Nana shogi is the smallest shogi variant. That is the smallest board game with pieces and rules based on those of the japanese game shogi. Some knowledge of the rules of normal shogi is assumed in the reader.
Nana shogi is played on a board marked into nine squares in three rows of three.
Each player has three cube shaped pieces, one conventional king (oushou) and two pieces with four values each.
One piece has the values: rook (hisha), chariot (hensha), swallow's wing (enu), go-between (chuunin).
The other piece has the values: bishop (kakugyou), tile general (gashou), cat's sword (myoujin), dog (inu).
These values are taken from shogi (hisha, kakugyou) chuushogi (chuunin, hensha) daishogi (myoujin) makadaidaishogi (gashou) washogi (enu) and tenjikushogi (inu).***HELP for Notations of pieces
START of GAME:
At the commencement of the game the board is empty, play begins with each player in turn dropping their king.
RULES to MOVE:
Players may then choose at their turn either to drop a piece or to move a piece on the board.
The other pieces may be dropped in whichever value state the player chooses.
When a piece other than a king moves on the board, either with or without capturing, that piece's value changes. Values change sequentially; rook to chariot to swallow's wing to go-between to rook, etc
and bishop to tile general to cat's sword to dog to bishop, etc.***HELP for promotions of pieces
It is illegal to drop any piece on the central square.
It is illegal to check or to checkmate by dropping a piece.
It is illegal to checkmate when one has one or more pieces in hand.
Player can give checkmate also by capturing move, if his hand was empty before his move.
In western chess the stalemate is draw, but in shogi it is not, because in shogi the way of thinking is, that to move a King sacrifice square is not illegal move.
Because the board of nana is so small, it's typical that player's pieces can easy land in difficult situation were they can't move reasonably and stalemate is
ready, even there are pieces in hand.