One bad move nullifies forty good ones.
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[Event "Murfreesboro Chess"]
[Site "Murfreesboro"]
[Date "2019.02.23"]
[Round "?"]
[White "Hendricks, Scott"]
[Black "Hayes, David"]
[Result "0-1"]
[Annotator "David Hayes"]
[BlackElo "0"]
[ECO "B01"]
[FEN "rnb1k2r/pp2qppp/2pb1n2/4p3/1N1pP3/1QPB1N2/PP1P1PPP/R1B1K2R b KQkq - 0 1"]
[SetUp "1"]
[TimeControl "0"]
[WhiteElo "0"]
1... a5 { Game over.|The knight falls or worse. } 2. Nc2 ( { White can try: } 2. cxd4 axb4 3. dxe5 Bxe5 4. Nxe5 Qxe5 5. Qxb4 Nd5 6. Qb3 Nf4 7. O-O O-O { Black
wins with a large material advantage. } ) 2... a4 3. Qb6 ( { There is no escape for
the queen.|For example: } 3. Qc4 b5 4. Qb4 Bxb4 5. Nxb4 { Black wins with a
large material advantage. } ) 3... Nbd7 4. Qb4 Bxb4 5. Nxb4 Nc5 6. Bc2 Ncxe4 { Black
wins with a large material advantage. } 0-1