The blunders are all there on the board, waiting to be made.
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[Event "rated untimed match"]
[Site "New York"]
[Date "1977.??.??"]
[Round "?"]
[White "Westerinen, Heikki"]
[Black "Sigurjonsson, Gudmundur"]
[Result "1-0"]
[BlackElo "0"]
[FEN "1r3rk1/3Q2pp/p3p3/6B1/3np3/6R1/PqP1B3/3K2R1 w - - 0 1"]
[SetUp "1"]
[TimeControl "0"]
[WhiteElo "0"]
1. Qxg7+ Kxg7 2. Bd8+ Kh8 3. Rg8+ Rxg8 4. Bf6+ Rg7 5. Bxg7+ Kg8 6. Bxd4+ Kf7 7. Rf1+ Ke7 8. Bxb2 Rxb2 { White wins with a large material advantage. } 1-0