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Seirawan Chess. Normal rules, except two extra pieces can be introduced: Hawk and Elephant (with zrf).[All Comments] [Add Comment or Rating]
M Winther wrote on 2015-01-10 UTC
I never claimed that one can gate more than one piece per time. I don't know what is so unclear with my description of the rules. Just follow the correct rules and play on my preset. It works fine. /Mats

H. G. Muller wrote on 2015-01-10 UTC
That is not true. The official rules of S-Chess say you can only gate one piece per move. And you must not 'pass through check' between moving and dropping, i.e. you cannot gate something with a pinned piece, even though the piece you are gating will block the check.

Carlos Cetina wrote on 2015-01-10 UTC
When castling players should have 7 choices:

1) Drop Chancellor on e1/e8
2) Drop Chancellor on h1/h8
3) Drop Archbishop on e1/e8
4) Drop Archbishop on h1/h8
5) Drop Chancellor on e1/e8 and Archbishop on h1/h8
6) Drop Archbishop on e1/e8 and Chancellor on h1/h8
7) Not to drop neither

So, Mats, I suggest you to introduce the two extra choices in the preset codification.

M Winther wrote on 2015-01-10 UTC
Spengler, whenever a piece moves from its initial square, the player is
free to insert an extraneous piece, if he so wishes. If he moves all pieces
from their initial squares without introducing any of the extraneous
pieces, then he has forfeited his right to introduce them. 

Castling is a double move, when the king moves from its initial square and
the rook moves from its initial square. So it is essentially the same as
all the other moves, except that here the player has a choice. He can place
an extraneous piece on either the corner square or the king square. I see
no problem in the description of the rules.

Georg Spengler wrote on 2015-01-09 UTC
"If the player moves ALL his pieces from the first rank without placing one or both in hand pieces, he forfeits the right to do so" Aah!

That's from Wikipedia.

If only all my problems would solve that easily

Georg Spengler wrote on 2015-01-09 UTC
"Whenever a piece leaves its initial square, one of the extra pieces can
immediately be introduced to the vacant square. So this is a double move,
comparable to castling. Should a player refrain from inserting his extra
pieces at these occasions, then he has forfeited his chance of introducing
them." - Ok. - "When castling, one of the extra pieces can be placed on
either of the squares left vacant" - Isn't that a contradiction?

Before you castle you have to move two pieces at least. That means to me,
you have already defeated your right to insert them.

What do I misunderstand

M Winther wrote on 2011-02-03 UTC
I now decided it was time to release my Zillions S-chess program here:
It also includes a variant with an 'improvement' of the rules.

By the way, there is an ongoing Yoos vs. the World S-chess game here:

M Winther wrote on 2010-12-24 UTC
I have now used the new 'ask' command, and the 'askpromote' command, to automatize Seirawan Chess and the introduction of external pieces. I would appreciate if you did some bug testing.

M Winther wrote on 2010-11-23 UTC
As people are playing Seirawan Chess on an awkward preset, I
have created a new one here. It validates moves, and the not yet
introduced pieces are visible. May I suggest to the editors
that the older one is removed, after all play on it is finished?

Rich Hutnik wrote on 2008-04-23 UTC
How exactly do the reserves come onto the board?  Also, you need to confirm with Mr. Seirawan and Harper whether or not they would allow any adaptations of it in any other place besides where they want.

You are free to end up doing my IAGO Chess if you like, in its many varieties.

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