Owen Defense
Initial Moves: 1.e4 b6
Strategic Summary & Main Idea
Owen's Defence answers 1.e4 with 1...b6 and fianchettoes the queen's bishop against the e4 pawn before contesting the centre with pawns. It is one of the costliest defences to 1.e4: the position after 1...b6 is +0.91, and the main line, with ...e6 and ...c5 against Bd3, measures the same. What the entry shows is where that number drops. The two lines in which Black pins the c3 knight with ...Bb4 measure +0.29 and +0.31, a third of the rest. And the two measured mistakes are Black's and expensive: 3...f5? measures +4.40, and 2...Nf6? reaches +3.17.
The pawn structure this opening produces
Owen's Defence starts with an asymmetrical structure: the b6 pawn opens the a8-h1 diagonal for the bishop, which presses e4 and later g2, while White occupies the centre with e4 and d4 unopposed. Black's plan is to attack that centre from the flanks, with ...e6 and ...c5, and the b7 bishop is what gives the plan meaning: if the e4 pawn advances or is exchanged, the diagonal opens towards White's castled king. White answers by defending e4 with Bd3 and Qe2, a formation that holds the pawn without giving up space. When Black plays ...Bb4 and pins the c3 knight, the defence of e4 weakens, and that is the line that cuts White's edge to a third. In the Hippopotamus set-up, with ...e6, ...d6, ...Nd7 and ...g6, Black gives up attacking the centre and builds a compact structure on the third rank, which holds but concedes all the space. The permanent weakness is c6 and the e8-h5 diagonal: with the bishop on b7, any early opening of the kingside, such as ...f5, leaves Black's king without cover.
Typical Plans for White
- Occupy the centre with e4 and d4 and defend e4 with Bd3 and Qe2 before the b7 bishop attacks it
- Against ...c5, push d5 and gain space when Black cannot play ...e6
- Against 2...Nf6, push 3.e5 and drive the knight away with c4: the position goes to +3.04
- Against 3...f5, take on f5: even after 4...Bxg2, the position measures +4.03
- Avoid the ...Bb4 pin by developing Nf3 and Bd3 before Nc3
Typical Plans for Black
- Fianchetto with ...Bb7 and press e4 with ...Nf6 and ...Bb4
- Attack the centre with ...e6 and ...c5 after completing development
- Pin the c3 knight with ...Bb4: both lines with the pin measure around +0.3
- Do not play 2...Nf6 against 2.d4: 3.e5 gains space with tempo
- Never open the kingside with ...f5 before castling: 3...f5 measures +4.40
Main Variations of the Owen Defense
| Variation | Move Sequence | Evaluation | Style / Characteristic |
|---|---|---|---|
| Main Line (3.Bd3 e6) | 1.e4 b6 2.d4 Bb7 3.Bd3 e6 4.Nf3 c5 5.c3 Nf6 6.Qe2 |
+0.91 | Bd3 and Qe2 defend e4 and Black attacks from the flanks |
| 3.Bd3 Nf6 4.Qe2 | 1.e4 b6 2.d4 Bb7 3.Bd3 Nf6 4.Qe2 e6 5.Nf3 c5 6.c3 |
+0.95 | The knight hits e4 first; the same structure and the same number |
| Hippopotamus set-up | 1.e4 b6 2.d4 Bb7 3.Nc3 e6 4.Nf3 d6 5.Bd3 Nd7 6.O-O g6 |
+0.84 | Compact structure on the third rank; it holds but concedes space |
| 3.Nc3 e6 4.Nf3 Bb4 | 1.e4 b6 2.d4 Bb7 3.Nc3 e6 4.Nf3 Bb4 5.Bd3 Nf6 6.Qe2 d5 |
+0.29 | The pin on the c3 knight weakens e4; Black's best line in the entry |
| English Defence (2...e6 3.c4) | 1.e4 b6 2.d4 e6 3.c4 Bb7 4.Nc3 Bb4 5.Bd3 f5 |
+0.31 | With c4 played, ...f5 works because the pin on c3 removes the defence of e4 |
| 2...Nf6 3.Bd3 Bb7 | 1.e4 b6 2.d4 Nf6 3.Bd3 Bb7 |
+0.92 | If White does not push e5, the position returns to the main line's level |
Evaluations measured by us with Stockfish 19, depth 22, on 15/09/2026.
Frequently asked questions
Is Owen's Defence bad?
It is one of the highest White evaluations against 1.e4: +0.91 after 1...b6, and the main line measures the same. It is not unplayable, but it requires knowing the ...Bb4 pin line, which cuts White's edge to +0.29.
What is the difference between Owen's Defence and the English Defence?
The English Defence is Owen's with ...e6 before ...Bb7 and with White having already played c4. The c4 structure allows ...Bb4 and ...f5 with White's centre pinned, and measures +0.31. In Owen's without c4, the same ...f5 is the costliest mistake in the entry.
Why is 2...Nf6 a mistake in Owen's Defence?
Because a knight without pawn support is chased with gain of time. After 3.e5 Nd5 4.c4 Nb4 5.a3 N4c6, White has played three space-gaining pawn moves, and the knight has returned to a square where it blocks the c-pawn: +3.17. With 2...Bb7 first, the same idea measures +0.92.
Common Mistakes & Where Most Amateurs Go Wrong
- 01 Attacking with 3...f5? against 3.Bd3. After 4.exf5, the b7 bishop can take g2, but 5.Qh5+ g6 6.fxg6 opens Black's king: the position measures +4.40 after 4.exf5 and still +4.03 after 4...Bxg2. The line:
1.e4 b6 2.d4 Bb7 3.Bd3 f5 4.exf5+4.40 - 02 Developing with 2...Nf6? against 2.d4. The knight hits e4, but 3.e5 Nd5 4.c4 Nb4 5.a3 N4c6 pushes it back with three space-gaining White pawn moves: +3.17. The line:
1.e4 b6 2.d4 Nf6 3.e5 Nd5 4.c4 Nb4 5.a3 N4c6+3.17
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