Throwing Away a Material Advantage
Odds Game, Example #1

Winning Chess Strategies, Diagram 3, p22

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

PGN

[Event "Queen Odds,"]
[Site "London"]
[Date "1870.??.??"]
[Round "?"]
[White "Potter"]
[Black "Amateur"]
[Result "1-0"]
[SetUp "1"]
[FEN "rnbqkbnr/pppppppp/8/8/8/8/PPPPPPPP/RNB1KBNR w KQkq - 0 1"]
[PlyCount "29"]

1. e4 e5 2. Nf3 Nc6 3. Bc4 Nf6 4. Nc3 Na5 5. Nxe5 Nxe4 6. d3 Nc5 7. Bxf7+ Ke7 8. Bg5+ Kd6 9. Nb5+ Kxe5 10. f4+ Kf5 11. Nd4+ Kg4 12. h3+ Kg3 13. Ne2+ Kxg2 14. Bd5+ Ne4 15. Bxe4# 1-0

End.