Characteristics of good starting combos:
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start with multiple line clears (doubles, triples, tetrises)
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do successive line clears (with 1 or 2 exceptions)
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end with single line clears
Note, that it is very hard to get a 10 combo, when you start your combo with a single line clear as shown in the video. Next piece would have been a yellow O piece, which always allows you to begin with a Double (when going for 2 wide combos). Another way to start with a multiple line clear is to have a small ledge at the bottom.
Here a table of sent lines by combos at the beginning of a match:
1 -> 0 | 0
2 -> 1 | 1
3 -> 1 | 2
4 -> 1 | 3
5 -> 2 | 5
6 -> 2 | 7
7 -> 3 | 10
8 -> 5 | 15
9 -> 7 | 22
10-> 9 | 31
11->11 | 42
12->11 | 53
How to read the numbers: When your combo counter reaches 12, you send further 11 lines, which sums up to 53 lines in total (plus some lines for doubles, triples, tetrises).