@EventHandler
public void onLeaderboardSurpass(LeaderboardSurpassEvent e) {
    if (e.getSurpassedPlayerOldRank() == 1) { //new player for 1st place
        //whatever code here
        String playerName = e.getPlayer().getName(); //the player that went up in ranking
        String surpassedPlayerName = e.getSurpassedPlayer().getName(); //the player who went down in ranking
        String gameName = e.getLeaderboard().getPlugin().getOutgoingGameAlias(e.getLeaderboard().getGameType()); //API example for game type name
           
        String msg = ChatColor.GREEN + playerName + " took 1st place from " + surpassedPlayerName + " in " + gameName + "!";
        Bukkit.broadcastMessage(msg);
    }
}