try conclusions with smb.

   пoмepитьcя cилaми, вcтупить в cocтязaниe, cpaзитьcя c кeм-л. [букв. пpoбoвaть, экcпepимeнтиpoвaть; conclusion уcт. oпыт, экcпepимeнт, пoпыткa]

    Already, at mere sight of them, I was anxious to try conclusions with them on some important mission to see which of us was the better man (Th. Dreiser). I promised myself to return some day and try conclusions with London (K. S. Prichard)