English Orangutan

The English Orangutan arises after 1. c4 Nf6 2. b4. It belongs to the Anglo-Indian complex, where 1...Nf6 keeps Black flexible and often heads for an Indian Defense once White plays d4. With 2. b4, White sets aside d4 and grafts the flank thrust of the Polish Opening, nicknamed the Orangutan, onto the English. The pawn gains space on the queenside, can later support a c4-c5 advance, and clears the way for the queen's bishop to take the long diagonal toward e5 and the black kingside.

The cost is a pawn on b4 that has no pawn protection, while White's center so far consists of the c4 pawn alone. Black's most direct answers exploit both points. The engine prefers 2...e5, 2...e6 and 2...d5. The first two open the f8 bishop's diagonal toward the b4 pawn, so White often has to spend a tempo looking after it. 2...e5 also claims central ground that a fianchettoed white bishop would want to pressure. 2...d5 takes the center directly and confronts c4.

In practice 2...g6 is the most common reply. Black fianchettoes in King's Indian fashion, placing a bishop on the long diagonal to blunt the one White aims to post there, and declines to fight over b4 straight away. Results after it are close to even. The next most frequent choice is 2...e6, which has given Black the best results of the main replies; 2...e5 ranks third and also scores well for Black. These lines tend to be strategic struggles over the queenside and the central dark squares, not sharp forcing battles, and the move is too rare to carry much established theory.

The line remains a minor sideline of the English, reached in only a few hundred online games. Black wins more often than White in the available statistics, and the engine assessment gives Black a slight edge after 2. b4. That suggests the early flank advance concedes the opening initiative, so the line serves mainly as a surprise weapon.