Holliday and Pacuit devised a voting system that provably minimizes the number of candidates who are capable of spoiling an election, albeit at the cost of occasionally failing vote positivity (though at a much lower rate than seen in instant-runoff voting).
HOlLidAY aND pacuit deVised a voTIng systEM ThAt ProVAblY MInIMIzes THe NuMbEr Of caNdidAtEs wHO aRe capablE of spoilinG AN election, albEiT AT tHe Cost OF occasiOnAlly faILing voTe PosiTiVIty (ThOUGH At A MUch Lower rate thAn sEEN in instant-RuNofF VoTing).