Manual de Houdini 3 2012 | Page 274

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intervening pieces
.
3.3. The knight moves to one of the squares nearest to that on which it stands but
not on the same rank, file or diagonal. It does not pass directly over any intervening
square.
3.4. (a) The pawn moves forward to the unoccupied square immediately in front of it
on the same file, or
(b) on its first move the pawn may advance two squares along the same file provided
both squares are unoccupied, or
(c) the pawn moves to a square occupied by an opponent's piece which is diagonally
in front of it on an adjacent file, capturing that piece.
(d) A pawn attacking a square crossed by an opponent's pawn which has advanced
two squares in one move from its original square may capture this opponent's pawn as
though the latter had been moved only one square. This capture can be made only on
the move following this advance and is called an 'en passant' capture.
(e) When a pawn reaches the rank furthest from its starting position it must be
exchanged as part of the same move for a queen, rook, bishop or knight of the same
colour. The player's choice is not restricted to pieces that have been captured
previously. This exchange of a pawn for another piece is called 'promotion' and the
effect of the new piece is immediate.
3.5. (a)The king can move in two different ways, by:
(i) moving to any adjoining square that is not attacked by one or more of the
opponent's pieces,
or
(ii) 'castling'. This is a move of the king and either rook of the same colour on the
same rank, counting as a single move of the king and executed as follows: the king is
transferred from its original square two squares towards the rook, then that rook is
transferred over the king to the square the king has just crossed.
(1) Castling is illegal:
[a] if the king has already been moved, or
[b] with a rook that has already been moved
(2) Castling is prevented for the time being:
[a] if the square on which the king stands, or the square which it must cross, or the
square which it is to occupy, is attacked by one or more of the opponent's pieces.
[b] if there is any piece between the king and the rook with which castling is to be
effected.
(b) The king is said to be 'in check', if it is under attack by one or more of the
opponent's pieces, even if such pieces cannot themselves move.
Declaring a check is not obligatory.
A player must not make a move which places or leaves his own king in check.

4.5

4: The act of moving the pieces
4.1. Each move must be made with one hand only.
4.2. Provided that he first expresses his intention (e.g. by saying "j'adoube"), the
player having the move may adjust one or more pieces on their squares.
4.3. Except as provided in Article 4.2, if the player having the move deliberately
touches on the chessboard
(a) one or more pieces of the same colour, he must move or capture the first piece

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