X 0 / X 0 / X 0 / X 0 / X 0 / X -> 200, should be 210
Update following comments below : I stand by the 210 score here. Hitting a spare in the 10th frame means you get one
extra ball.
No, it's 200. tilly's slightly unusual exegesis of the 10th
frame above may have thrown you off. As you yourself
say, the tenth frame is scored exactly like the previous 9 - the spare gives
10 + the next ball (X) -> 10 + 10 = 20, just as in the other 9
frames. Each frame in the game scores 20, and
20 * 10 = 200. Perhaps seeing it in a more bowling-alley-like
style will help:
1 2 3 4 5 6 7 8 9 10
X 0/ X 0/ X 0/ X 0/ X 0/X
20 40 60 80 100 120 140 160 180 200