Thank you Skyscraper for starting this thread. Experimenting with different approaches is fun.
Here's one I thunk up the other day.
1. For each ability score, roll three times on Table A and record each result, and cross it off of Table A.
2. If you roll on Table A and get a result that is already crossed off, go down and find the next available one, use that result, and cross it off. If you are going down Table A and reach the end, start over back at the beginning.
Table A:
1d20: Result
1: 2
2: 2
3: 2
4: 3
5: 3
6: 3
7: 4
8: 4
9: 4
10: 5
11: 5
12: 5
13: 6
14: 6
15: 6
16: 6
17: 6
18: 6
19-20: Treat as a roll of 1. (Don't cross off the 19-20 entry, cross off the result you use.)
3. For each ability, sum the results you recorded.
Here's one I thunk up the other day.
1. For each ability score, roll three times on Table A and record each result, and cross it off of Table A.
2. If you roll on Table A and get a result that is already crossed off, go down and find the next available one, use that result, and cross it off. If you are going down Table A and reach the end, start over back at the beginning.
Table A:
1d20: Result
1: 2
2: 2
3: 2
4: 3
5: 3
6: 3
7: 4
8: 4
9: 4
10: 5
11: 5
12: 5
13: 6
14: 6
15: 6
16: 6
17: 6
18: 6
19-20: Treat as a roll of 1. (Don't cross off the 19-20 entry, cross off the result you use.)
3. For each ability, sum the results you recorded.