replies are actually inaccuracies that lose measurable advantage. 3…b5 (played 10,564 times) is a mistake that costs Black about 0.6 pawns. Black chases your bishop, but the pawn on b5 becomes a target, and Black has weakened their queenside. 3…h6 (875 games) is even simpler – it wastes a move and loses roughly 0.5 pawns. Black wants to stop Bg5, but your bishop is on c4, not b5! Against both of these, you can continue with d3 or Nf3 and enjoy a clear edge. In games with 3…b5, White's score jumps to 41.7%, and with 3…h6 to 42.9%.
What the Statistics Reveal
At first glance, Black's 57.1% win rate across 40,711 games looks scary. But look closer: that number is dragged up by Black's best response (3…Nf6). Against every other common reply, White scores over 40% – solid for a starting position. The draw rate is low at 3.9%, meaning these games are decisive. If you face the Portuguese Opening: a6 as White, you have excellent practical chances because most opponents do not know the best moves. They will often play b5 or h6, handing you the edge. Even against 3…Nc6 (10,179 games, White 37.3%), you are fine – just play d3 and develop naturally.
Results across 40,711 Lichess games
| Most-played continuation | Games | White wins |
|---|---|---|
| Nf6 | 10,848 | 36.8% |
| b5 | 10,564 | 41.7% |
| Nc6 | 10,179 | 37.3% |
| d6 | 3,332 | 40.5% |
| Bc5 | 2,388 | 36.7% |
| h6 | 875 | 42.9% |
Frequently asked questions
Is the Portuguese Opening: a6 good for White?
Yes, it is perfectly sound. The engine evaluates it at -0.01, which is essentially equal. You are not worse; you have just transposed your bishop from b5 to c4. The opening is under-explored at club level, so you often catch opponents off guard.
What is the best move for Black against 3.Bc4?
The engine recommends 3…Nf6, attacking your e4-pawn. This is Black's strongest reply and also the most played (10,848 games). After 4.d3 Nc6 5.Nf3, the game is balanced and follows normal developing principles.
Should I be worried about Black's high win percentage?
Not really. Black's 57.1% win rate across 40,711 games includes all skill levels. Against Black's most popular aggressive tries like 3…b5 or 3…h6, your winning chances jump above 41%. Learn the simple refutations and you will outperform those statistics.
What is the punishment for 3…b5 in the Portuguese Opening?
The move 3…b5 is an inaccuracy that loses about 0.6 pawns of advantage. Black weakens the queenside and creates a target on b5. You can simply play 4.d3 to protect your e4-pawn, then follow up with Nf3 and 0-0, enjoying a comfortable edge against Black's overextended pawns.
How many games feature the Portuguese Opening: a6?
Over 40K Lichess games have reached the Portuguese Opening: a6 position. White wins 39.0%, Black wins 57.1%, with 3.9% draws — based on real rated games.