www.chess.com replaced Capablanca's chess by Gothic chess because Capablanca's chess has got defects in the starting position. In
www.pychess.org, if Gothic chess cannot be made as default for starting position, then at least Carrera's or Bird's or Embassy or Conservative can be considered.
If historical roots count as well, then Carrera's chess dates back to 1617. This starting position is one of the 960 different possible rearrangement positions of the home rank pieces of Capablanca's chess with the pairs of bishops starting off on opposite coloured squares for each of the two players and with the king starting off in between the two rooks for each of the two players and Carrera's chess has got no defects in the starting position.
@asdfisuahw: Capablanca's chess is not fairly unbalanced in favour of white player. Ed Trice wrote this in a discussion in
www.chess.com variants forum.
Ed Trice got a patent for Gothic chess in 2000 and he submitted a proof tree that Capablanca's chess is a forced win for the white player. He ran the proof tree in 2003-2004 for 8 months in 20 computers and proved that white player always ended up winning at least 5 additional pawns than black player.
I am not sure about Capahouse, but according to Ed Trice, at least Capablanca's chess is a forced win for the white player by starting off right with the move of 1. d3.
From 2020 onwards, Gothic chess is renamed as Trice's chess to avoid confusion with a medieval-themed 8×8 chess brand.
@gbtami: By the way, what chess variant do you mean by 'zh'? Is it crazyhouse? If it is so, then why is it abbreviated as 'zh' and not as 'ch' (CrazyHouse)?