Method that changes the color of opponents game pieces

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C#

WPF

Hi guys! Keep in mind that I'm still a beginner learning so I'm sorry for the long and probably annoying code.. I'm currently working on a (Reversi)game, and it works quite nicely so far (it allows the players to place their pieces on the "correct" spots). However now I just want to make the game pieces that another player takes over, to change to the player's own color. Here's what I have as my method to check if the player is making a valid move and therefore can "trap" the opponents game pieces (here is also where I'd like the opponents pieces to turn into the current players own color. I just don't know exactly where and how to put it. I would some tips and ideas on how I could think when doing this. My whole board fills up with rectangles that contain an ellipse, and this ellipse changes color with a converter. How could I in this method also change the color of the ellipses when they're trapped?

What I have tried:

<pre>public bool CapturePieces(object p)
        {
            var piece = GameBoard.First(t => t.Id == (int)p);
            PieceColor currentColor = CurrentPlayer.TypeOfColor;


            int x = piece.Coordinates.Item1;
            int y = piece.Coordinates.Item2;

            for (int dx = -1; dx <= 1; dx++)
            {
                for (int dy = -1; dy <= 1; dy++)
                {
                    if (dx == 0 && dy == 0)
                        continue;

                    if (x + dx < 0 || x + dx > 7 || y + dy < 0 || y + dy > 7)
                        continue;


                    if (GameBoard.Any(square => square.Coordinates == (x + dx, y + dy) && square.TypeOfColor != oppositeColor))
                        continue;

                    int i = 2;
                    while (i <= 7)
                    {
                        if (x + i * dx < 0 || x + i * dx > 7 || y + i * dy < 0 || y + i * dy > 7)
                            break;


                        if (GameBoard.Any(square => square.Coordinates == (x + i * dx, y + i * dy) && square.TypeOfColor == PieceColor.Empty))
                            break;


                        if (GameBoard.Any(square => square.Coordinates == (x + i * dx, y + i * dy) && piece.TypeOfColor == currentColor))
                        {
                            return true;
                        }

                        i++;
                    }

                }
            }
            return false;
        }