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I don't understand your question, Fergus. I think I have explained it above.

A third thing if I may ask in these game the king may castle in 2 ways with the rook that starts near the corner of the board or with the corner cannon. Omega chess implements a castle move with a non corner piece. Can I combine this with the regular castling subroutine in order to easily make my castle subroutine work?

What castling rule do you want it to work for?

Could you find the time to also solve for berolina pawns the problem that regular pawns used to have in fairychess.txt

Okay, I've done that.

@Fergus,

Could you find the time to also solve for berolina pawns the problem that regular pawns used to have in fairychess.txt

Thank you!

I can't figure it why but I have a green background and a blue highlight.

At some point, I started using highlight color instead. I included this in the form players could use to customize the appearance of a game, but I neglected to add it to the Edit form used by game designers. I have now added it in.

I can't figure it why but I have a green background and a blue highlight. Look here, please:

https://www.chessvariants.com/play/pbm/play.php?game=Grand+Apothecary+Chess+1&settings=Default

Fergus, What about the ability of changing the blue color of the highlighting when showing possible moves.

It uses the border color to highlight possible moves.

@Fergus, Hello,

I had asked 3 questions on this thread 2 weeks ago. It seems that you have missed them. Can you find time to take a look?

@Fergus, A third thing if I may ask in these game the king may castle in 2 ways with the rook that starts near the corner of the board or with the corner cannon. Omega chess implements a castle move with a non corner piece. Can I combine this with the regular castling subroutine in order to easily make my castle subroutine work?

@Fergus, I think the berolina pawns have the same problem that the regular pawns had!

Fergus, What about the ability of changing the blue color of the highlighting when showing possible moves.

You were correct in identifying the problem. The range functions for the Pawns did not take into account the value of fps. However, replacing 2 with fps would not allow for first Pawn moves that are shorter than the maximum possible distance. For example, if fps were set to 3, this would include 3-space moves, but it would not include 2-space moves. This is what I ended up with:

def White_Pawn-Range mergeall where #ori -1 1 where #ori 1 1 filter lambda (onboard #1) aggregate lambda (where #ori 0 #0) range 1 var fps =ori;
def Black_Pawn-Range mergeall where #ori -1 -1 where #ori 1 -1 filter lambda (onboard #1) aggregate lambda (where #ori 0 neg #0) range 1 var fps =ori;

These use aggregate to create an array of spaces a Pawn may advance forward to, and they use filter to weed out non-spaces that are out-of-range. They use a named parameter in order to use its value in the lambda function used by aggregate.

I have since modified the functions above to use the filter on all results:

def White_Pawn-Range filter lambda (onboard #1) mergeall where #ori -1 1 where #ori 1 1 aggregate lambda (where #ori 0 #0) range 1 var fps =ori;
def Black_Pawn-Range filter lambda (onboard #1) mergeall where #ori -1 -1 where #ori 1 -1 aggregate lambda (where #ori 0 neg #0) range 1 var fps =ori;

Finally, I replaced aggregate with an expanded version of the values operator. With a lambda function and an array, it will work just like filter except that it returns a sequential array of each value calculated by the lambda function. Unlike aggregate, it will include values of zero, because it does no filtering on the results it calculates. As it did before, it will return the values of an array if that is what's passed to it. If it does not get a lambda function or an array, it will return the rest of the arguments following it as a single array.

def White_Pawn-Range filter lambda (onboard #1) mergeall where #ori -1 1 where #ori 1 1 every lambda (where #ori 0 #1) range 1 var fps =ori;
def Black_Pawn-Range filter lambda (onboard #1) mergeall where #ori -1 -1 where #ori 1 -1 every lambda (where #ori 0 neg #1) range 1 var fps =ori;

Fergus, Is it not that in the fairy chess include file the functions :

def White_Pawn-Range array where #0 0 2 where #0 0 1 where #0 -1 1 where #0 1 1; def Black_Pawn-Range array where #0 0 -2 where #0 0 -1 where #0 -1 -1 where #0 1 -1;

for generality they should be:

def White_Pawn-Range array where #0 0 var fps where #0 0 1 where #0 -1 1 where #0 1 1; def Black_Pawn-Range array where #0 0 - var fps where #0 0 -1 where #0 -1 -1 where #0 1 -1;

?

Fergus, is there a way to customize the blue color that highlights possible moves?

Thanks!