The first diagram position arose after 23...Qd8–h4! in Krasenkow–Seirawan, 34th Chess Olympiad, Istanbul 2000. Michael Rohde writes of Seirawan's 23rd move, "Holding things up through an x-ray on the pawn on d4." Black would respond to either 24.e5 or 24.exd5 with 24...Qxd4+.Michael Rohde, "Game of the Month", Chess Life, March 2001, p. 15.
