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XCOM - Enemy Unkown - Rapid Fire Dilemma

In the game XCOM - Enemy Unknown (2012 - Firaxis), you sometimes have a choice between making a 'Normal' shot (which has some percentage chance of hitting) or making a 'Rapid Fire' shot, which lets you shoot twice with a reduced chance of hitting. The game has been designed to use a 15% reduction on your Rapid Fire shots, and these graphs may help you decide which choice to make! It is interesting to see what the effects would be of different reduction amounts, and to think about what changes to your tactics would be. Changing the 'r' slider at the top lets you see different scenarios. If you just want to know what to do in the game, leave it at 15% and click on Show Conclusions. This presentation (with screenshots) may help you get the idea of the game.