[ECO code D00]
The Blackmar Gambit
White plays a dubious gambit by a King's Bishop's Pawn to KB3(f3) rather than playing the (improved) 3.Kt-QB3..~, 4.P-B3 line. Originated in 1881 by U.S. music publisher Armand Blackmar. Refuted by 3..P-K4, 4.B-K3 (4.QPxP..QxQ+ch) 4..KPxP. W-Alt.
White Black 1. P-Q4 P-Q4 2. P-K4!? PxP !?=interesting 3. P-KB3?! ?!=dubious
Example ends: Undo or Jump or Clear