Chess Opening Theory/1. e4/1...b6/2. d4/2...Bb7/3. Bd3/3...f5/4. exf5/4...Bxg2

= Matovinsky Gambit Accepted =

4...Bxg2
Capturing white's unprotected g-pawn, and threatening white's cornered rook. White can now play:
 * 5. Qh5+, putting black's exposed King in check

Theory table
'''1.e4 b6 2. d4 Bb7 3. Bd3 f5 4. exf5 Bxg2'''