The third most common response to 1.d4 (after 1...Nf6 and 1...d5) is 1...e6. 1...e6 rarely has independent significance, usually transposing to another opening, e.g. the Dutch Defense (2.c4 f5 or 2.Nf3 f5), French Defense (2.e4 d5), or Queen's Gambit Declined (2.c4 d5). Another possibility is 2.c4. 2...Bb4+ is the Keres Defence (also known as the Kangaroo Defence), which is fully playable, but also little independent significance, since it often transposes into the Dutch, Nimzo-Indian, or Bogo-Indian. 2...b6 is the English Defense. As well, 1...e6 is sometimes used by players wishing to play the Dutch Defense (1.d4 f5) without allowing White the option of 2.e4!?, the Staunton Gambit.