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The first group is concerned with
different indicators of mobility. These advisors were inspired
in part by [\protect\citenameChurch and Church, 1979] and [\protect\citenameBotvinnik, 1970], and by
generalising features used for game-specific programs [\protect\citenamePell, 1993b].
dynamic-mobility:counts the number of squares to which a
piece can move directly from its current square on the current
board, using a moving power.
static-mobility:a static version of immediate-mobility, this
counts the number of squares to which a piece could move directly
from its current square on an otherwise empty board, using a
moving power.
capturing-mobility:counts the number of captures each piece
could make in the current position, regardless of the usefulness of
the capture. It does not even distinguish whether the victim is a
friendly or enemy piece. There is no static version of this
advisor. For future work, one way to approximate the potential
capturing ability of a piece might be to play random games and count
the pieces attacked by each piece in each position.
eventual-mobility:measures the total value of all squares to
which a piece could move eventually from its current square on an
otherwise empty board, using a moving power. The value of
each square decreases (by a parameter-controlled function) with the
number of moves required for the piece to get there. Thus while a
bishop has 32 eventual moves and a knight has 64 from any square,
the bishop can reach most of its squares more quickly, a fact
captured by this advisor.