This collection includes games from a type of position that arises from various lines of the Queen's Gambit. White wins the exchange on a8, but generally has to waive his right to castle. The structure became well-known after Van Wely-Topalov 2006. Though there have always been strong players willing to go in for it as white, black has been more successful in practice. A further burst in popularity was seen in 2014 with the introduction into opening theory of the line 1.d4 d5 2.c4 dxc4 3.e4 b5 4.a4 c6 5.axb5 cxb5 6.Nc3 a6!?.