The game continued 9.hxg8=Q+ Kxg8 10.Qe2 Bxh1 with a win by White after 24 moves.
I see no reason for rules that may prevent early pawn promotions in Grand Chess. Most of us want games that are more interesting, not less. And after all, there is no limit to the number of promoted pawns on the board in Shatranj.
[EDIT] I should have specified the rules that I was objecting to:
"5. A Pawn can promote only to a friendly piece that has been captured, and for which it is exchanged."
"6. If no friendly piece has been captured, then a Pawn may not move beyond the 9th rank."
M. Badii - J. Stranjakovitch, Paris 1989 reached the position in the diagram below after
1.e4 a6 2.d4 b5 3.f4 Bb7 4.Bd3 f5 5.exf5 Bxg2 6.Qh5+ g6 7.fxg6 Bg7 8.gxh7+ Kf8
The game continued 9.hxg8=Q+ Kxg8 10.Qe2 Bxh1 with a win by White after 24 moves.
I see no reason for rules that may prevent early pawn promotions in Grand Chess. Most of us want games that are more interesting, not less. And after all, there is no limit to the number of promoted pawns on the board in Shatranj.
[EDIT] I should have specified the rules that I was objecting to:
"5. A Pawn can promote only to a friendly piece that has been captured, and for which it is exchanged."
"6. If no friendly piece has been captured, then a Pawn may not move beyond the 9th rank."