Chance of CRC collison in chat (1.0 or '1 in 1'=certain)
Based on the 899 possible CRCs:

1 = 1 in 899
2 = 1 in 299.9
3 = 1 in 150.1
4 = 1 in 90.25
5 = 1 in 60.31
6 = 1 in 43.21
7 = 1 in 32.52
8 = 1 in 25.4
9 = 1 in 20.41
10 = 1 in 16.79
11 = 1 in 14.07
12 = 1 in 11.98
13 = 1 in 10.34
14 = 1 in 9.026
15 = 1 in 7.96
16 = 1 in 7.082
17 = 1 in 6.352
18 = 1 in 5.737
19 = 1 in 5.215
20 = 1 in 4.768

OR:


1 = 1 in 0.001112
2 = 1 in 0.003335
3 = 1 in 0.00666
4 = 1 in 0.01108
5 = 1 in 0.01658
6 = 1 in 0.02314
7 = 1 in 0.03075
8 = 1 in 0.03938
9 = 1 in 0.04899
10 = 1 in 0.05957
11 = 1 in 0.07108
12 = 1 in 0.08348
13 = 1 in 0.09673
14 = 1 in 0.1108
15 = 1 in 0.1256
16 = 1 in 0.1412
17 = 1 in 0.1574
18 = 1 in 0.1743
19 = 1 in 0.1918
20 = 1 in 0.2097