client/src/translations/rules/Chess960/en.pug

   1 p.boxed
   2     | Orthodox rules (with shuffled starting position).
   3
   4 p.
   5     Chess is played between two players, one moving the white pieces and the other
   6     the black pieces. A "move" consists of a piece's movement on the board.
   7     White and black moves alternate until a specific situation occurs (checkmate,
   8     stalemate, or draw criteria met; this is detailed later).
   9     White pieces' player always make the first move.
  10
  11 p.
  12     Each piece has a particular way to move, but almost always captures by moving to an
  13     occupied square (with only one exception, detailed later).
  14
  15 figure.diagram-container
  16     .diagram
  17         | fen:rnbqkbnr/pppppppp/8/8/8/8/PPPPPPPP/RNBQKBNR:
  18     figcaption Standard initial position.
  19
  20 p.
  21     Board coordinates: squares are identified by a couple (letter, number).
  22     The letter starts from 'a' and indicates the column, while the number starts
  23     at 1 and indicates the row.
  24     Since the chessboard is 64 squares, 8x8, this results in a coordinates system
  25     from a1 to h8. 'a1' is the bottom left corner square from the white pieces
  26     player perspective, while 'h8' is in the upper right corner.
  27
  28 h3 Regular moves
  29
  30 h4 Pawns
  31
  32 p.
  33     They are the weakest units on board, but the most complex to move.
  34     From their initial rank they can either jump two squares forward (vertically),
  35     or advance only one square in this same direction. After that first move they
  36     only advance one square at a time, vertically, moving up.
  37
  38 p.
  39     Pawns capture by moving forward (upper on the board) one square diagonally,
  40     when an enemy piece sits on that square.
  41
  42 p.
  43     When reaching the last rank, pawns must promote into any (friendly)
  44     other non-royal piece: queen, rook, knight or bishop.
  45
  46 p.
  47     Moves notations: "pawn" is implicit, so for a simple move we only write the
  48     destination square (because only one pawn at most can move forward to a specific
  49     square). Thus, 1.e5 means "pawn from e4 to e5". However, in case of captures
  50     the situation could be ambiguous (two pawns on the same rank), so the column
  51     is specified too: "fxe6" (for example).
  52     As you can see capture is marked by a cross symbol: "x".
  53
  54 figure.diagram-container
  55     .diagram
  56         | fen:k7/8/8/1prp4/1P1P4/8/6P1/7K:
  57     figcaption Possible pawn moves: g3, g4, dxc5, bxc5
  58
  59 p
  60     | For a piece movement, we just prepend the upper-case piece initial before the
  61     | previously described notation. A rook taking something on f3 square writes:
  62     | Rxf3. There are rules for ambiguous situation, but discussing them now would
  63     | be too far off-topic. Please visit for example the
  64     a(href="https://en.wikipedia.org/wiki/Algebraic_notation_(chess)")
  65         | Wikipedia page
  66     | for full information on this subject.
  67
  68 h4 Rooks
  69
  70 p.
  71     They move either horizontally or vertically, as far as they want while the path
  72     is free of pieces. If this path ends with an enemy piece, it can a priori be captured
  73     (a priori because if the move ends up with the king in check, then it's illegal).
  74
  75 h4 Knights
  76
  77 p.
  78     They are the only units able to jump over other pieces (without capturing them).
  79     They do "L" moves: two squares in one direction (horizontally or vertically),
  80     and then one square in an orthogonal direction.
  81
  82 figure.diagram-container
  83     .diagram
  84         | fen:k7/2p5/5q2/2b5/4N3/2R3r1/3P4/7K f6,d6,c5,f2,g3,g5:
  85     figcaption Possible knight moves from e4.
  86
  87 h4 Bishops
  88
  89 p.
  90     They move diagonally, as far as they want while the path is free of pieces.
  91     If this path ends with an enemy piece, it can a priori be captured.
  92
  93 h4 Queen
  94
  95 p This piece combines the movement of a rook and a bishop, with the same conditions.
  96
  97 h4 King
  98
  99 p.
 100     This piece moves like a queen, but only by one square at a time. The final square
 101     must be either vacant or occupied by an enemy piece (therefore captured).
 102
 103 p.
 104     The king cannot be captured, but a move may ends up attacking enemy's king.
 105     It is said to be "under check" (or "in check") and the opponent must either:
 106 ul
 107     li move the king to a safe square, or
 108     li capture the attacker, or
 109     li intercept the attacking line.
 110 p Depending on the situation one or more of these counter-measures could be impossible.
 111
 112 p Leaving our king in check after a move is forbidden.
 113
 114 figure.diagram-container
 115     .diagram
 116         | fen:r6k/4q3/8/8/8/B7/8/K7:
 117     figcaption Bxe7 is illegal (it allows Rxa1).
 118
 119 h3 Special moves
 120
 121 p Apart from pawn promotion which has already been introduced, two special moves exist:
 122 ul
 123     li.
 124         castle: if both the king and the right-most (from white player perspective) rook
 125         haven't moved yet, and if nothing stand in the path from king to rook, and if the
 126         squares f1 and g1 are either free or occupied by the king or rook implied, then
 127         the king can go to g1 while the rook moves to f1. Note that since positions are
 128         shuffled one of these two pieces may apparently not move.
 129         The same can be done on the other side (left-most rook), and end squares are c1
 130         for king and d1 for rook. The former is small castle, and the latter large castle.
 131         Notation: small castle writes "0-0" while large castle is "0-0-0".
 132     li.
 133         en-passant: after a pawn has jumped two squares, if an enemy pawn stands just next
 134         to it then it can capture the jumping pawn "en passant", exactly as if it had
 135         advanced only one square. The move is noted as usual, but with "e.p." in the end
 136         to indicate the special move.
 137         The capture is possible only right after the pawn jump: not later in the game.
 138
 139 figure.diagram-container
 140     .diagram.diag12
 141         | fen:nr1kb1r1/ppp3pp/8/2Pp4/8/7P/PP3PP1/1R3KBR:
 142     .diagram.diag22
 143         | fen:nr1kb1r1/ppp3pp/3P4/8/8/7P/PP3PP1/2KR2BR:
 144     figcaption.
 145         Left: black just played d5 (jump from d7).
 146         Right: after cxd6 e.p. and 0-0-0.
 147
 148 h3 End of the game
 149
 150 p.
 151     The best-known way to end a game is by "checkmating" the enemy king.
 152     This means that you end a move in a situation where the king can be captured,
 153     and your opponent has no way to avoid the capture.
 154     The checkmating player has one point and the other zero, so the score writes 1-0
 155     or 0-1 depending if white pieces or black pieces mated.
 156
 157 figure.diagram-container
 158     .diagram
 159         | fen:rnbqkbnr/ppp2Qpp/2np4/4p3/2B1P3/8/PPPP1PPP/RNB1K1NR:
 160     figcaption Famous mating pattern: 1-0
 161
 162 p All other ways to end the game lead to a draw (1/2-1/2); nobody wins:
 163 ul
 164     li when a player has no legal move but is not under check (stalemate),
 165     li.
 166         when a position is repeated three times with the same castling right and
 167         same player in turn,
 168     li when 50 moves are played without pawn movement or capture.
 169 p.
 170     Note: this last way to end a game is not implemented, because it quite seldom occurs,
 171     does not generalize so well to variants (it depends), and more important because
 172     games played on this website are not official tournament games. If you feel like
 173     manoeuvring for 200 moves and your opponent isn't bored, then why would I stop you? :)