The point of Sente's choice in Gokigen Nakabisha opening is at the 7th move. The diagram above is Gote moved the 6th move like R-5b. The lines to the position in the diagram is as following;

Sente 1 - P-7f
Gote 2 - P-3d
Sente 3 - P-2f
Gote 4 - P-5d
Sente 5 - P-2e
Gote 6 - R-5b

Various moves have been made for the 7th move such as P-2d, G-5h, G-7h, S-4h, Bx2b+ and so on in professional games. This entry is to show one standard sequence(Joseki) after G-7h as the seventh move. The both sides exchanges Rook Pawn in this sequence.

Sente 7 - G-7h *Meaning prevent Silver on 8h from being isolated after possible bishop exchange of Bx8h+
Gote 8 - P-5e *Advansing Rook Pawn
Sente 9 - P-2d *Trying to exchange Rook Pawn.
Gote 10 - Px2d *Taking P on 2d
Sente 11 - Rx2d *Taking back P on 2d
Gote 12 - P-5f *Trying to exchange Rook Pawn, too. Instead, G-3b to prevent R-2c+ is also possible.
Sente 13 - Px5f *Taking a P on 5f
Gote 14 - Rx5f *Taking back P on 5f. Check.
Sente 15 - K-6i! *What will happen if Gote moves 16.R-5g+? Then fork bishop drop to take either of King and Rook is waiting like 17.Rx2b+ 18.Sx2b 19.B*2d. No need to be afraid of Gote's rook promotion.
Gote 16 - G-3b *Preventing R-2c+ and increasing connection to B on 2b.
Sente 17 - S-4h *Preventing R-5g+. Instead, What will happen if Sente takes P on 3d by 17.Rx3d with intention of material advantage? Then Gote's Rook can get promoted such as 18.P*3c 19.R-2d 20.P*2c 21.R-2h 22.R-5g+. I think Gote's Rook promotion is better than Sente's Pawn advantage.
Gote 18 - K-6b *First step of building Mino castle in Gote's right side and enable Gote's Rook go back to the first rank(R-5a).

Here are the links to the gamerecords with this opening below. Let's see what have been happening after 18.K-6b. Sente's choice at 19th move is G-7g, P-6f or B-7g. I don't know why 19.Rx3d has not existed.

<G-7g as the 19th move >
August 19 2003, Takakazu Kodama vs Keiichi Sanada(Juni-sen)
Kifu for Java | KiFLA

July 26 2003, Shuji Muranaka vs Masakazu Kondo(Kinsho Cup)
Kifu for Java | KiFLA

January 21 2003, Yuji Maeda vs Masakazu Kondo(Juni-sen)
Kifu for Java | KiFLA

Octorber 11 2003, Keita Inoue vs Daisuke Suzuki(NHK Cup)
Kifu for Java | KiFLA

<P-6f as the 19th move >

September 5 2006, Hiroshi Okazaki vs Yasuaki Tsukada(Juni-sen)
Kifu for Java | KiFLA

August 22 2006, Yoshiharu Habu vs Yasumitsu Sato(Oui-sen)
Kifu for Java | KiFLA

July 26 2005, Koji Ichinose vs Makoto Tobe(3 dan league)
Kifu for Java | KiFLA

March 3 2005, Akihito Hirose vs Shinji Wada(3 dan league)
Kifu for Java | KiFLA

November 29, 2001, Makoto Chuza vs Shingo Hirafuji(Ginga-sen)
Kifu for Java | KiFLA

May 31, 2001, Takeshi Kawakami vs Keiji Mori(Hayazashi-sen)
Kifu for Java | KiFLA

January 27 2001, Nobuyuki Yashiki vs Tadahisa Maruyama(Hayazashi-sen)
Kifu for Java | KiFLA

November 16 2000, Hideyuki Takano vs Shingo Hirafuji(Ginga-sen)
Kifu for Java | KiFLA

September 19 2000, Yaichio Ohno vs Masakazu Kondo(Juni-sen)
Kifu for Java | KiFLA

August 18 2000, Yorhiharu Habu vs Masakazu Kondo(Kachinuki-sen)
Kifu for Java | KiFLA

July 10 2000, Koichi Fukaura vs Kosuke Tamura(Shinjino-sen)
Kifu for Java | KiFLA

<B-7g as the 19th move >

November 29 2002, Shingo Hirafuji vs Masakazu Kondo(Juni-sen)
Kifu for Java | KiFLA