Better behavior in Dynamo. Some image attributions in rules
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1 p.boxed.
2 Moves are potentially played in two times: move a piece,
3 and / or push or pull something with that unit.
4
5 p.
6 Pieces have the same movement as in orthodox chess, but they cannot
7 take other pieces in the usual way. Instead of the normal captures, pieces
8 can pull or push other pieces, potentially off the board.
9 The goal is to send the enemy king off the board.
10
11 p Each turn, a player has the following options:
12 ul
13 li.
14 Move one of his pieces normally, then optionally pull something as an
15 effect of this move.
16 li.
17 Push any piece with one of his pieces, then optionally follow the pushed
18 piece.
19
20 p
21 | It seems easier to understand with some examples. For a detailed
22 | introduction please visit
23 a(href="https://echekk.fr/spip.php?page=article&id_article=599") this page
24 |  (in French).
25
26 figure.diagram-container
27 .diagram
28 | fen:rnbqkbnr/pppppppp/8/8/8/8/PPPPPPPP/RNBQKBNR e1,e3,e4,c3,f3,g4,h5,d3,c4,b5,a6:
29 figcaption Possible "pawn moves" in the initial position.
30
31 p.
32 The e2 pawn can move to e3 and e4 as usual. It can also slide diagonally,
33 being pushed by the bishop or the queen (which may or may not move along
34 this line afterward). It can also go to c3, being pushed by the knight from
35 g1; then the knight can move to e2, or stay motionless.
36 Finally, the pawn can "take the king": this is a special move indicating that
37 you want it to exit the board. Indeed it could be pushed off the board by the
38 bishop or the queen.
39
40 p.
41 Note: if an action is possible but you don't want to play a second part in
42 a move, click on any empty square: this will send an empty move.
43
44 figure.diagram-container
45 .diagram.diag12
46 | fen:rnbqkbnr/ppp1pppp/8/3p4/8/2N5/PPPPPPPP/R1BQKBNR:
47 .diagram.diag22
48 | fen:rnbqkbnr/ppp1pppp/8/8/8/2p5/PPPPPPPP/RNBQKBNR:
49 figcaption Pulling the d5 pawn to c3 (left: before, right: after).
50
51 ul
52 li Pawns cannot pull (because they only move forward).
53 li.
54 When they could reach the square beyond the edge,
55 pieces can exit the board by themselves, possibly dragging another piece
56 out (friendly or enemy).
57
58 figure.diagram-container
59 .diagram
60 | fen:rnb1qbnr/pppkpppp/3p4/8/Q1P5/5NP1/PP1PPP1P/RNB1KB1R:
61 figcaption.
62 Check: the queen threatens to pull the king off the board along the a4-e8
63 diagonal.
64
65 p.
66 It is forbidden to undo a "move + action". For example here, white could
67 push back the black bishop on g7 but not return to d4 then.
68
69 figure.diagram-container
70 .diagram.diag12
71 | fen:rnbqk1nr/ppppppbp/6p1/8/3B4/1P6/P1PPPPPP/RN1QKBNR:
72 .diagram.diag22
73 | fen:rnbqk1nr/pppppp1p/6p1/8/3b4/1P6/PBPPPPPP/RN1QKBNR:
74 figcaption Pushing the d4 bishop to b2 (left: before, right: after).
75
76 p.
77 Castling is possible as long as the king and rook have not moved and
78 haven't been pushed or pulled (this differs from the chessvariants
79 description).
80
81 h3 End of the game
82
83 p.
84 The game ends when a push or pull action threatens to send the king off the
85 board, and he has no way to escape it.
86
87 figure.diagram-container
88 .diagram
89 | fen:8/4B3/8/8/6Qk/8/4N3/K7:
90 figcaption Dynamo checkmate ("Dynamate" :) )
91
92 p.
93 The king cannot "take" on g4: this would just push the queen one step to the
94 left, and she would then push the king beyond the 'h' file.
95 There are no en-passant captures.
96
97 h3 Source
98
99 p
100 a(href="https://www.chessvariants.com/mvopponent.dir/dynamo.html")
101 | Dynamo chess
102 |  on chessvariants.com. The short description given on
103 a(href="http://www.pion.ch/echecs/variante.php?jeu=dynamo") this page
104 |  might help too.
105
106 p Inventors: Hans Kluever and Peter Kahl (1968)