algo

team1:=[player 1, player 2, player 3, player 4, player 5];
team2:=[player 6, player 7, player 8, player 9, player 10];

x:=1;
y:=1;
placeholder:=0;

while y=!6
{
 sum1:=sum of team1;
 sum2:=sum of team2;
 difference1:=abs(sum1-sum2); //absolute value

 team1[x]:=placeholder;
 team1[x]:=team2[y];    //changing team members
 team2[y]:=placeholder;

 sum1:=sum of team1;
 sum2:=sum of team2;
 difference2:=abs(sum1-sum2);

  if difference1<difference2 then
  {
  team1[x]:=placeholder;  // no point in changing team members if
  team1[x]:=team2[y];     // the elo difference didn't become smaller
  team2[y]:=placeholder;
  }

 x++;

  if x=6 then
  {
  x=1;
  y++;
  }
}