Has anyone written a program that arbs the SP vs. ES? Since the ES only trades in 1/4 point increments and the SP trades in 1/10 point increments seems as though there is an opportunity to possibly create an automated system to arb. the 2 contracts under certain conditions. In other words, you get 2 1/2 ticks for each tick in the mini (ie. bid/buy 1265.25 in ES, simultaneously sell/ 1265.30 or 1265.40 or maybe even 1265.50 in SP). Any success?