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TAI.RUL
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1996-02-18
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" INTRODUCTION
==============
Tai Shogi (Grand Shogi) with its 25x25 square board and 354 pieces is
thought to be the largest chess game in the world. (While there is a
suggestion that there was once a form of Shogi called 'Tai-Kyoku' played
on a board of 36x36 squares, no rules have ever been found.) Tai Shogi is
a gargantuan of a game both in terms of strategy and playing time. A
serious game of Tai will require several long sessions to complete and may
need over 1000 moves per player. The game is simply too big to be played
strategically, and therefore the game typically proceeds as a series of
local skirmishes as both players try to develop their pieces and improve
their position.
The exact date Tai Shogi was invented is not known. The oldest surviving
record of the moves of the pieces is in Nishizawa Teijin's SHO SHOGI
ZUSHIKI, published in 1694.
While most of the 101 different pieces in Tai Shogi are also found in other
variants, one unique feature of Tai is the presence right from the
beginning of the game of the all powerful 'Emperors'.
THE GAME
=========
Tai Shogi is played on a board of 25 x 25 squares and each player has
177 pieces (including 25 pawns)!
As in all Shogi games, the pieces are flat and wedge-shaped and are not
distinguished by colour. Although the pieces are of uniform colour the
first player is still conventionally referred to as 'Black' and the second
player as 'White'. Ownership of the pieces is indicated by the direction
in which they face, with a player's pieces always pointing towards the
opponent.
The players make alternate moves, with the object being to capture the
opposing 'Emperor' AND the 'Crown Prince'. If a player has acquired a 2nd
'Crown Prince' (by promoting the 'Drunk Elephant') that piece must also be
captured before the game can be won.
On each turn a player can move one piece according to its power of
movement to a vacant square on the board, or to a square occupied by an
enemy piece (in which case the enemy piece is captured and removed from
the game).
In the case of the 'Lion' and pieces with 'Lion' power a second move can
sometimes be made in the same turn.
THE PIECES
===========
The Piece Help screen provides the names, notation symbols, promotion
details, and powers of movement for all of the pieces in the game.
[The Piece Help screen can be reached by clicking on the 'Pieces' button]
JUMPING PIECES
===============
The 'Kylin','Phoenix', 'Donkey', 'Poisonous Snake' and 'Knight' (and the
'Emperor' and those pieces with 'Lion' powers) have the power to jump over
occupied squares. As indicated by red circles on the Piece Help screens,
the 'Kylin' can jump to the second square in any orthogonal direction, the
'Phoenix' may jump to the 2nd square when moving diagonally, the 'Donkey'
can jump to the 2nd square directly forwards or backwards, and the
'Poisonous Snake' can jump either forwards or to the backward diagonals.
The pieces shown on the 'Piece Help Screen' as having moves of 2, 3 or 5
squares can only move more than one square in the directions indicated if
the intervening squares are unoccupied (ie: they can not jump).
THE LION
=========
The 'Lion' has an unusual and powerful move.
If the 8 squares immediately adjacent to the 'Lion' are called the 'A'
squares (shown as Dark Blue Circles on the Piece Help screen), and the 16
squares two away from the piece are called the 'B' squares (represented as
Light Blue Circles), then the 'Lion' may do anyone of the following things
in a single turn:
- Move directly to any 'A' or 'B' square, jumping an intervening square
if necessary;
- Capture a piece on an 'A' square and continue moving one more square
in any direction from the point of capture, making another capture if
the 2nd square is also occupied by an enemy piece.
- Capture a piece on any 'A' square without moving (this is known as
'igui' and counts as a turn).
- Move to an adjacent square and return to the starting square
(effectively passing the turn).
In Tai Shogi there are no restrictions on the capture of Lions (as there
are in Chu Shogi).
On promoting to 'Furious Fiend' the 'Lion' gains the power of the 'Lion
Dog' (ie: it can move up to 3 squares in any orthogonal or diagonal
direction). The 'Furious Fiend' can move as either a 'Lion' or 'Lion
Dog' on any one turn (it can not combine the two powers in the same move).
The 'Buddhist Spirit' (promoted 'Dark Spirit') has the combined powers of
the 'Lion' and 'Free King', and can move as either (but not both) on any
one turn. The 'Buddhist Spirit' is therefore a very mobile and dangerous
piece.
TEACHING KING
===============
In Nishizawa Teijin's SHO SHOGI ZUSHIKI, the 'Teaching King' (promoted
'Deva') is described as having the combined moves of the 'Lion Dog' (up to
3 squares in any orthogonal or diagonal direction) and the 'Free King'.
The moves of the 'Lion Dog' are completely subsumed by the powers of the
'Free King' anyway, so this piece only has one way of moving (ie: as a
'Free King').
HOOK MOVERS
============
The pieces with 'hook moving' capabilities are very powerful pieces.
The 'Hook Mover' itself has a Double Rook move, being able to move any
number of squares in any orthogonal direction, immediately followed by a
further move at right angles to the first. The two legs of the 'Hook Mover'
move do not have to be of the same length, and it is not compulsory that
it make the 2nd Rook move. To give some idea of the power of this move it
is worth noting that the 'Hook Mover' on an empty board would be able to
reach any square in one turn! The 'Hook Mover' is not a jumping piece,
and must end its move on making a capture.
The 'Capricorn' has hook moving powers in the diagonal directions (ie: it
is effectively a Double Bishop). The 'Long-Nosed Goblin' can either 'hook
move' in the diagonal directions or move one square orthogonally. The
other hook mover in Tai Shogi is the 'Peacock' which is a 'hook mover' in
the forward diagonal directions only, and can move one or two squares
along the backward diagonals.
THE CROWN PRINCE
==================
In Tai Shogi there is a 'Crown Prince' in the game at the start of play and
this piece must be captured (along with the 'Emperor') before the game is
won.
In addition, the 'Drunk Elephant' can also be promoted to a second 'Crown
Prince'. If this occurs both 'Crown Princes' (and 'Emperor') must be
taken before the game is ended.
THE EMPEROR
=============
A unique feature of Tai Shogi is the presence right from the start of the
game of the all powerful 'Emperors'. The 'Emperor' has the greatest power
of any piece in any of the Shogi variants as it may move in one turn to
almost a