You play 1. e4 and hit the clock. Your opponent looks at the board then back up at you- he’s got something up his sleeve: 1…Nc6. Do you dare play 2. d4 and enter the theory of the Nimzovich? No. You watched this ChessOpeningsExplained video and know that 2. Nf3 is the best continuation. An hour later your opponent stops the clock and tenders his resignation. Who knew watching a ten-minute video could do so much?
Notes on Colorado Gambit (which I think is dubious): 1.e4 Nc6 2.Nf3 f5 3.exf5 d5 4.Bb5 Bxf5 5.d4 (threatening 6. Ne5 winning material) Qd6 6.Ne5 Nf6 7.Nc3 Nd7 8.Bf4 Ncxe5 (Ndxe5 is worse because of 9.Bxe5 followed by 10.Qxd5; even after Qb4 10.Qxd5! Qxf4 11.Bxc6+ regains the piece (bxc6? 12.Qxc6+ forking king and rook)) 9.Bxe5 Qg6 10.Bxd7+ Kxd7!? 11.0-0 e6 12.Rc1 followed by 13.Ne2. Or 11…Bxc2 12.Qd2 Qd3 (12…e6?! 13.Rac1 Bd3 14.Ne2 (threatening both 15.Nf4 forking queen and bishop and 15.Rxc7+) Bxe2 (14…c6 15. Nf4 followed by 16. b3) 15. Rxc7+ and 16.Bxe2; 13…Be4 14.Nxe4 dxe4 15.Rxc7+ and 16.Rxb7 and White is up a pawn and has a rook on the 7th rank; these factors lead to a win for White; 13…Bf5 14.Nb5 attacking the c-pawn and threatening Rxc7+ c6 15.Qa5!! (threatening 16.Qc7+ Ke8 17.Nd6+ Bxd6 18.Bxd6, and Black loses the b-pawn and a-pawn due to the threat of 19.Qe7 mate) is bad for Black; the point is that 15…cxb5? leads to mate: 16.Rc7+ Kd8 (Ke8 17.Qxb5+ Kd8 18.Qd7 mate) 17.Rc8+! Kxc8 (17…Kd7 and 17…Ke7 also lose to 18.Qc7 mate) 18.Qc7 mate) 10…Bxd7 is more normal, but after 11.0-0 Black loses the pawn on d5 or c7.
I mean Ndxe5 is worse because of 9.dxe5 (not Bxe5) followed by 10.Qxd5; even after Qb4 10.Qxd5! Qxf4 11.Bxc6+ regains the piece (bxc6? 12.Qxc6+ forking king and rook
i mean after 14…Bxe2 (14…c6 15. Nf4 forking queening and bishop) 15. Rxc7+ and 16.Qxe2
After 10…Bxd7 11.0-0 Black plays c6 (defending both pawns), but after Ne2-f4 White has a lead in development (If Qg5 Re1 followed by Nf4).