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Comments by João Neto

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Mutators. Article discussing the concept of Mutators.
João Neto wrote on 2008-05-26 UTC
```Hi Richard.

Thanks for that taxonomic work. The harder part is too make those concepts glue together. How to translate those ideas into types and how to compose those types into a game.```

joaopedroneto wrote on 2008-05-26 UTC
```Hi Ji!

I'm not sure if we would like to see the board as a separate entity from
the game pieces. It must be thought over. A board can be seen as a set or
lattice of special pieces, that for most games are idle, neutral and
non-interactive, but in some games they interact. Some games allow players
to move cell boards, or cells can be removed (like in Zertz), or cells act
over pieces (like games with different terrains)...```

João Neto wrote on 2008-05-23 UTC
A mutator language must be typed. Not all mutators go with each other. Some mutators deal with turns (like progressive mutators), others deal with pieces (eg, apply [Real] to chess king], and so on... This should ease the job of the programmer as well as the language designer.

The Central Squares. 3d chess variant where all three levels share their central squares. (6x6x3, Cells: 100)
joaopedroneto wrote on 2006-05-05 UTC
Joe, you are right about saying that the central sqs are simultaneous on all 3 levels. That's why the knight cannot move up and down on those central sqs. The only moves that the knight can do inside that area is move orthogonally then right/left/up or down: these are the combinations that provide the move range on the diagram.

joaopedroneto wrote on 2006-05-04 UTC
To understand the knight move, you must think 3D. The L move of a chess knight can be (a) just orthogonal (eg, vertical then horizontal), (b) orthogonal then up/down, (c) up/down then orthogonal. That's why the knight has a lot more moves than expected.

The same happens with the Bishop (they can move diagonally up/down) or the Rook (they can move up/down besides orthogonally)

joaopedroneto wrote on 2006-05-03 UTC
```The basic idea is that those 3x3 central squares are shared by all board
levels, so a piece inside one of those squares can move as if it was in
any of those 3 boards. Eg, a Rook in d3 can move as it was in board A,
board B or board C.

That's why the move capabilities inside the central squares provide much
more power to any piece there.```

Connect Chess. Players win by forming a link between the first and last ranks of the board. (8x8, Cells: 64)
João Neto wrote on 2006-01-18 UTC
[I just saw this question now] Indeed that situation was not specified by the original rules. I would say: (a) if a player forms a friendly link and also an enemy link, he wins; (b) if he forms just an enemy link, he loses.

David Pritchard. Death notice.
João Neto wrote on 2006-01-03 UTC
```David Pritchard's death is a loss (every death is) but his work on chess
variants is very much alive and, hopefully, will continue to be fruitful
for a long time.

I feel that chessvariants.org and its community of users (the only ones
that give some meaning to this collection of information) is a remarkable
tribute to his previous, pre-internet work, 'the Encyclopedia of Chess
Variants'. May our interest be a persistent thank you.```

Swap Chess. A move can consist of a series of pieces swapping places. (8x8, Cells: 64)
João Neto wrote on 2006-01-03 UTC
```>did you consider the basic one-step swap which I described in Switching
>Chess?

To be honest, I don't remember :-) But I guess not, usually I tend to
create faster games that FIDE chess, and by allowing just one move per
turn (which might be a swap) my intuition tells me that it would be harder
to mate a swapping king (of course, I may be wrong). Anyway, I don't
recall ever tried the rules of Switching Chess on my chess ruminations.

>I described Switching Chess before I knew of Swap Chess or Balanced Swap

>Chess, however, I later found an applet by Ed Friedlander called Swap
>Chess 1 that is almost identical to Switching Chess and predated it,
>yet it is not attributed to you.

I suppose Ed Friedlander read about swap chess here at chessvariants.org.
He has applets of other games of mine (like magnetic or capture-the-flag
chess). I think that applet implements Balanced Swap Chess.

>I guess I am not sure about the originality of Switching Chess vis-a-vis
>Swap Chess.

This seems a case of convergent invention. The idea is too simple and will
probably be 'found' many other times. Eventually, it was already invented
before 1998.

Cheers,```

João Neto wrote on 2006-01-03 UTC
```Your rule seems appropriate. These original rules create too much havoc on
the position, and make medium-term strategies difficult to plan.

At that time, I start playing a better variant of the same idea: Balanced
Swap Chess (http://www.chessvariants.org/diffmove.dir/balancedswap.html).
In this variant, the moving ability is much more constrained: only one
swap per move.

Thanks for your comments! If you like to try a game of balanced swap
chess, email me.```

Abstract Chess. Pieces are represented by stacks of different heights.
João Neto wrote on 2004-07-22 UTC
```Well, 14 knights is indeed a powerful army, but takes time to make it.
The other player may develop is own pieces in comfortable positions. But
that's the spirit of abchess, see the position and reshape your own army
accordingly.```

João Neto wrote on 2004-07-21 UTC
```That's a good idea. But it probably would mean that both players would try
to keep their queens near an adjacent piece, so they can create a new King
while demoting the previous King (if attacked) to a queen and escape the
attack. And this tactic could continue in a cycle.

Usually, I don't like this type of thing (ie, multiple Kings, demoting
royal pieces, ...).```

Switching Chess. In addition to normal moves, switch with an adjacent friendly piece. (8x8, Cells: 64)
João Neto wrote on 2004-07-20 UTC
```Even with Greg's extra rule, I think the game will create many passive
positions. You could restrict the switch option to non-royal pieces, so
the King could not switch (and so, couldn't easily escape eventual
attacks).

Also, check Swap Chess (www.chessvariants.com/diffmove.dir/swap.html) as a
similar CV concept.```

Towers Chess. Win by pushing towers to the Kings' squares. (8x8, Cells: 64)
João Neto wrote on 2004-06-25 UTC
```I didn't understand the winning condition. How the game ends?

If the goal is stated in a sufficient abstract way, this may be a general
mutator for games with movement.```

The Hitchhiker's Guide to Chess - Part II. Several chess variants in the context of a Socratic dialog.
João Neto wrote on 2004-06-17 UTC
Not yet... Only the future may tell you for sure :-)

Slide Chess . Variant on 44 squares with moving cages.
João Neto wrote on 2004-06-15 UTC
```The 1st point (check using a cage insertion) is correct.

However, the 2nd point may happen. A pawn inside a cage can be promoted by
an insertion. Check the comments in the game webpage.

Once again, thanks for your work on the ZRF :-)```

Slide-Chess. Variant on 44 squares with moving cages. (7x8, Cells: 44)
João Neto wrote on 2004-06-09 UTC
```yes, that's right.

Inside the cages they are in a non-zone regarding promotions, as the
typical place inside most companies :-)```

João Neto wrote on 2004-06-09 UTC
```the pawn can be inside a cage, eg:

8    [O] ( )
7   . n b k b n r
6   . p p p p p p
5   . . . . . . .
4   . . . . . . .
3   . O O O O O O
2   R N B K B N R
1
a b c d e f g h i

now, if that cage is inserted into the board, the pawn will be at the last
row and will be promoted. Since the cage may belong to the adversary, it is
the mover that decides the promotion, not the owner```

João Neto wrote on 2004-06-04 UTC
```Hi, indeed Roberto got it right in his ZRF.

The idea is that the remaining sliding square should not be at the
opposite edge (so, it will not go out of bounds). Both sliding squares
must be diagonally or orthogonally adjacent to the main 6x7 board.

The last pushed square on the 6x7 board can have pieces, except a King.

Sorry about the wording, natural language can be though :-)

Joao Neto```

Slide Chess . Variant on 44 squares with moving cages.
João Neto wrote on 2004-05-16 UTC
```Hi Antoine

I wish to thank you to implement Slide Chess.

One problem: Each cage begins on the last player row, you must switch
cages in the setup (this is to avoid direct attacks to the enemy tower)```

The Central Squares. 3d chess variant where all three levels share their central squares. (6x6x3, Cells: 100)
João Neto wrote on 2003-03-20 UTC
I made that game a long time ago (2-3 years) but I think that you could have a Queen just if you promote a pawn. In the setup, the Queen is too powerful on such small board.