Nikoloz Gudiashvili (1913 – 1998)
His fifth piano concerto can be found throughout youtube, it's a concerto popular amongst children in russia and ex soviet countries.
Perhaps you could provide some youtube/other links to back up this statement. A quick search of youtube under "Gudiashvili" reveals a sonatina, prelude, quartet, quintet, love song.... no piano concerto though. Same when I searched for გუდიაშვილი and Гудиашвили - his name in Georgian and Russian respectively.
Sorry to speak bluntly, but you have a frequent tendency to make statements like these which then do not stand up to scrutiny and can only be assumed to be false. Is this deliberate? See your many postings on Zolotarev by way of example - which include concrete statements that you have seen or even possess actual recordings but which you then seem unable to substantiate. And you wanted to be a moderator...