notyetagm: Damn, I play chess better than this and I am not on any Olympiad team.
Like Dr. Nunn wrote in his beginner's book on chess: <If your king is exposed to check, then you need only one loose piece to lose material to a double attack>.
Black seems to be totally unaware of this principle. First she plays 5 ... ♗b4??, creating a <loose (undefended) piece>, which togther with her exposed e8-king gives White the simple <double attack with check> 6 ♕a4+, winning a whole piece. The usual defense to this type of double threat is 6 ... ♘c6 but that fails here due to the White d5-pawn controlling the c6-square.
But wait, has Black learned her lesson? Shockingly the answer is no, for she repeats the exact same mistake just three moves later! With 8 ... ♘xd5??, Black makes another <loose (1 attacker, 1 defender) piece>, which together with her still exposed king gives the White queen yet another <double attack with check> 9 ♕b5+, losing yet another loose piece (d5-knight) to the exact same tactic (<queen fork>) that lost the first loose piece (b4-bishop). The usual defense to this type of double threat would be 9 ... c6 but that is not possible here since Black no longer possesses a c-pawn.
Hopefully after this game Black has learned that, in the immortal words of Dr. Nunn, <Loose Pieces Drop Off (LPDO)>.