Hippopotamus Defence
Also known as Hippopotamus, Hippo
1.e4 g6 2.d4 Bg7 3.Nc3 d6
The Hippopotamus is a hypermodern waiting system where Black tucks every piece behind the third rank – pawns on a6, b6, d6, e6, g6 and h6, bishops fianchettoed to b7 and g7, knights on d7 and e7. Black concedes the centre, stays solid and springs a counterstrike once White overreaches.
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What it does
Rather than fight for the centre directly, Black builds a low, symmetrical "shell". Both bishops are fianchettoed onto the long diagonals, the knights sit on d7 and e7, and the pawns form a flexible barrier on the third rank. It can be reached against almost any White opening, part of its appeal. Black keeps every option open – the breaks ...c5, ...e5 and ...f5 all remain – then waits for White to commit, aiming to undermine an overextended pawn front and pounce on the weak squares left behind.
When to use it
Reach for the Hippo when you want one system against many different White openings, or when you relish slow, manoeuvring positions and out-playing an opponent later. It suits players who dislike long forcing lines and prefer understanding plans. It is also a fine surprise weapon: many opponents have no idea how to break through such a compact shell, and impatient attackers often overextend. Be ready, though, for a patient, cramped middlegame – not an opening for those who crave early fireworks.
Why it works
The shell is hard to crack: no weaknesses to target and no loose pieces on open lines. Since Black has not committed the centre, White's space can become a liability – every pawn pushed forward may later be attacked and can leave a square weak. The fianchettoed bishops quietly rake the long diagonals, ready to bite once lines open. If White attacks too hastily, Black hits back with ...c5, ...e5 or ...f5 and the broad pawn front can crumble. Petrosian used a Hippo-like setup versus Spassky in 1966.
Key ideas
- Fianchetto both bishops to b7 and g7, raking the long diagonals
- Keep pawns low on the third rank: a6, b6, d6, e6, g6, h6
- Place knights on d7 and e7, flexible and out of the way
- Wait patiently, then break with ...c5, ...e5 or ...f5
- Let White overextend, then attack the advanced pawns
- A universal system playable against almost any White opening
Watch out
The biggest danger is passivity: if Black shuffles aimlessly while White calmly builds up, the cramped position can be slowly strangled, so the central break must come at the right moment. Watch for White's Bh6 trade plus a kingside pawn storm (h4–h5) when castled on opposite wings; meeting Bh6 with ...Bh8 to keep the bishop is a typical resource.