Math-hammer is generally only about half-right. The number of possible outcomes when you roll dice is quite a bit larger than one might imagine. If you roll ten distinct dice, there are something like 450000 possible outcomes (essentially, six to the sixth power x10). It's too large a number to get a meaningfully accurate measure on. You can sort of half-ass it and figure that a model that's ballistic skill 4 will hit about two thirds of the time, and you can figure that a model that's got the same weapon skill as his opponent hits about half the time. Beyond that, it gets really innaccurate really quickly.
it helps in a sense where you have a vague idea of what your army can do. Unless you have a day where your dice defy the rules of math and become magical, in which they will constantly roll above 4+ or below. It is all a possibility and theres is a possibility for all of your dice rolls to be 6 the whole entire game, very unlikely, but a possibility which is why some people dont count on math-hammer
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