Throwing Away a Material Advantage
Odds Game, Example #2

Winning Chess Strategies, Diagram 4, p24

Seirawan shows an example of "Queen-Knight Odds", to prove it is possible to have a Material Advantage, yet still manage to lose the game ...

PGN

[Event "Queen-Knight Odds,"]
[Site "Nottingham"]
[Date "1874.??.??"]
[Round "?"]
[White "Ward"]
[Black "Browne"]
[Result "1-0"]
[SetUp "1"]
[FEN "rnbqkbnr/pppppppp/8/8/8/8/PPPPPPPP/R1BQKBNR w KQkq - 0 1"]
[PlyCount "29"]

1. e4 e5 2. f4 exf4 3. Nf3 f5 4. Bc4 fxe4 5. O-O exf3 6. Qxf3 Bc5+ 7. d4 Bxd4+ 8. Kh1 d6 9. Bxf4 Nf6 10. Rae1+ Kf8 11. Qd5 Qd7 12. Qxd4 Nc6 13. Qxf6+ gxf6 14. Bh6+ Qg7 15. Rxf6# 1-0

End.