The Hippopotamus is the ultimate system defence: Black arranges pawns on the third rank (g6, d6, e6, b6, later a6 and h6), fianchettoes both bishops, and posts the knights on e7 and d7. Nothing crosses the middle of the board until Black is fully coiled. Boris Spassky used it twice in his 1966 World Championship match against Petrosian and drew both games. It concedes space, and engines prefer White, but it is famously hard to attack and needs almost no move-order memory.
Build the fence: pawns on the third rank, bishops on g7 and b7, knights on e7 and d7, castle short, and only then counterpunch with ...c5, ...d5 or ...f5 against White's stretched centre.
White: White takes the space on offer, builds a broad centre, and must then make the hardest decision in the opening: when to advance. Correct play keeps the structure flexible and prepares a well-timed d5, e5 or f4-f5 break; overextending is exactly what the Hippo invites.
Black: Finish the fence before fighting: both fianchettoes, knights to e7 and d7, castle short, often ...a6 and ...h6 as useful waiting moves. Then strike where White has stretched: ...c5 or ...d5 in the centre, ...f5 against the kingside, opening the board only once your pieces stand better than theirs.
It is playable and remarkably resilient, but not ambitious: engines give White a pleasant space edge. Its practical strengths are real, though: no forced lines to memorize, no early targets, and opponents must beat you with their own ideas rather than preparation.
Yes. Spassky used Hippopotamus setups twice against Petrosian in their 1966 World Championship match and drew both games, the opening's most famous endorsement. It remains an occasional surprise weapon rather than a main-line choice.
By counterattacking an overextended centre. White's space must eventually be defended; when the pawns advance, Black hits them with the prepared breaks (...c5, ...d5 or ...f5) and the fianchettoed bishops suddenly rake an opening board.
BetterChess is a practice tool — we make no guarantee you'll reach 1800 or any rating. The lines here are standard, well-established opening theory, and every move is checked legal with the same engine the board runs.