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checking for valid moves (othello/reversi)


I've been busy with programming a game for a week almost (beginner) and am now trying to check for all valid moves for the game of othello/reversi. When a valid move is detected it will be shown as a dot or question mark (in the array) So I'm checking for each empty place for an opponent token, if there is one I'll go check in the same direction for any other, till I have a token I own.

But for some reason not all valid places are shown. to be a bit more exact only the verticals and diagonal (under) are shown.

Public Shared Sub ShowIsValid(ByVal isTurn As Byte, ByRef isValid As Byte)
        Dim opponent As Char
        Dim player As Char
        If isTurn = 0 Then
            opponent = "o"c
            player = "x"c
            opponent = "x"c
            player = "o"c
        End If
        For row As Integer = 0 To 7
            For col As Integer = 0 To 7
                'is het veld niet leeg, For lus overslaan
                If Board.boardArray(row, col) <> " "c Then Exit For
                For rowDirection As Integer = -1 To 1
                    For colDirection As Integer = -1 To 1
                        If row + rowDirection < 0 Or _
                        row + rowDirection >= 7 Or _
                        col + colDirection < 0 Or _
                        col + colDirection >= 7 Or _
                        (rowDirection = 0 AndAlso colDirection = 0) Then Exit For
                        If Board.boardArray(row + rowDirection, col + colDirection) = opponent Then
                            x = row + rowDirection
                            y = col + colDirection
                                x += rowDirection
                                y += colDirection
                                If x < 0 Or x >= 7 Or y < 0 Or y >= 7 Then Exit Do
                                If Board.boardArray(x, y) = " "c Then Exit Do
                                If Board.boardArray(x, y) = player Then
                                    Board.boardArray(row, col) = "."c
                                    isValid += 1
                                    Exit Do
                                End If
                        End If
    End Sub
    Public Shared Sub resetShowValid()
        For i As Integer = 0 To 7
            For j As Integer = 0 To 7
                If Board.boardArray(i, j) = "." Then
                    Board.boardArray(i, j) = " "
                End If
    End Sub
End Class

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1 Solution
Ryan ChongCommented:
I did a othello/reversi during my college time, but unfortunately due to some disasters all the source codes written (in vb6) are gone...

However, I still have the compiled executable (but not the latest), which think you can download and then refer to:

MutsopAuthor Commented:
File aint accesable...

But does anyone here see a problem within the code?
I mean I've been checking the valid steps one by one for almost two dyas now but can't seem to find anything.
MutsopAuthor Commented:

I finally found out the problem :)

Instead of 'exit for' I just had to use 'continue for'
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