Originally posted by Vlad Rasputin
How is this possible? Does catch% break into the game and affect things like the QB's throws and the CB's deflection chance?
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I think the connection is fairly obvious, but in the off chance that this question is based on an honest misunderstanding of the system, here goes. Higher catching = better chance to catch the ball, all other things being equal. Catch% aeq is just a multiplier of (not directly added) your base chance to catch the ball, so the higher your natural chance of catching the ball, the more juice you are getting out of your catch% aeq.
A highly stylized example: if - based on your various attributes - you only have a 10% chance to catch a given ball, your 30% catch ball aeq would boost your chances to 13% (0.1 * 1.3 = .13) - a 3% effective increase. If your base chance was higher, say 50%, the boost would be larger (0.5 *1.3 = 0.65, i.e., a 15% effective increase).
Now, I don't think the code works precisely like this (because whether you catch the ball or not depends on a series of rolls where your attributes + modifies are pitted against a defender's attributes + modifiers), but the principle is the same. If your base "score" going into the roll-off is a 10, your AEQ turns it into a 13. If it was a 50, your AEQ would turn it into a 65. Because catching is a large - though not exclusive - part of the catch-ball "score," the net effect of the AEQ increases as your catching attribute increases.
To answer your specific questions: (1) no, your catch ball AEQ does not affect your QB's throws other than insofar as the likelihood of you catching wayward passes is greater with higher catching; (2) yes, in the indirect manner described above, catch% AEQ affects the ability of a CB to deflect the ball (and your ability to catch the ball notwithstanding the deflection) by boosting your "score" going into the roll-off.
I can't be bothered to search right now, but if you look at Bort's comments on WRs/catching/etc...you'll see posts about the general sequence of events when the ball reaches the vicinity of a covered WR.