Over at TBB, I found the following percentages:
http://www.talkbloodbowl.com/phpBB2/viewtopic.php?t=24038
Assuming that you have a Team Re-Roll available, your chance of turn over is...
1) 3 Dice Block (I have Block) = 0.00%
2) 2 dice Block (I have Block) = 0.08%
3) 3 Dice Block (I don't have Block) = 0.14%
4) 2 dice Block (I don't have Block) = 1.23%
5) 1 die block (I have Block) = 2.78%
6) 2+ Roll (AG4 dodge) = 2.78%
7) 2+ followed by 2+ (two dodges with AG4) = 7.40%
8 ) 2 dice against Block (I have Block) = 9.36%
9) 1 die block (I don't have Block) = 11.1%
10) 3+ Roll (AG3 Dodge) = 11.1%
11) 3+ followed by 2+ (dodging into and then out of a TZ with AG4) = 16.67%
12) 3 dice against Block (I have Block) = 17.72%
13) 4+ Roll (AG2 Dodge) = 25.00%
14) 3+ followed by 3+ (two dodges with AG3) = 25.93%
15) 2 dice against Block (I don't have Block) = 30.86%
16) 4+ followed by 3+ (dodging into and then out of a TZ with AG3) = 38.89%
17) 5+ Roll (AG1 Dodge) = 44.44%
18 ) 3 dice against Block (I don't have Block) = 49.52%
19) 4+ followed by 4+ (two dodges with AG2) = 50.00%
20) 5+ followed by 4+ (dodging into and then out of a TZ with AG2) = 63.89%
21) 6+ roll (AG3 Long Bomb) = 69.44%
22) 5+ followed by 5+ (two dodges with AG1) = 66.67%
Without a Team Re-roll available your chance of turn over is...
1) 3 Dice Block (I have Block) = 0.46%
2) 2 dice Block (I have Block) = 2.78%
3) 3 Dice Block (I don't have Block) = 3.70%
4) 2 dice Block (I don't have Block) = 11.11%
5) 1 die block (I have Block) = 16.67%
6) 2+ Roll (AG4 dodge) = 16.67%
7) 2 dice against Block (I have Block) = 30.60%
8 ) 2+ followed by 2+ (two dodges with AG4) = 30.60%
9) 1 die block (I don't have Block) = 33.33%
10) 3+ Roll (AG3 Dodge) = 33.33%
11) 3 dice against Block (I have Block) = 42.10%
12) 3+ followed by 2+ (dodging into and then out of a TZ with AG4) = 44.40%
13) 4+ Roll (AG2 Dodge) = 50.00%
14) 3+ followed by 3+ (two dodges with AG3) = 55.56%
15) 2 dice against Block (I don't have Block) = 55.56%
16) 4+ followed by 3+ (dodging into and then out of a TZ with AG3) = 66.67%
17) 5+ Roll (AG1 Dodge) = 66.67%
18 ) 3 dice against Block (I don't have Block) = 70.37%
19) 4+ followed by 4+ (two dodges with AG2) = 75.00%
20) 5+ followed by 4+ (dodging into and then out of a TZ with AG2) = 83.33%
21) 6+ roll (AG3 Long Bomb) = 83.33%
22) 5+ followed by 5+ (two dodges with AG1) = 88.89%