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I'm reading the core book about the mechanics and I see that a Success threshold of 4 is supposed to be challenging. Here's the exact wording.

The standard threshold is 1 (so only 1 hit is necessary to succeed), though other tests may have thresholds as high as 4 or more.

It doesn't sounds that high when you can easily have 15 dice in your pool. The table says that 4 is hard and 6 is extreme but on forums I read that a Troll with a bow can shoot at 900m with a -3 penalty to dice pool pretty easily...so where can I find examples of threshold if shooting an arrow one kilometer away seems to be easy?

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You have to tailor "challenging" to the reality of your own campaign. Nonetheless, people with 15 dice in their pool are supposed to be quite rare in SR4 (the mechanics don't allow you to get many more than that), so if your players have reached such exalted heights, make sure you give them appropriate (high but not absurdly so) thresholds for tasks that would be quite extraordinary for any normal person (with appropriate skill, without using edge) to pull off.

In particular, you should keep track of what the probability of getting a certain number of successes is at various numbers of pool dice (with just a straight roll, not counting edge or anything):

  Chance of getting at least N successes
       successes
pool    1   2   3   4   5   6   7   8   9  10  11  12  13  14  15  16
   1   33%  0%
   2   56% 11%
   3   70% 26%  4%
   4   80% 41% 11%  1%
   5   87% 54% 21%  5% .4%
   6   91% 65% 32% 10%  2% .1%
   7   94% 74% 43% 17%  5% .7%
   8   96% 81% 53% 26%  9%  2% .3%
   9   97% 86% 62% 35% 14%  4%  1% .1%
  10   98% 90% 70% 44% 21%  8%  2% .3%
  11   99% 92% 77% 53% 29% 12%  4%  1% .1%
  12   99% 95% 82% 61% 37% 18%  7%  2% .4%
  13   99% 96% 86% 68% 45% 24% 10%  3%  1% .2%
  14  100% 97% 89% 74% 52% 31% 15%  6%  2% .4% .1%
  15  100% 98% 92% 79% 60% 38% 20%  9%  3%  1% .2%
  16  100% 99% 94% 83% 66% 45% 26% 13%  5%  2% .4% .1%
  17  100% 99% 96% 87% 72% 52% 33% 17%  8%  3%  1% .2%
  18  100% 99% 97% 90% 77% 59% 39% 22% 11%  4%  2% .4% .1%

The way I'd use a table like this for most actions is decide how much of a chance an "ordinary" expert might have at a task like this (such expert probably having 8-10 dice from skill+attribute). For example, I might decide that the expert has at best a 1 in 10 chance, so the threshold should be 5 (9% chance for an expert with 8 dice to get that many). Now Mr. my-pool-is-15 has a 60% chance of pulling it off. Well--fair enough, he's just that good.

But you can also use the table to pick something which is genuinely challenging without making it impossible (e.g. something that they can fairly likely achieve with edge, but not without it). Say you now require 8 successes--poor Mr. 15-pool only has a 9% chance of getting at least 8. But with a reroll from edge, he'll now have a much better shot at it (more like 66%, in fact).

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I just look at the Sample Characters. Covert Ops Specialist. Infiltration dice pool in urban area would be 11 without any gear or augmentation yet. The Rigger piloting an aircraft would have 12 as a starting dice pool, again, without modifiers –  MrJinPengyou Aug 16 '12 at 19:19
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@MrJinPengyou - You can do it that way also, if you're more comfortable making a "sample character" be your standard. (They're generally better at the best thing they do than a "typical" expert; they've been min-maxed a bit.) –  Ichoran Aug 16 '12 at 20:19
3  
(And that's generally what you can expect from the average SR player :P ) –  Nigralbus Aug 17 '12 at 16:03
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