This is untested, but it's the way I would do it:
Dim P1 As Integer, P2 As Integer
Dim RPS(3) As Integer
Dim Winner As Integer
Dim x As Integer
Enum RPS
Rock = 0,
Paper,
Scissors
End Enum
RPS(0) = "Rock"
RPS(1) = "Paper"
RPS(2) = "Scissors"
Randomize
For x = 1 To 100
P1 = Int(3 * Rnd)
P2 = Int(3 * Rnd)
Select Case P1
Case Rock
Select Case P2
Case Rock
Winner = 0
Case Paper
Winner = 2
Case Scissors
Winner = 1
End Select
Case Paper
Select Case P2
Case Rock
Winner = 1
Case Paper
Winner = 0
Case Scissors
Winner = 2
End Select
Case Scissors
Select Case P2
Case Rock
Winner = 2
Case Paper
Winner = 1
Case Scissors
Winner = 0
End Select
End Select
lstP1.Items.Add RPS(P1)
lstP2.Items.Add RPS(P2)
lstWinner.Items.Add "Player " & Winner
Next x
You need three list boxes: Player 1, Player 2 and Winner.