Aanca/Gryphon: moves one square diagonally and then like a rook on that same direction, also can move 1 square directly diagonally
Unicornio/Unicorn: moves like a Knight and then like a Bishop on that same direction, also can move directly as knight
Giraffe: a 3,2 Leaper
Lion: moves like a camel but it also can jump 3 squares vertically or horizontally
the king on grant acedrex can move or capture like a alibaba on its first move
the Bishop on grant acedrex looks like a crocodile and its called crocodile
pawns promote to the piece that was originally there on the 12th rank (except by the fact that a pawn on the g file becomes a Aanca/Gryphon instead of a King)
In my opinion Shako, Grant Acedrex and Omega chess should be added to Chess.com variants
Shako: almost all rules are the same the same as regular chess, the board is 10x10 and there are 2 fairy pieces:
elephant: Ferz + Alfil
cannon: moves like a rook but it must jump over one piece to capture
pawns promote to cannon, elephant, bishop, knight, rook and Queen on the 10th Rank
for more information: https://www.chessvariants.com/rules/Shako
The board is 12x12 (with some walls) and there are 2 fairy pieces:
Champion: Alibaba + Wazir
Wizard: Camel + Ferz
Pawns can move 3 squares foward (move only) on the their home rank
Pawns promote to Wizard, Champion, Knight, Bishop, Rook and Queen on the opponent backrank
for more information: https://www.chessvariants.com/large.dir/omega/rules.html
Grant Acedrex:
the board is 12x12
there are 4 fairy pieces:
Aanca/Gryphon: moves one square diagonally and then like a rook on that same direction, also can move 1 square directly diagonally
Unicornio/Unicorn: moves like a Knight and then like a Bishop on that same direction, also can move directly as knight
Giraffe: a 3,2 Leaper
Lion: moves like a camel but it also can jump 3 squares vertically or horizontally
the king on grant acedrex can move or capture like a alibaba on its first move
the Bishop on grant acedrex looks like a crocodile and its called crocodile
pawns promote to the piece that was originally there on the 12th rank (except by the fact that a pawn on the g file becomes a Aanca/Gryphon instead of a King)
Stalemate = stalemated player loses
for more information: https://en.m.wikipedia.org/wiki/Grant_Acedrex
so theres everything that have to be added to these variants be possible:
fairy pieces:
Elephant and Cannon (Shako)
Champion and Wizard (Omega Chess)
Aanca/Gryphon, Unicornio/Unicorn, Lion and Giraffe (Grant Acedrex)
New rules (edit rules)
Grant acedrex pawn promotion: make pawns promote like in grant acedrex
King Leap (Grant Acedrex): the king/royal piece can move or capture like a alibaba on its first move
Bishop -> Crocodile (grant acedrex)
Omega Chess and Shako are popular Variants and grant acedrex is a historical variant