Kangaroo Defense
Black throws the king's bishop out to b4 with check on move two, making White commit to a shape before the game has settled into one.
After 1. d4 e6 2. c4, the sober moves are 2...d5 or 2...Nf6. The Kangaroo skips both and gives check immediately. The point is to force White's hand. The goal is not to win material; it's to create practical problems. Block with 3. Nc3 and the game drifts toward Nimzo-Indian territory without Black ever committing a knight to f6; block with 3. Bd2 and Black can trade bishops or retreat, having pulled White's bishop to a modest square.
What Black buys with the early hop is flexibility. Because the king's knight is still at home, Black can follow up Dutch-style with ...f5, play ...b6 and ...Bb7 for an English Defense flavor, or simply transpose into main lines when it suits. What Black pays is time and, often, the bishop pair. Sooner or later White gains a tempo by asking that bishop what it is doing on b4.
The name paints the picture: one piece bounding out ahead of the rest. The main line with 3. Nc3 is catalogued as the Keres Defense, and that is most of the pedigree this opening owns. It has never been a main road at any level. Instead, it is a sidestep for players who want a d4 player thinking for themselves by move three.
Block the check on your terms, then take the center Black declined to fight for. After 3. Bd2 the plan is simple: trade the dark-squared bishops or gain time on a retreat, play e4, and enjoy a broad center with easy development. After 3. Nc3 be ready for Nimzo-style middlegames. Black may take on c3, so decide in advance whether doubled c-pawns bother you. The compensation is the bishop pair and a big center. Either way your trump is space, and a well-timed a3 makes the b4 bishop declare itself.
Stay uncommitted and make White's extra space a liability. Against 3. Nc3, treat it like a Nimzo: ...Nf6 or even ...f5 first, pressure on the e4 square, and ...Bxc3 at the right moment to leave White with doubled pawns you can blockade. Against 3. Bd2, either swap on d2 and set up a compact structure with ...d5 or ...f5, or drop the bishop back to e7 having decentralized White's bishop for free. Your one non-negotiable job is to stop White from building the full e4-plus-d4 center unchallenged.
At club level (1600-2000 on Lichess), the Kangaroo position turns up in about 494,000 community games; from the parent position after 1. d4 e6 2. c4, seen nearly 25 million times, only 2% of players choose 2...Bb4+. The replies tell a sober story: 3. Nc3 is the favorite at 54.9% and scores 56% for White, 3. Bd2 (40.7%) scores 55%, and the modest 3. Nd2 (4.3%) does best of all at 58%. Every main answer scores 55% or better for White, so treat this as a surprise weapon you have actually prepared, not a free lunch.
Paul Keres — The main line with 3. Nc3 is catalogued as the Keres Defense: the early ...Bb4+ ideas carry his name.
- Family
- Kangaroo Defense
- Category
- Semi-Closed
- First move
- 1.d4
- ECO
- A40
- Line
- 1. d4 e6 2. c4 Bb4+