Ok, so the rule that you cannot destroy your own last Castle takes precedence, like in Atomic Chess. So with W: Cd1 B: Ce3, Qd2 it would be allowed to play Cxd2=C, as your new Castle would not be in check on d2.
I see there is an AI that plays this. Is that really strong, or is it just a demo?]
No. CxQd2 = pawn, because castles and pawns just take diagonal forward. They dont turnover on diagonal forward, they turnover just forward. This special rule for castles and pawns I create to honor traditional chess' pawns and to balance possibilities to take Bishops, Queens and all other combinations. So pawns are like in chess, warriors tanking the enemy, just take diagonal forward and move forward, so in turnover their takes are reserved to diagonal forward move while normal move and turnover or combine with friendly pieces is reserved to forward move. Nonetheless say that the double square move from first pawn move on traditional chess is honored by same possibility to move two squares ahead by castles.
In your example, White can move ahead to turnover with Queen, but Black cannot because its not in front, so the result will be a take instead a turnover.
This is a simple AI, too weak, just for demo review.
I really apreciate your interest and comments. Thank you. I hope more people get interest too.
[H. G. Muller wrote on 2019-06-25 CEST
Ok, so the rule that you cannot destroy your own last Castle takes precedence, like in Atomic Chess. So with W: Cd1 B: Ce3, Qd2 it would be allowed to play Cxd2=C, as your new Castle would not be in check on d2.
I see there is an AI that plays this. Is that really strong, or is it just a demo?]
No. CxQd2 = pawn, because castles and pawns just take diagonal forward. They dont turnover on diagonal forward, they turnover just forward. This special rule for castles and pawns I create to honor traditional chess' pawns and to balance possibilities to take Bishops, Queens and all other combinations. So pawns are like in chess, warriors tanking the enemy, just take diagonal forward and move forward, so in turnover their takes are reserved to diagonal forward move while normal move and turnover or combine with friendly pieces is reserved to forward move. Nonetheless say that the double square move from first pawn move on traditional chess is honored by same possibility to move two squares ahead by castles.
In your example, White can move ahead to turnover with Queen, but Black cannot because its not in front, so the result will be a take instead a turnover.
This is a simple AI, too weak, just for demo review.
I really apreciate your interest and comments. Thank you. I hope more people get interest too.