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I copied these tables I made (from the development thread) for bonuses to score about 3rd best and 4th best tile. I'm not sure they are exactely the same values in the final version of the game, but the concept should still be this one.
2nd best tile on the left column, 3rd best tile bonuses to the score:
0 1 2 3 4 5 6 7 8 9 X 2X 3X 4X 5X
0 00
1 00 50
2 00 30 70
3 00 20 50 80
4 00 20 40 60 80
5 00 10 30 50 70 90
6 00 10 20 30 50 70 90
7 00 10 20 30 40 50 70 90
8 00 10 20 30 40 50 60 70 90
9 00 10 20 30 40 50 60 70 80 90
X 00 00 10 20 30 40 50 60 70 80 90
2X 00 00 00 10 20 30 40 50 60 70 80 90
3X 00 00 00 00 10 20 30 40 50 60 70 80 90
4X 00 00 00 00 00 10 20 30 40 50 60 70 80 90
5X 00 00 00 00 00 00 10 20 30 40 50 60 70 80 90
and so on...
2nd best tile on the left column, 4th best tile bonuses to the score:
0 1 2 3 4 5 6 7 8 9 X 2X 3X 4X 5X
0 00
1 00 05
2 00 03 07
3 00 02 05 08
4 00 02 04 06 08
5 00 01 03 05 07 09
6 00 01 02 03 05 07 09
7 00 01 02 03 04 05 07 09
8 00 01 02 03 04 05 06 07 09
9 00 01 02 03 04 05 06 07 08 09
X 00 00 01 02 03 04 05 06 07 08 09
2X 00 00 00 01 02 03 04 05 06 07 08 09
3X 00 00 00 00 01 02 03 04 05 06 07 08 09
4X 00 00 00 00 00 01 02 03 04 05 06 07 08 09
5X 00 00 00 00 00 00 01 02 03 04 05 06 07 08 09
and so on...
So, Score = 100 * (best^2 + 2nd best) + 3rd bonus + 4th bonus