Nono, after all the modifiers are added together (in this case, the -999% means that the result is ALWAYS negative), the game restricts the accuracy to the range of 1% to 99%.
Except in the case of SE4's talisman, which gives you 100% accuracy.
Even against planets, 1 in 100 shots will miss completely, but its fun to razz somebody over it anyways when playing hotseat
