VB

Public Class Form1

    Dim letterOne, letterTwo, letterThree, compLetterOne, compLetterTwo, compLetterThree, posCorrect, colCorrect As Integer
    Private Sub Form1_Load(ByVal sender As System.Object, ByVal e As System.EventArgs) Handles MyBase.Load
        Randomize()
        compLetterOne = (4 * Rnd() + 1) : compLetterTwo = (4 * Rnd() + 1) : compLetterThree = (4 * Rnd() + 1)
        posCorrect = 0 & colCorrect = 0
        MessageBox.Show(compLetterOne + "-" + compLetterTwo + "-" + compLetterThree)
    End Sub
    Private Sub btnCheck_Click(ByVal sender As System.Object, ByVal e As System.EventArgs) Handles btnCheck.Click
        letterOne = getLetter(txtColor1.Text) 'Asc(txtColor1.Text.ToLower()) - 96 'convert first letter to integer
        letterTwo = getLetter(txtColor2.Text) 'Asc(txtColor2.Text.ToLower()) - 96 'convert second letter to integer
        letterThree = getLetter(txtColor3.Text) 'Asc(txtColor3.Text.ToLower()) - 96 'convert third letter to integer

        'Get number correct
        If compLetterOne = letterOne Then
            posCorrect += 1
            colCorrect += 1
        End If
        If compLetterTwo = letterTwo Then
            posCorrect += 1
            colCorrect += 1
        End If
        If compLetterThree = letterThree Then
            posCorrect += 1
            colCorrect += 1
        End If
        If compLetterOne = letterTwo Or compLetterOne = letterThree Then 'If first letter of computer is equal to second or third user number
            colCorrect += 1
        End If
        If compLetterTwo = letterOne Or compLetterTwo = letterThree Then 'If second letter of computer is equal to first or third user number
            colCorrect += 1
        End If
        If compLetterThree = letterOne Or compLetterThree = letterTwo Then 'If third letter of computer is equal to first or second user number
            colCorrect += 1
        End If

        lblColorsCorrect.Text = "Colors Correct: " & colCorrect
        lblPosCorrect.Text = "Positions Correct: " & posCorrect

        MsgBox(letterOne & "-" & letterTwo & "-" & letterThree & "-vs-" & compLetterOne & "-" & compLetterTwo & "-" & compLetterThree)
    End Sub
    Private Function getLetter(ByVal letter As String) As Integer
        Dim result As Integer
        Select Case letter
            Case "r" : result = 1
            Case "g" : result = 2
            Case "b" : result = 3
            Case "y" : result = 4
        End Select
        Return result
    End Function
    Private Sub userWon()
        MessageBox.Show("You win!")
    End Sub

    Private Sub Button1_Click(ByVal sender As System.Object, ByVal e As System.EventArgs) Handles Button1.Click
        txtColor1.Text = ""
        txtColor2.Text = ""
        txtColor3.Text = ""
        posCorrect = 0
        colCorrect = 0
        lblColorsCorrect.Text = "Colors Correct: 0"
        lblPosCorrect.Text = "Positions Correct: 0"
    End Sub
End Class