that was what i thought at first too. but we are not finding the EV of our shove, we are finding what the worst hand we can shove is that gives us 0EV (because in an unexploitable 5b shove range, the worst hand we shove will have an EV of 0).
to be honest i don't completely understand how this equation tells us this. but it was given to me by spoon, who knows his shit. so i've just accepted that this particular equation does what i've been told it does.
i assume that the equation uses "y" for the branch covering "he calls we win" and "1-y" for "he calls, we lose" because we are basically looking at worst case scenario - we are looking to find the lowest F values which give us 0EV based on certain y values. thus i guess we are singling out the worst two card combination in our shoving range, and thus we win 126.5 * the equity of the WORST hand in our range (namely "y") when he calls. and we then obviously lose 90 "1-y" (converted to %) of the time. i could be wrong here. regardless. i'd say it's safe to assume that the equation is right, and that i've fucked up somewhere in my working. or i just completely misunderstood what it's for.
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