[xogo.git] / variants / Baroque / complete_rules.html

<html>
<head>
  <title>Baroque Rules</title>
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  <link href="/variants/Baroque/style.css" rel="stylesheet"/>
</head>
<body>

<div class="full-rules">
<h1>Baroque Rules</h1>

<div>
  <h4>Pieces names</h4>
  <p>Pieces names refer to the way they capture, which is described later.</p>
  <ul>
    <li>Pawn : Pawn or Pincer</li>
    <li>Rook : Coordinator</li>
    <li>Knight : Long Leaper</li>
    <li>Bishop : Chameleon</li>
    <li>Queen : Withdrawer</li>
    <li>King : King (same behavior as in standard chess)</li>
  </ul>
  <p>
    There is also a new piece : the immobilizer,
    represented by an upside-down rook.
  </p>
  <figure>
    <div class="diag"
         data-fen='8/8/4m3/8/8/8/3M4/8 w 0'>
    </div>
    <figcaption>Immobilizers on d2 and e6.</figcaption>
  </figure>
</div>

<div>
  <h3>Non-capturing moves</h3>
  <p>
    Pawns move as orthodox rooks, and the king moves as usual,
    one square in any direction.
    All other pieces move like an orthodox queen.
  </p>
  <p>
    When a piece is adjacent to an enemy immobilizer, it cannot move unless
    the enemy immobilizer is adjacent to a friendly immobilizer or chameleon
    (cancelling the powers of the opponent's immobilizer).
  </p>
  <p>
    Note : this corresponds to the "pure rules" described on
    <a href="http://www.inference.org.uk/mackay/ultima/ultima.html">
      this page
    </a>
    , which slightly differ from the initial rules.
    The aim is to get rid of the weird suicide rule by weakening the
    immobilizers lock. In particular, in the original rules two adjacent
    immobilizer are stuck forever until one is captured. Note that it's still
    the case if all chameleons disappeared.
  </p>
</div>

<div>
  <h3>Capturing moves</h3>
  <p>
    Easy case first: the king captures as usual, by moving onto an adjacent
    square occupied by an enemy piece. But this is the only piece following
    orthodox rules, and also the only one which captures by moving onto an
    occupied square. All other pieces capture passively: they land on a free
    square and captured units are determined by some characteristics of the
    movement.
  </p>
  <p>Note: the immobilizer does not capture.</p>

  <h4>Pawns/Pincers</h4>
  <p>
    If at the end of its movement a pawn is horizontally or vertically adjacent
    to an enemy piece, which itself is next to a friendly piece (in the same
    direction), the "pinced" unit is removed from the board.
  </p>
  <figure>
    <div class="diag"
         data-fen='7k/5ppp/2N5/2n5/3rB3/8/PPP5/K7 w 0'>
    </div>
    <figcaption>1.Pc2c4 captures both coordinator and long leaper.</figcaption>
  </figure>

  <h4>Coordinators (rooks)</h4>
  <p>
    Imagine that rook and king of the same color are two corners of a rectangle
    (this works if these two pieces are unaligned).
    If at the end of a rook move an enemy piece stands in any of the two
    remaining corners, it is captured.
  </p>
  <figure>
    <div class="diag"
         data-fen='8/2b4K/2q5/3p1N1p/8/8/2R5/k7 w 0'>
    </div>
    <figcaption>1.Rc5 captures on c7 and h5.</figcaption>
  </figure>

  <h4>Long leapers (knights)</h4>
  <p>
    A knight captures exactly as a queen in international draughts game: by
    jumping over its enemies, as many times as it can/want but always in the
    same direction. In this respect it is less powerful than a draughts' queen:
    on the following diagram c8 or f6 cannot be captured.
    However, the knight does not have to maximize the number of captured units
    (as is the case in draughts).
  </p>
  <figure>
    <div class="diag"
         data-fen='2n4k/3r4/5b2/3p4/1m6/3b4/3N4/K7 w 0'
         data-marks='d4,d6,d8,a5'>
    </div>
    <figcaption>All marked squares captures are playable from d2.</figcaption>
  </figure>

  <h4>Withdrawer (queen)</h4>
  <p>
    The queen captures by moving away from an adjacent enemy piece, in the
    opposite direction (without jumping, the path must be free).
  </p>
  <figure>
    <div class="diag"
      data-fen="7k/8/8/3Qr3/8/8/8/K7 w 0"
      data-marks="a5,b5,c5">
    </div>
    <figcaption>1.Qa5, 1.Qb5 or 1.Qc5 captures the black rook.</figcaption>
  </figure>

  <h4>Chameleon (bishop)</h4>
  <p>The chameleon captures pieces in the way they would capture. So, it</p>
  <ul>
    <li>pinces pawns (if moving like a pawn),</li>
    <li>withdraws from withdrawers,</li>
    <li>leaps over long leapers,</li>
    <li>coordinates coordinators.</li>
  </ul>
  <p>...and these captures can be combined.</p>
  <p>
    Remark: the move indicated on the diagram doesn't capture the black pincer
    on e5, since it is a diagonal move (not like a pawn).
  </p>
  <figure>
    <div class="diag"
      data-fen="7k/8/8/r3pP2/2n5/8/B7/K7 w 0"
      data-marks="a5,c4">
    </div>
    <figcaption>1.Bd5 captures the two marked pieces.</figcaption>
  </figure>
  <p>
    Besides, chameleon immobilizes immobilizers (but cannot capture them since
    they do not capture).
  </p>
  <p>
    A chameleon captures the king in the same way the king captures, which
    means that a chameleon adjacent to a king gives check.
  </p>
</div>

<div>
  <h3>End of the game</h3>
  <p>
    The game ends by checkmate or stalemate as in standard chess. Note however
    that checks are more difficult to see, because of the exotic capturing
    rules. For example, on the following diagram the white king cannot move to
    e5 because then the black pawn could capture by moving next to it.
  </p>
  <figure>
    <div class="diag"
         data-fen="7k/8/8/p4r/4K3/8/8/8 w 0"
         data-marks="e5">
    </div>
    <figcaption>1.Ke5 is impossible</figcaption>
  </figure>
</div>

<div>
  <h3>More information</h3>
  <p>
    The
    <a href="https://en.wikipedia.org/wiki/Baroque_chess">Wikipedia page</a>
    is a good starting point.
  </p>
</div>

</div>

</body>
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Commit	Line	Data
9a036f5f BA	1	<html>
	2	<head>
	3	<title>Baroque Rules</title>
	4	<link href="/common.css" rel="stylesheet"/>
	5	<link href="/variants/Baroque/style.css" rel="stylesheet"/>
	6	</head>
	7	<body>
	8
	9	<div class="full-rules">
	10	<h1>Baroque Rules</h1>
	11
	12	<div>
	13	<h4>Pieces names</h4>
	14	<p>Pieces names refer to the way they capture, which is described later.</p>
	15	<ul>
	16	<li>Pawn : Pawn or Pincer</li>
	17	<li>Rook : Coordinator</li>
	18	<li>Knight : Long Leaper</li>
	19	<li>Bishop : Chameleon</li>
	20	<li>Queen : Withdrawer</li>
	21	<li>King : King (same behavior as in standard chess)</li>
	22	</ul>
	23	<p>
	24	There is also a new piece : the immobilizer,
	25	represented by an upside-down rook.
	26	</p>
	27	<figure>
	28	<div class="diag"
	29	data-fen='8/8/4m3/8/8/8/3M4/8 w 0'>
	30	</div>
	31	<figcaption>Immobilizers on d2 and e6.</figcaption>
	32	</figure>
	33	</div>
	34
	35	<div>
	36	<h3>Non-capturing moves</h3>
	37	<p>
	38	Pawns move as orthodox rooks, and the king moves as usual,
	39	one square in any direction.
	40	All other pieces move like an orthodox queen.
	41	</p>
	42	<p>
	43	When a piece is adjacent to an enemy immobilizer, it cannot move unless
	44	the enemy immobilizer is adjacent to a friendly immobilizer or chameleon
	45	(cancelling the powers of the opponent's immobilizer).
	46	</p>
	47	<p>
	48	Note : this corresponds to the "pure rules" described on
	49	<a href="http://www.inference.org.uk/mackay/ultima/ultima.html">
	50	this page
	51	</a>
	52	, which slightly differ from the initial rules.
	53	The aim is to get rid of the weird suicide rule by weakening the
	54	immobilizers lock. In particular, in the original rules two adjacent
	55	immobilizer are stuck forever until one is captured. Note that it's still
	56	the case if all chameleons disappeared.
	57	</p>
	58	</div>
	59
	60	<div>
	61	<h3>Capturing moves</h3>
	62	<p>
	63	Easy case first: the king captures as usual, by moving onto an adjacent
	64	square occupied by an enemy piece. But this is the only piece following
65	orthodox rules, and also the only one which captures by moving onto an
66	occupied square. All other pieces capture passively: they land on a free
67	square and captured units are determined by some characteristics of the
68	movement.
69	</p>
70	<p>Note: the immobilizer does not capture.</p>
71
72	<h4>Pawns/Pincers</h4>
73	<p>
74	If at the end of its movement a pawn is horizontally or vertically adjacent
75	to an enemy piece, which itself is next to a friendly piece (in the same
76	direction), the "pinced" unit is removed from the board.
77	</p>
78	<figure>
79	<div class="diag"
80	data-fen='7k/5ppp/2N5/2n5/3rB3/8/PPP5/K7 w 0'>
81	</div>
82	<figcaption>1.Pc2c4 captures both coordinator and long leaper.</figcaption>
83	</figure>
84
85	<h4>Coordinators (rooks)</h4>
86	<p>
87	Imagine that rook and king of the same color are two corners of a rectangle
88	(this works if these two pieces are unaligned).
89	If at the end of a rook move an enemy piece stands in any of the two
90	remaining corners, it is captured.
91	</p>
92	<figure>
93	<div class="diag"
94	data-fen='8/2b4K/2q5/3p1N1p/8/8/2R5/k7 w 0'>
95	</div>
96	<figcaption>1.Rc5 captures on c7 and h5.</figcaption>
97	</figure>
98
99	<h4>Long leapers (knights)</h4>
100	<p>
101	A knight captures exactly as a queen in international draughts game: by
102	jumping over its enemies, as many times as it can/want but always in the
103	same direction. In this respect it is less powerful than a draughts' queen:
104	on the following diagram c8 or f6 cannot be captured.
105	However, the knight does not have to maximize the number of captured units
106	(as is the case in draughts).
107	</p>
108	<figure>
109	<div class="diag"
110	data-fen='2n4k/3r4/5b2/3p4/1m6/3b4/3N4/K7 w 0'
111	data-marks='d4,d6,d8,a5'>
112	</div>
113	<figcaption>All marked squares captures are playable from d2.</figcaption>
114	</figure>
115
116	<h4>Withdrawer (queen)</h4>
117	<p>
118	The queen captures by moving away from an adjacent enemy piece, in the
119	opposite direction (without jumping, the path must be free).
120	</p>
121	<figure>
122	<div class="diag"
123	data-fen="7k/8/8/3Qr3/8/8/8/K7 w 0"
124	data-marks="a5,b5,c5">
125	</div>
126	<figcaption>1.Qa5, 1.Qb5 or 1.Qc5 captures the black rook.</figcaption>
127	</figure>
128
129	<h4>Chameleon (bishop)</h4>
130	<p>The chameleon captures pieces in the way they would capture. So, it</p>
131	<ul>
132	<li>pinces pawns (if moving like a pawn),</li>
133	<li>withdraws from withdrawers,</li>
134	<li>leaps over long leapers,</li>
135	<li>coordinates coordinators.</li>
136	</ul>
137	<p>...and these captures can be combined.</p>
138	<p>
139	Remark: the move indicated on the diagram doesn't capture the black pincer
140	on e5, since it is a diagonal move (not like a pawn).
141	</p>
142	<figure>
143	<div class="diag"
144	data-fen="7k/8/8/r3pP2/2n5/8/B7/K7 w 0"
145	data-marks="a5,c4">
146	</div>
147	<figcaption>1.Bd5 captures the two marked pieces.</figcaption>
148	</figure>
149	<p>
150	Besides, chameleon immobilizes immobilizers (but cannot capture them since
151	they do not capture).
152	</p>
153	<p>
154	A chameleon captures the king in the same way the king captures, which
155	means that a chameleon adjacent to a king gives check.
156	</p>
157	</div>
158
159	<div>
160	<h3>End of the game</h3>
161	<p>
162	The game ends by checkmate or stalemate as in standard chess. Note however
163	that checks are more difficult to see, because of the exotic capturing
164	rules. For example, on the following diagram the white king cannot move to
165	e5 because then the black pawn could capture by moving next to it.
166	</p>
167	<figure>
168	<div class="diag"
169	data-fen="7k/8/8/p4r/4K3/8/8/8 w 0"
170	data-marks="e5">
171	</div>
172	<figcaption>1.Ke5 is impossible</figcaption>
173	</figure>
174	</div>
175
176	<div>
177	<h3>More information</h3>
178	<p>
179	The
180	<a href="https://en.wikipedia.org/wiki/Baroque_chess">Wikipedia page</a>
181	is a good starting point.
182	</p>
183	</div>
184
185	</div>
186
187	</body>
188	<script src="/utils/drawDiagrams.js"></script>
189	<script>fenToDiag("Baroque");</script>
190	</html>