They don't make it clear, but if Delia had been working on a strike then they might have been 3 pins down, so she would need the double score to get 4 to win, if she gets one they get 2 an lose.
shareThey needed a strike AND a spare, so they must have been down by quite a lot. There's no good in tying the tie breaker game. A win was needed.
shareHere is the scenario in which the last scene works bowling wise The last roll of the contest is Delia's tenth. Delia could have came up as the last bowler to roll her team down by 19 pins working on a strike from her ninth frame. When she rolled an 8 she got the 8 pin bonus for 16 so she need three pins to tie. On her next throw she gets one pin she scores two and gets no further rolls so the match is over and if she gets two she scores four and does not need to use her spare bonus roll because it is irrelevant to the final result.
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