Reversed Spanish Opening involves black playing the move Bb4, and on eyeing the c3 knight though white can proceed ahead with his development as the knight grabbing a pawn is not really a threat as white again gets a counter to take back the pawn.
1.e4 e5 2.Nc3 Nf6 3.Bc4 Bb4 4.Nf3 0-0 5.0-0 d6 6.Nd5 Be6 7.d4 Bxd5 8.exd5 e4 9.Nh4 c6 10.c3 Ba5 11.Bg5 Nbd7 12.Nf5 Nb6 13.f3 h6 14.Bh4 e3
Giving up the pawn on the d3 square.
15.Qd3 Nxc4 16.Qxc4 Qd7 17.Nxe3 Nh5 18.Rae1 Bd8 19.Bxd8 Rfxd8 20.Qd3 Rab8 21.b3 Nf6 22.dxc6 bxc6 23.Re2 a5 24.Rfe1 g6 25.d5 Nxd5 26.Nxd5 cxd5 27.Qxd5 Qa7+ 28.Kh1 Qc5 29.Qd2 d5 30.Re5 a4 31.bxa4 h5 32.f4 Rbc8 33.f5 Qxc3 34.Qh6
And an incoming checkmate!
In the Oxford variation,Bishop variation,Breyer Variation,Three Knight's Variation, Boden-Kieseritzky Gambit,Alekhine Variationand Reversed Spanish Opening,unlike some of the previous openings these can be played even in longer formats of the game as they are less riskier and positional to be played and hence played more by the high level of chess players.