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 Chess variants (8x8)

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23. Mayo 2006, 20:09:41
Chicago Bulls 
Crap! Are you the inventor? LOL! Well done....!
So when exactly did you publiced this game and when did you first thought of it and when did you resulted in its final rules?

24. Mayo 2006, 11:02:57
nabla 
Asunto: Re:
Pythagoras: Thank you ! Ambiguous Chess was born in January 2005, published on my web site, on chessvariants.com and some months later in the Variant Chess magazine.
Although it is a very simple idea, it came to my mind in a very roundabout way. By telling it I am a bit afraid to bore everyone with a long post, feel free to stop reading right here !

I read in the Encyclopedia of Chess Variants about a strange variant called "Unambiguous Three-symbol Chess", where the only moves allowed were those who could be written in three symbols in the English game notation. It gave me the idea of "Unambiguous Chess" where the only moves allowed are those who are determined by the arrival square alone (all ambiguous moves simply forbidden). This was probably a good idea for a problem stipulation (problem composers like strong constraints, which make it easier to avoid dual solutions), but not a good one for a playing variant (actually Unambiguous Chess is a forced win for White under the no-check rule).
Moving from Unambiguous Chess to Ambiguous Chess is not a very big step, still it took me something like five years and happened only when for some reason both Unambiguous Chess and the game of Quarto came to my mind in the same time - Quarto is an alignment game where you choose the piece which the opponent has to place on the board.
There were only two rules which were not obvious to settle, the castling one (argh!) and the promotion one. At first I had the "normal" promotion by the pawn's owner, but then a friend of mine rightly pointed out that it was more logical that the piece was chosen by the opponent, as the different promotions were different moves to the same square. I hope you will agree with this one :-)

24. Mayo 2006, 12:46:23
Chicago Bulls 
Asunto: Re:
nabla: .
.
.
I do not only agree with the promotion choosen by the opponent, but i've changed my mind about the castle rule. I think you've made the correct choice....!
And thanks about the history review.....

24. Mayo 2006, 14:17:46
nabla 
Asunto: Re:
Pythagoras: Cool about castling :-) I will stick with the promotion rule as it is unless it becomes clear that too many endgames are drawn, in which case having the promotion by the owner would be a solution. But it can require a three-step move instead of a two-step one (player A points the promotion square, player B chooses a pawn, player A chooses the promotion piece).

24. Mayo 2006, 17:45:06
nabla 
Asunto: Re:
Pythagoras: Sorry I misread you ! I thought that you disagreed with my promotion rule because I missed the "only" in your first sentence. A more careful reading switched the meaning of your sentence completely :-)

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