X-Git-Url: http://winboard.nl/cgi-bin?a=blobdiff_plain;f=whats_new%2Frules%2FCWDA.html;h=ba2de2fe775a397d9692ca03945b388c5c310fb7;hb=df72269570b1c8a4bdd34319739006d7eebfb5d0;hp=cc82970af664c3e61cb06df9626640589398776f;hpb=be72e93f24deb4914ca08c698b6c0b536c2961ee;p=xboard.git
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-
-
-Chess with Different Armies
-
-
-
-
-
Chess with Different Armies
-
-This is actually a group of variants.
-It defines a number of 'armies', each containing of an orthodox King and Pawns,
-plus 7 other pieces of 4 different types.
-The orthodox FIDE army, with pieces Q, R, B and N, is one example of this.
-But there are many armies considting of four completely different pieces,
-together of approximately equal strength as the FIDE army.
-Here we discuss three possible realizations of this.
-
-
-Each of these four armies can be pitted against each of the others,
-with either color.
-
Sliding capture or non-capture, can be blocked on any square along the ray
-
-
-
-
-
-
-
-
-
-
-
-
-
-
-
-
-
-
-
-
-
-
-
-
-
-
-
+
+ Chess with Different Armies
+
+
+
+
+
-
+
Chess with Different Armies
-
+
This is actually a group of variants. It defines a number of
+ 'armies', each containing of an orthodox King and Pawns, plus 7
+ other pieces of 4 different types. The orthodox FIDE army, with
+ pieces Q, R, B and N, is one example of this. But there are many
+ armies considting of four completely different pieces, together
+ of approximately equal strength as the FIDE army. Here we discuss
+ three possible realizations of this.
-
+
Each of these four armies can be pitted against each of the
+ others, with either color.
-Promotes to any piece specific to the army on reaching last rank
-
-FIDE army
-
-Queen
-
-Q
-
-9.5
-
-RB or Q
-
-
-
-Rook
-
-R
-
-5
-
-R
-
-
-
-Bishop
-
-B
-
-3.25
-
-B
-
-Color-bound
-
-Knight
-
-N
-
-3.25
-
-N
-
-
-
-Clobberers army
-
-Archbishop
-
-A
-
-8.75
-
-BN
-
-
-
-Leaping Bishop
-
-L
-
-5
-
-BD
-
-Color-bound
-
-Clobberer
-
-C
-
-4.5
-
-FAD
-
-Color-bound
-
-Elephant
-
-E
-
-3
-
-WA
-
-
-
-Nutters army
-
-Colonel
-
-C
-
-9.5
-
-fRsRKfhN
-
-
-
-Turret
-
-T
-
-5
-
-bKfsR
-
-
-
-Unicorn
-
-B
-
-3.75
-
-fhNbsK
-
-
-
-Horse
-
-H
-
-3
-
-FbbNffN
-
-
-
-Rookies army
-
-Marshall
-
-M
-
-9
-
-RN
-
-
-
-Short Rook
-
-S
-
-4.5
-
-R4
-
-
-
-Half Duck
-
-B
-
-4
-
-HFD
-
-
-
-Woody
-
-W
-
-3
-
-WD
-
-
-
-
Pawn peculiarities
-
-
Pawns capture differently from how they move (straight move, diagonal capture).
-
Pawns can move two squares straight ahead from their initial position, provided they are not blocked.
-
On the move immediately after such a double push, they can be captured en passant by another Pawn,
-as if they had only moved 1 square ahead.
-
Pawns promote to another (non-royal) piece of choice from their own army when they reach last rank.
-
-
Castling
-
-A King that has not moved before can (in general) move two squares in the direction of a corner piece that has not moved before,
-in which case that corner piece is moved to the square next to the King on the other side.
-This is only allowed if all squares traveled through by King and corner piece are empty (after their removal),
-when the King is not in check on the square it came from,
-and would not be in check on any of the squares it skipped over.
-When the corner piece is color-bound, however, the King moves 2 or 3 squares, subject to all other rules mentioned above,
-to make sure the piece it castles with stays on the same color.
-
-
General rules
-
-
Any army can be pitted against any other.
-
It is not allowed to expose your King to check.
-
The game is won by checkmating the opponent's King.
-
Stalemate (no legal moves, but not in check) is a draw.
-
-
XBoard interface issues
-
-Man of the pieces in the various army are quite exotic even by the standards of Chess variants,
-and XBoard does not know them.
-So Chess with different Armies has to be played with legality testing off,
-using pieces XBoard does implement for different purposes.
-CwDA is also not an variant name known to XBoard;
-it has to be played as the catch-all variant 'fairy'.
-This variant can mean anything as far as XBoard is concerned;
-you have to tell the engine what you actually want to play,
-and then the engine will tell it to XBoard (i.e. which piece symbols to use, in which initial setup).
-So CwDA cannot be played without an engine that knows how to play it.
-
-
-Fairy-Max implements various versions of CwDA.
-With a combobox in the Engine Settings dialog you can select which version you want to play
-(e.g. Clobberers-Nutters) as variant fairy.
-When you then select 'fairy' from the New Variant dialog
-(or start a New Game when 'fairy' was already selected)
-the engine will setup the game for the selected armies.
-
-
Differences with FIDE
-
-Except for the FIDE army, all armies consist of pieces (not King and Pawns) that move in completely different ways.
-
-
Strategy issues
-
-It is not possible to force checkmate on a bare King with just a single Bishop or Knight (in addition to your own King).
-Two Knights cannot do that either.
-It is not possible to force checkmate on a bare King with just a single Elephant or C or L (in addition to your own King).
-A pair CC, LL or CL on unlike colors can force checkmate without help of their King.
-A pair of Elephants can checkmate with help of their King.
-It is not possible to force checkmate on a bare King with just a single Fibnif or a pair of them (in addition to your own King).
-All pieces of the Rookies army can force checkmate against a bare King.
-
-
-Bishops, C and L are confined to squares of a single color.
-Having Bishops on both colors compensates this weakness, and is worth an extra 0.5 on top of their added value.
-Combining other color-bound pieces on unlike colors is expected to involve even larger bonuses.
-
Promotes to any piece specific to the army on reaching
+ last rank
+
+
+
+
FIDE army
+
+
+
+
Queen
+
+
Q
+
+
9.5
+
+
RB or Q
+
+
+
+
+
+
Rook
+
+
R
+
+
5
+
+
R
+
+
+
+
+
+
Bishop
+
+
B
+
+
3.25
+
+
B
+
+
Color-bound
+
+
+
+
Knight
+
+
N
+
+
3.25
+
+
N
+
+
+
+
+
+
Clobberers army
+
+
+
+
Archbishop
+
+
A
+
+
8.75
+
+
BN
+
+
+
+
+
+
Leaping Bishop
+
+
L
+
+
5
+
+
BD
+
+
Color-bound
+
+
+
+
Clobberer
+
+
C
+
+
4.5
+
+
FAD
+
+
Color-bound
+
+
+
+
Elephant
+
+
E
+
+
3
+
+
WA
+
+
+
+
+
+
Nutters army
+
+
+
+
Colonel
+
+
C
+
+
9.5
+
+
fRsRKfhN
+
+
+
+
+
+
Turret
+
+
T
+
+
5
+
+
bKfsR
+
+
+
+
+
+
Unicorn
+
+
B
+
+
3.75
+
+
fhNbsK
+
+
+
+
+
+
Horse
+
+
H
+
+
3
+
+
FbbNffN
+
+
+
+
+
+
Rookies army
+
+
+
+
Marshall
+
+
M
+
+
9
+
+
RN
+
+
+
+
+
+
Short Rook
+
+
S
+
+
4.5
+
+
R4
+
+
+
+
+
+
Half Duck
+
+
B
+
+
4
+
+
HFD
+
+
+
+
+
+
Woody
+
+
W
+
+
3
+
+
WD
+
+
+
+
+
+
Pawn peculiarities
+
+
+
Pawns capture differently from how they move (straight
+ move, diagonal capture).
+
+
Pawns can move two squares straight ahead from their
+ initial position, provided they are not blocked.
+
+
On the move immediately after such a double push, they can
+ be captured en passant by another Pawn, as if they had only
+ moved 1 square ahead.
+
+
Pawns promote to another (non-royal) piece of choice
+ from their own army when they reach last rank.
+
+
+
Castling
+
+
A King that has not moved before can (in general) move two
+ squares in the direction of a corner piece that has not moved
+ before, in which case that corner piece is moved to the square
+ next to the King on the other side. This is only allowed if all
+ squares traveled through by King and corner piece are empty
+ (after their removal), when the King is not in check on the
+ square it came from, and would not be in check on any of the
+ squares it skipped over. When the corner piece is color-bound,
+ however, the King moves 2 or 3 squares, subject to all
+ other rules mentioned above, to make sure the piece it castles
+ with stays on the same color.
+
+
General rules
+
+
+
Any army can be pitted against any other.
+
+
It is not allowed to expose your King to check.
+
+
The game is won by checkmating the opponent's King.
+
+
Stalemate (no legal moves, but not in check) is a
+ draw.
+
+
+
XBoard interface issues
+
+
Man of the pieces in the various army are quite exotic even by
+ the standards of Chess variants, and XBoard does not know them.
+ So Chess with different Armies has to be played with legality
+ testing off, using pieces XBoard does implement for different
+ purposes. CwDA is also not an variant name known to XBoard; it
+ has to be played as the catch-all variant 'fairy'. This variant
+ can mean anything as far as XBoard is concerned; you have to tell
+ the engine what you actually want to play, and then the engine
+ will tell it to XBoard (i.e. which piece symbols to use, in which
+ initial setup). So CwDA cannot be played without an engine that
+ knows how to play it.
+
+
Fairy-Max implements various versions of CwDA. With a combobox
+ in the Engine Settings dialog you can select which version you
+ want to play (e.g. Clobberers-Nutters) as variant fairy. When you
+ then select 'fairy' from the New Variant dialog (or start a New
+ Game when 'fairy' was already selected) the engine will setup the
+ game for the selected armies.
+
+
Differences with FIDE
+
+
Except for the FIDE army, all armies consist of pieces (not
+ King and Pawns) that move in completely different ways.
+
+
Strategy issues
+
+
It is not possible to force checkmate on a bare King with just
+ a single Bishop or Knight (in addition to your own King). Two
+ Knights cannot do that either. It is not possible to force
+ checkmate on a bare King with just a single Elephant or C or L
+ (in addition to your own King). A pair CC, LL or CL on unlike
+ colors can force checkmate without help of their King. A pair of
+ Elephants can checkmate with help of their King. It is not
+ possible to force checkmate on a bare King with just a single
+ Fibnif or a pair of them (in addition to your own King). All
+ pieces of the Rookies army can force checkmate against a bare
+ King.
+
+
Bishops, C and L are confined to squares of a single color.
+ Having Bishops on both colors compensates this weakness, and is
+ worth an extra 0.5 on top of their added value. Combining other
+ color-bound pieces on unlike colors is expected to involve even
+ larger bonuses.
-
-
- 
- 
- 
- 
- 
- 
- 
- 
- 
- 
- 
- 
- 
- 
- 
- 
- 
- 
- 
- 
- 
- 
- 
-