function count = doMiddle(piece, l, w)
global newCount

for i = 2:(l - 1)
    for j = 2:(w - 1)
        if piece(i, j) == 0
            if piece(i - 1, j) || piece(i + 1, j) || piece(i, j - 1) || piece(i, j + 1)
                newPiece = piece;
                newPiece(i, j) = 1;
                tryPiece(newPiece);
            end
        end
    end
end

count = newCount;