Chessy
The Ponziani Opening: Jaenisch Counterattack with Bb5 – Black's Guide
You've grabbed a pawn with 4...Nxe4 in the Ponziani, and now White has to decide how to handle the extra material. This is the Jaenisch Counterattack with Bb5 — a sharp, principled line where Black has already broken the rules by capturing on e4 early. Over 87,000 games have reached this exact position, and the stats show it's a knife-edge fight. Stockfish evaluates the position at -0.37, a small plus for Black, which means you are slightly better here — but only if you know how to follow up. Let's see how the engine recommends you punish White's most common reply.
Play the Ponziani Opening: Jaenisch Counterattack: Bb5 against the engine
Free, no signup — you play black, the engine adapts to your level.
Play through this position in the interactive drill below. Face an adapting engine that tests your responses to White's most common moves — and see if you can a
Create a free account →What You're Fighting For: The Central Tension
By playing 4...Nxe4, you've immediately challenged White's ambitious centre. White's third move c3 was meant to support a later d4, but you've struck before that plan gets off the ground. Your knight on e4 is loose — it can be kicked or captured — but it also eyes f2 and threatens to disrupt White's development. The key idea: you want to keep the initiative by developing quickly and not letting White consolidate the centre. If White wastes time chasing your knight, you'll gain tempi with moves that bring your pieces out. Notice the pawn structure too — White has no pawn on d4 yet, and your e5 pawn locks the centre. This gives Black a comfortable, active game as long as you don't get careless with that advanced knight.
The Critical Moment: White's Most Common Move
By far the most popular reply in the database is 5.Bxc6, played in 31,910 games. At first glance it looks sensible: White trades a bishop for a knight and damages your queenside pawns. But Stockfish flags this as an inaccuracy — it loses about 0.6 pawns of advantage compared to the best move. Why? Because after 5.Bxc6 dxc6, White has given up the bishop pair and hasn't placed you under any immediate pressure. Meanwhile, your knight on e4 remains a nuisance, and you can follow up with Be7 and O-O, enjoying a solid position with the two bishops. White's score after this move is just 45.0% — well below the draw rate's fair share — so you should be happy to see this capture on the board. Just don't rush; develop calmly and you'll be the one pressing.
The Engine's Best Move — And How to Answer It
Stockfish's top recommendation is 5.O-O, a developing move that sidesteps the complications. The engine's continuation runs 5.O-O Be7 6.Bxc6 dxc6. On the board, this looks similar to the line above — White still trades bishop for knight — but the crucial difference is that White has castled first. Your king is still in the centre, and White's rook on f1 eyes the f-file. Even so, the evaluation remains a slight plus for Black. Your plan is the same: develop your bishop to e7, castle kingside, and enjoy your dynamic play. The statistics show White scoring 52.7% after 5.O-O — higher than after the immediate capture, but still nothing special for the first player. Trust the engine's verdict: you're the one with the better prospects if you continue soundly.
The Blunder to Watch For: 5.Nxe5
Some White players will try to win back a pawn immediately with 5.Nxe5, attacking your knight on e4 and your knight on c6 at the same time. This is a mistake — Stockfish says it loses roughly 2.3 pawns of advantage. After 5.Nxe5 Qe7, Black threatens ...Qxe5 and also attacks the knight on e5. White is in serious trouble. The database shows this move has been played 649 times, and White scores a miserable 37.0%. If your opponent tries this, you have a clear path to a big advantage. Just remember: your Qe7 puts the pressure on, and White will struggle to coordinate. This is exactly the kind of opening trap the Jaenisch Counterattack is famous for — and you'll be ready for it.
Results across 87,033 Lichess games
| Most-played continuation | Games | White wins |
|---|---|---|
| Bxc6 | 31,910 | 45.0% |
| O-O | 23,361 | 52.7% |
| Qe2 | 11,740 | 52.6% |
| d4 | 11,695 | 47.6% |
| d3 | 6,184 | 44.9% |
| Nxe5 | 649 | 37.0% |
Frequently asked questions
Is the Ponziani Jaenisch Counterattack Bb5 good for Black?
Yes. Stockfish evaluates the position at -0.37, a small plus for Black, meaning you are slightly better as Black. The statistics from over 87,000 games show a nearly even split: White wins 48.3%, draws 3.7%, and Black wins 47.9%.
What is the best move for White against the Jaenisch Counterattack?
The engine's best move is 5.O-O, which develops and gets the king to safety. After O-O Be7 Bxc6 dxc6, Black still holds a slight edge. The most popular move is 5.Bxc6, but that is actually an inaccuracy that improves Black's position.
What is the biggest mistake Black should look for in this opening?
The biggest mistake White can make is 5.Nxe5, which loses roughly 2.3 pawns. Black replies with Qe7, attacking the knight on e5 and threatening the queen fork. White scores only 37.0% after this blunder, so stay alert for it.
Should I play d5 right away after 5.Bxc6 or 5.O-O?
The engine suggests a quieter development plan first. After both 5.Bxc6 dxc6 and 5.O-O Be7 6.Bxc6 dxc6, Black's typical follow-up is to finish development — Be7 and O-O — rather than pushing d5 immediately. Let the position guide you; the knight on e4 is fine where it is for now.
How many games feature the Ponziani Opening: Jaenisch Counterattack: Bb5?
Over 87K Lichess games have reached the Ponziani Opening: Jaenisch Counterattack: Bb5 position. White wins 48.3%, Black wins 47.9%, with 3.7% draws — based on real rated games.