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1<html>
2<head>
3 <title>Dynamo Rules</title>
4 <link href="/common.css" rel="stylesheet"/>
5 <link href="/variants/Dynamo/style.css" rel="stylesheet"/>
6</head>
7<body>
8<div class="full-rules">
9<h1>Dynamo Rules</h1>
10
11<p>
12 Pieces have the same movement as in orthodox chess, but they cannot
13 take other pieces in the usual way. Instead of the normal captures, pieces
14 can pull or push other pieces, potentially off the board.
15 The goal is to send the enemy king off the board.
16</p>
17
18<p>Each turn, a player has the following options:</p>
19<ul>
20 <li>
21 Move one of his pieces normally, then optionally pull something as an
22 effect of this move.
23 </li>
24 <li>
25 Push any piece with one of his pieces, then optionally follow the pushed
26 piece.
27 </li>
28
29<p>
30 It seems easier to understand with some examples. For a detailed
31 introduction please visit
32 <a href="https://echekk.fr/spip.php?page=article&id_article=599">
33 this page
34 </a> (in French).
35</p>
36
37<figure>
38 <div class="diag"
39 data-fen='rnbqkbnr/pppppppp/8/8/8/8/PPPPPPPP/RNBQKBNR ...'
40 data-mks="e1,e3,e4,c3,f3,g4,h5,d3,c4,b5,a6">
41 </div>
42 <figcaption>Possible "pawn moves" in the initial position.</figcaption>
43</figure>
44
45<p>
46 The e2 pawn can move to e3 and e4 as usual. It can also slide diagonally,
47 being pushed by the bishop or the queen (which may or may not move along
48 this line afterward). It can also go to c3, being pushed by the knight from
49 g1; then the knight can move to e2, or stay motionless.
50 Finally, the pawn can "take the king": this is a special move indicating that
51 you want it to exit the board. Indeed it could be pushed off the board by the
52 bishop or the queen.
53</p>
54
55<p>
56 Note: if an action is possible but you don't want to play a second part in
57 a move, click on any empty square: this will send an empty move.
58</p>
59
60<figure>
61 <div class="diag left"
62 data-fen='rnbqkbnr/ppp1pppp/8/3p4/8/2N5/PPPPPPPP/R1BQKBNR ...'>
63 </div>
64 <div class="diag right"
65 data-fen='rnbqkbnr/ppp1pppp/8/8/8/2p5/PPPPPPPP/RNBQKBNR ...'>
66 </div>
67 <figcaption>
68 Pulling the d5 pawn to c3 (left: before, right: after).
69 </figcaption>
70</figure>
71
72<ul>
73 <li>Pawns cannot pull (because they only move forward).</li>
74 <li>
75 When they could reach the square beyond the edge,
76 pieces can exit the board by themselves, possibly dragging another piece
77 out (friendly or enemy).
78 </li>
79</ul>
80
81<figure>
82 <div class="diag"
83 data-fen='rnb1qbnr/pppkpppp/3p4/8/Q1P5/5NP1/PP1PPP1P/RNB1KB1R ...'>
84 </div>
85 <figcaption>
86 Check: the queen threatens to pull the king off the board
87 along the a4-e8 diagonal.
88 </figcaption>
89</figure>
90
91<p>
92 It is forbidden to undo a "move + action". For example here, white could
93 push back the black bishop on g7 but not return to d4 then.
94</p>
95
96<figure>
97 <div class="diag left"
98 data-fen='rnbqk1nr/ppppppbp/6p1/8/3B4/1P6/P1PPPPPP/RN1QKBNR ...'>
99 </div>
100 <div class="diag right"
101 data-fen='rnbqk1nr/pppppp1p/6p1/8/3b4/1P6/PBPPPPPP/RN1QKBNR ...'>
102 <figcaption>
103 Pushing the d4 bishop to b2 (left: before, right: after).
104 </figcaption>
105</figure>
106
107<p>
108 Castling is possible as long as the king and rook have not moved and
109 haven't been pushed or pulled (this differs from the chessvariants
110 description).
111</p>
112
113<h3>End of the game</h3>
114
115<p>
116 The game ends when a push or pull action threatens to send the king off the
117 board, and he has no way to escape it.
118</p>
119
120<figure>
121 <div class="diag"
122 data-fen='8/4B3/8/8/6Qk/8/4N3/K7 ...'>
123 </div>
124 <figcaption>Dynamo checkmate ("Dynamate" :) )</figcaption>
125</figure>
126
127<p>
128 The king cannot "take" on g4: this would just push the queen one step to the
129 left, and she would then push the king beyond the 'h' file.
130 There are no en-passant captures.
131</p>
132
133<h3>Source</h3>
134
135<p>
136 <a href="https://www.chessvariants.com/mvopponent.dir/dynamo.html">
137 Dynamo chess
138 </a>
139 on chessvariants.com. The short description given on
140 <a href="http://www.pion.ch/echecs/variante.php?jeu=dynamo">this page</a>
141 might help too.
142</p>