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Shogi, Japanese variant chess

Shogi(将棋, shōgi?), or Japanese chess, is the most popular of a family of chess variants native to Japan.

Rules Of The Game

Objective

Technically the game is won when a king is captured, though in practice defeat is conceded at mate or when mate becomes inevitable.

Game Equipment

A traditional shōgi-ban (shogi board) displaying a set of koma (pieces). The pieces on the far side are turned to show their promoted values.

Two players, Black and White (or sente 先手 and gote 後手), play on a board composed of squares (actually rectangles) in a grid of 9 ranks (rows) by 9 files (columns). The squares are undifferentiated by marking or colour.
Each player has a set of 20 wedge-shaped pieces of slightly different sizes. Except for the kings, opposing pieces are differentiated only by orientation, not by marking or colour. From largest to smallest (most to least powerful), the pieces are:
  • 1 king
  • 1 rook
  • 1 bishop
  • 2 gold generals
  • 2 silver generals
  • 2 knights
  • 2 lances
  • 9 pawns
Several of these names were chosen to correspond to their rough equivalents in international chess and not as literal translations of the Japanese names.
Each piece has its name written on its surface in the form of two Japanese characters(kanji), usually in black ink. On the reverse side of each piece, other than the king and gold general, are one or two other characters, in amateur sets often in a different colour (usually red); this side is turned face up during play to indicate that the piece has been promoted. The pieces of the two players do not differ in colour, but instead each faces forward, toward the opposing side. This shows who controls the piece during play.
The Japanese characters have deterred many people from learning shogi. This has led to "Westernized" or "international" pieces, which replace the characters with iconic symbols. However, partially because the traditional pieces are already iconic by size, with more powerful pieces being larger, most Western players soon learn to recognize them, and Westernized pieces have never become popular.
Following is a table of the pieces with their Japanese representations and English equivalents. The abbreviations are used for game notation and often to refer to the pieces in speech in Japanese.
English name Image Kanji Romaji Meaning Abbreviations
King
(reigning)

Reigning king
王将
ōshō
royal general
K

ō
King
(challenging)

Challenging king
玉将
gyokushō
jade general
K

gyoku
Rook
Rook
飛車
hisha
flying chariot
R

hi
Promoted rook
("Dragon")

Promoted rook
龍王
ryūō
dragon king
+R
龍 or 竜*
ryū
Bishop
Bishop
角行
kakugyō
angle mover
B

kaku
Promoted bishop
("Horse")

Promoted bishop
龍馬
ryūma or ryūme
dragon horse
+B

uma
Gold general
("Gold")

Gold general
金将
kinshō
gold general
G

kin
Silver general
("Silver")

Silver general
銀将
ginshō
silver general
S

gin
Promoted silver
Promoted silver
成銀
narigin
promoted silver
+S
(全)

Knight
Knight
桂馬
keima
laureled horse
N

kei
Promoted knight
Promoted knight
成桂
narikei
promoted laurel
+N
(圭 or 今)

Lance
Lance
香車
kyōsha
incense chariot
L

kyō
Promoted lance
Promoted lance
成香
narikyō
promoted incense
+L
(杏 or 仝)

Pawn
Pawn
歩兵
fuhyō
foot soldier
p

fu
Promoted pawn
("tokin")

Promoted pawn
と金
tokin
reaches gold
+p
と (or 个)
to

* The kanji 竜 is a simplified form of 龍.

Closeup of shogi pieces. Top: +R, R, K (white), K (black), B, +B. Bottom: +L, L, +S, S, G, N, +N, p, +p.
English speakers sometimes refer to promoted bishops as horses and promoted rooks as dragons, after their Japanese names, and generally use the Japanese term tokin for promoted pawns. Silver generals and gold generals are commonly referred to simply as silvers and golds.
The characters inscribed on the reverse sides of the pieces to indicate promoted rank may be in red ink, and are usually cursive. The characters on the backs of the pieces that promote to gold generals are cursive variants of 金 'gold', becoming more cursive (more abbreviated) as the value of the original piece decreases. These cursive forms have these equivalents in print: 全 for promoted silver, 今 for promoted knight, 仝 for promoted lance, and 个 for promoted pawn (tokin). Another typographic convention has abbreviated versions of the unpromoted ranks, with a reduced number of strokes: 圭 for a promoted knight (桂), 杏 for a promoted lance (香), and the 全 as above for a promoted silver, but と for tokin.

Player Game

Players are ranked from 15 kyū to 1 kyū and then from 1 dan and upwards; this is the same terminology as in karate, go, calligraphy and many other arts in Japan. Professional players operate with their own scale, from professional 4 dan and upwards to 9 dan for elite players. Amateur and professional ranks are offset, corresponding as here.

Setup

The starting setup of a game of shogi, from the perspective of Black.
Each player places his pieces in the positions shown below, facing the opponent.
  • In the rank nearest the player:
    • The king is placed in the center file.
    • The two gold generals are placed in the adjacent files to the king.
    • The two silver generals are placed adjacent to each gold general.
    • The two knights are placed adjacent to each silver general.
    • The two lances are placed in the corners, adjacent to each knight.
That is, the first rank is |L|N|S|G|K|G|S|N|L|.
  • In the second rank, each player places:
    • The bishop in the same file as the left knight.
    • The rook in the same file as the right knight.
  • In the third rank, the nine pawns are placed one to each file.
Traditionally, even the order of placing the pieces on the board is determined. There are two recognized orders, ohashi and ito. The Japanese-language page Shogi Pineapple indicates the two orders; ohashi is depicted on the left and ito on the right.

Game Play

The players alternate taking turns, with Black playing first. (The terms "Black" and "White" are used to differentiate the two sides, but there is no actual difference in the color of the pieces.) For each turn a player may either move a piece which is already on the board and potentially promote it, capture an opposing piece, or both; or to "drop" a piece that has already been captured onto an empty square of the board. These options are detailed below.
Professional games are timed as in International Chess, but professionals are never expected to keep time in their games. Instead a timekeeper is assigned, typically an apprentice professional. Time limits are much longer than in International Chess (9 hours a side plus extra time in the prestigious Meijin title match), and in addition byōyomi (literally "second counting") is employed. This means that when the ordinary time has run out, the player will from that point on have a certain amount of time to complete every move (a byōyomi period), typically upwards of one minute. The final ten seconds are counted down, and if the time expires the player to move loses the game immediately. Amateurs often play with electronic clocks that beep out the final ten seconds of a byōyomi period, with a prolonged beep for the last five.

Movement And Capture

If an opposing piece occupies a legal destination for a friendly piece (that is, a piece belonging to the player whose turn it is to move), it may be captured by removing it from the board and replacing it with the friendly piece. It is not possible to move to or through a square occupied by another friendly piece, or to move through a square occupied by an opposing piece. It is common to keep captured pieces on a wooden stand (or komadai) which is traditionally placed so that its bottom left corner aligns with the bottom right corner of the board from the perspective of each player. It is not permissible to hide pieces from full view. This is because captured pieces, which are said to be in hand, have a crucial impact on the course of the game.
The knight jumps, that is, it passes over any intervening piece, whether friend or foe, without an effect on either. It is the only piece to do this.
The lance, bishop, and rook are ranging pieces: They can potentially move any number of squares along a straight line limited by the edge of the board. If an opposing piece intervenes, it may be captured by removing it from the board and replacing it with the moving piece. If a friendly piece intervenes, one is limited to a distance that stops short of that square; if the friendly piece is adjacent, one may not move in that direction at all.
All pieces but the knight move either orthogonally (that is, forward, backward, or to the side, in the direction of one of the arms of a plus sign, +), or diagonally (in the direction of one of the arms of a multiplication sign, ×).