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H. G. Muller wrote on Sun, Jan 17, 2010 10:16 AM UTC:

The version of WinBoard I put on my website (4.20100116) should include this. Unfortunately, Fairy-Max itself does not support Analyze mode, (or any other form of pondering), or the Move-Now command. All these would require Fairy-Max to pay attention to input while it is thinking, and to do that requires different code for Windows and Linux. The lack of these features make the variation support of WinBoard less useful with Fairy-Max.

I would be very curious to know how Fairy-Max is doing against the Thai software. Also if you cn see obvious mistakes it makes. I guessed a value of 300 for the Silver (compared to P=100, M=181, N=450). Another parameter is the promotion bonus: in the last version I lowered that to 60 cP, in stead of using the logical 80 cP (which is the difference between the P and M values) to discourage it from trading Pawns by promoting by capturing a Pawn, and have the Med recaptured. (Or equivalently, promote a Pawn, have the Med captured, and the capture some other Pawn). In general it seems bad to do this, because you effectively trade a Pawn that could promote for another one (that likely could not). Lowering the promotion bonus should cure that. (But it has the undesired consequence that if the Med does get captured and the material gets even again, the score will not go back to zero.)

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Fairy-Max

. Free open source chess variant software.

💡📝H. G. Muller wrote on Sat, Oct 6, 2018 05:51 AM UTC:

I do know that Android compiles of Fairy-Max are available, and that people use it for instance with Aart Bik's 'Chess for Android' app. The latter only supports normal Chess, however, and none of the other variants Fairy-Max plays. WinBoard / XBoard is certainly not available for Android; it would have to be completely rewritten for that. I am not aware of any chess-variant-capable GUIs that can work with engines for Android. I don't have an Android device myself.

lweifjwielfjewfoiwjo lwiejosldfiew wrote on Fri, Oct 5, 2018 11:00 PM UTC:

Are there any known Android Apps that use Fairy-Max as their chess engine?

Steven Streetman wrote on Tue, Oct 26, 2010 07:21 PM UTC:

Thanks. I will see what I can do.

💡📝H. G. Muller wrote on Tue, Oct 26, 2010 06:41 PM UTC:

Fairy-Max knows the concept of royal pieces, the capture of which means the
end of the game. You can have more of those, but in that case loss of the
first means loss of the game, so they still would not be allowed to venture
into check. From what you say, I gather your game is different. Which would
mean you cannot play it with Fairy-Max by just changing the piece
definitions in the fmax.ini file.

That of course does not mean that Fairy-Max could not be adapted to handle
the novel winning condition at the level of the C code. I have for instance
made a derivative to play Shatranj, which implements the baring rule as
winning condition, and this required just three extra code lines. To judge how
easy or difficult this would be, requires exact knowledge of the winning
condition.

Steven Streetman wrote on Tue, Oct 26, 2010 05:38 PM UTC:

H. G. Muller

Thanks for your suggestion concerning applying Fairy-Max to my chess
variant. I have just starting looking at chess variant playing software and
there are a few. Before I download it and start trying to figure it out I
have a question.

Question:
My chess variation is different in that one side (white) has one King and
the other side (black) has two Kings.  There are, consequently, very
specific rules concerning checking the black King(s) and checkmate. For
example when black has two kings in play they are immune to check but not
immune if they are simultaneously checked. So I am wondering if this
circumstance would preclude the use of Fairy-Max?

Number of ratings: 2, Average rating: Average, Number of comments: 24

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