Tenjiku shogi


Tenjiku shogi is a large-board variant of shogi. The game dates back to the 15th or 16th century and was based on the earlier chu shogi, which itself was based on dai shogi.
Because of the terse and often incomplete wording of the historical sources for the large shogi variants, except for chu shogi and to a lesser extent dai shogi, the historical rules of tenjiku shogi are not clear. Different sources often differ significantly in the moves attributed to the pieces. The descriptions listed here are a likely reconstruction based on chu shogi, the primary basis of tenjiku shogi, but not all contemporary players follow these historically-based rules. It is not clear if the game was ever played much historically, as there is no record of sets ever having been made.

Rules of the game

Objective

The objective of the game is to capture the opponent's king and, if present, the prince, which counts as a second king. Unlike standard shogi, captured pieces may not be dropped back into play by the capturing player.

Game equipment

Two players, Black and White, play on a board composed of squares in a grid of 16 ranks by 16 files with a total of 256 squares. The squares are undifferentiated by marking or color. A pair of dots may be placed just beyond the fifth rank on each side to mark the promotion zones and aid in the initial setup of the two camps.
Each player has a set of 78 wedge-shaped pieces of 36 types. In all, the players must remember 43 moves for these pieces. The pieces are of slightly different sizes. From largest to smallest they are:
  • 1 King
  • 1 Great general
  • 1 Vice general
  • 2 Rook generals
  • 2 Bishop generals
  • 1 Free eagle
  • 1 Queen
  • 2 Soaring eagles
  • 2 Horned falcons
  • 2 Water buffalos
  • 4 Chariot soldiers
  • 2 Fire demons
  • 1 Lion hawk
  • 1 Lion
  • 2 Dragon kings
  • 2 Dragon horses
  • 2 Rooks
  • 2 Bishops
  • 1 Kirin
  • 1 Phoenix
  • 1 Drunken elephant
  • 2 Blind tigers
  • 2 Ferocious leopards
  • 2 Gold generals
  • 2 Silver generals
  • 2 Copper generals
  • 2 Vertical movers
  • 2 Side movers
  • 2 Reverse chariots
  • 2 Vertical soldiers
  • 2 Side soldiers
  • 2 Lances
  • 2 Knights
  • 2 Iron generals
  • 2 Dogs
  • 16 Pawns
Several of the English names were chosen to correspond to rough equivalents in Western chess, rather than as translations of the Japanese names. The queen is sometimes referred to as the free king, a direct translation of its Japanese name. The kirin's name is sometimes anglicised as kylin''.
Each piece has its name in the form of one or two kanji written on its face. On the reverse side of some pieces are two or three other characters, often in a different color such as red; this reverse side is turned up to indicate that the piece has been promoted during play. The pieces of the two sides do not differ in color, but instead each piece is shaped like a wedge, and faces forward, toward the opposing side. This shows who controls the piece during play.

Table of pieces

Listed below are the pieces of the game and, if they promote, which pieces they promote to. Pieces marked with an *asterisk are only available with promotion.
The promotions can be summarized as series of promotion chains, as follows. Within each block below, a piece promotes to the piece above it. Pieces at the top of each block do not promote. Note that pieces may only promote once. For example, a gold general promotes to a rook, and a rook promotes to a dragon king, but a gold general promoted to a rook cannot promote a second time to a dragon king. This is clear from the equipment, for each piece only has two sides.
The pieces with a pink background do not appear in chu shogi. Of the chu shogi pieces, only the go-between does not appear in tenjiku shogi, being replaced by the dog in its function of being a piece in front of the pawn line. The knight and iron general appear in dai shogi, but there they promote to gold general.

Setup

The initial setup of the board is as follows. See below for a description of the types of moves involved.
;Full names
;Abbreviated names



Game play

Two players alternate making a move, with Black moving first. A move consists of moving a piece either to an empty square on the board or to a square occupied by an opposing piece, thus capturing that piece; and optionally of promoting the moving piece, if the move enters the promotion zone, or if it is a capture and any part of it is in the promotion zone. Each of these options is detailed below.
Despite the large size of the board and number of pieces, tenjiku shogi games are often quicker than smaller shogi variants because of the higher average power of the pieces. Good use of the fire demons can make for a short game.

Movement and capture

Tenjiku shogi pieces that occur in chu shogi or dai shogi move as they do in that game, but the pieces from dai shogi promote differently.
An opposing piece is captured by displacement: That is, if a piece moves to a square occupied by an opposing piece, the opposing piece is displaced and removed from the board. A piece cannot move to a square occupied by a friendly piece, that is, by another piece controlled by the moving player. The one exception to this is the unique burn of the fire demon.
Each piece on the game moves in a characteristic pattern. Pieces move either orthogonally, or diagonally. The vice general, fire demon, lion hawk, lion, and knight are exceptions, in that they do not move, or are not required to move, in a straight line.
Many pieces are capable of several kinds of movement, with the type of movement most often depending on the direction. The movement categories are:

Step movers and limited range movers

Some pieces are limited to moving one square at a time. If a friendly piece occupies an adjacent square, the moving piece may not move in that direction; if an opposing piece is there, it may be displaced and captured.
The step movers are the king, drunk elephant, blind tiger, ferocious leopard, gold general, silver general, copper general, iron general, dog, and pawn. Other pieces may step in certain directions, but move differently in other directions.
Other pieces have a limited range of two squares along a straight line. The water buffalo, chariot soldier, vertical soldier, and side soldier may move one or two squares in certain directions. They can only move to the second square if the first is unoccupied. They may capture on either square, but must stop where they capture.

Area movers

The lion, lion hawk, vice general, and fire demon may take multiple steps in a single turn. These do not have to be in a line, so these pieces can potentially reach every square within two or three steps of the starting square, not just squares along one of the diagonals or orthogonals. Such moves are also useful to get around obstructions. An area mover must stop where it captures.

Jumping pieces

Some pieces can jump, or in the case of the knight can only jump: They pass over an intervening piece, whether friend or foe, with no effect on either. These are the free eagle, lion hawk, lion, soaring eagle, horned falcon, tetrarch, kirin, phoenix, and knight. These jumps all have a range of two squares: that is, the first square is passed over, and the piece lands on the second. The knight jumps between the diagonals and orthogonals, and the lion and lion hawk may do so.

Ranging pieces

Many pieces can move any number of empty squares along a straight orthogonal or diagonal line, limited only by the edge of the board. If an opposing piece intervenes, it may be captured by moving to that square and removing it from the board. A ranging piece must stop where it captures, and cannot bypass a piece that is in its way. If a friendly piece intervenes, the moving piece is limited to a distance that stops short of the intervening piece; if the friendly piece is adjacent, it cannot move in that direction at all.
The ranging pieces are the great general, vice general, rook general, bishop general, free eagle, soaring eagle, horned falcon, queen, water buffalo, chariot soldier, fire demon, lion hawk, dragon king, dragon horse, rook, bishop, vertical mover, side mover, reverse chariot, vertical soldier, side soldier and lance.

Range jumping pieces

A few powerful pieces may jump over any number of pieces, friend or foe, along a diagonal or orthogonal, but only when making a capture. These are the great general, vice general, rook general, and bishop general.
However, they may only jump over other pieces of lower rank, whether friend or foe. None may jump a king or prince of either side. The relevant ranking is:
  1. King, prince
  2. Great general
  3. Vice general
  4. Rook general, bishop general
That is, bishop and rook generals cannot jump over any other range-jumping piece.
The range jumpers can nevertheless capture each other, even if they cannot jump over each other and there are other pieces outside the ranking in the way. This extends to the king and prince, which can be captured with or without jumping.
Some descriptions of the game do not limit this ability to moves making a capture. However, most mention that these pieces have two types of move, ranging and range jumping, suggesting that the capture rule may have been mistakenly omitted.

Multiple captures

The lion, lion hawk, free eagle, soaring eagle and horned falcon have sequential multiple-capture abilities, called "lion moves". The fire demon can "burn" multiple pieces simultaneously. These unusual moves are described below.

Other

The heavenly tetrarch cannot move to an adjacent square, and has other idiosyncrasies; the fire demon 'burns' adjacent pieces. This is best described below.

Repeated board positions

A player is not allowed to make a move that would return the board to a previous position, with the same player to move. This rule prevents games from entering into a repeated loop.
However, evidence from chu shogi problems suggests that this at least does not apply to a player who is in check or whose pieces are attacked, as otherwise one could win via perpetual check or perpetual pursuit. The modern chu shogi rule as applied by the Japanese Chu Shogi Association is as follows, and presumably tenjiku shogi should be similar. If one side is making attacks on other pieces with his moves in the repeat cycle, and the other is not, the attacking side must deviate, while in case of checking the checker must deviate regardless of whether the checked side attacks other pieces. In the case of consecutive passes, the side passing first must deviate, making turn passing to avoid zugzwang pointless if the opponent is in a position where he can pass his turn too. If none of these are applicable, repetition is a draw.

Promotion

Tenjiku shogi pieces that occur in chu shogi promote as they do in that game, with the exceptions of the lion and queen, which do not promote in chu shogi.
A player's promotion zone consists of the five far ranks, at the original line of the opponent's pawns and beyond. When a promotable piece makes a move entering the promotion zone, or makes a capture within the promotion zone—including captures entering, leaving, or entirely within the zone—it has the option of "promoting" to a more powerful rank.
The historical sources do not provide guidance on whether pieces which take multiple steps per move are allowed to promote by crossing into the promotion zone and back out again. Chu shogi does not offer guidance here either, because such pieces do not promote in chu shogi. The Chess Variant Pages adopt the stipulation that a move allows promotion if and only if:
  • It starts outside and ends inside the promotion zone, or:
  • It is a capture and starts inside the promotion zone.
By this rule, igui or capturing does not allow promotion if the move begins and ends outside the promotion zone, even if it passes in and back out along the way.
Promotion is effected by turning the piece over after it moves, revealing the name of its promoted rank. As such, a promoted piece cannot then promote a second time. Promotion is never mandatory, and in some cases it may be beneficial to leave the piece unpromoted. Promotion is permanent and promoted pieces may not revert to their original rank.
Promoting a piece has the effect of changing how that piece moves. See above for what each piece promotes to and below for how they move.
The king, great general, vice general, free eagle, lion hawk, and fire demon do not promote, nor can already promoted pieces promote further.
If a piece is not promoted upon entering the promotion zone, then it may only promote if it makes a capture. This is reset by leaving the zone and reentering: promotion is possible on such a reentry even without a capture.
If a piece which cannot retreat or move to the side advances to the far rank, so that it would otherwise have no further legal move, it is trapped. These pieces are the pawn, knight, iron general, and lance. In practice this would never occur for pawns or lances, which promote to pieces which keep their old moves, so that there is never any reason to defer their promotion, as stalemate is a loss for the stalemated player, and there are no other rules that might require this to happen, such as the lion-protection rules of chu shogi.
The situation for the knight and iron general, which promote to pieces that do not keep their old moves, is unclear. Since there could be a reason to defer their promotion, it is possible that they receive a second chance to promote at the far rank on a non-capture, as in chu shogi. This second chance, if it exists, could likewise be declined, leaving the knight or iron general as an immobile "dead piece". However, this is uncertain, because it is not clear when the rule of pawn promotion was added to chu shogi, and because the Edo-era sources have numerous lacunae in the rules for the variants other than sho shogi and chu shogi.

Movement diagrams

In the diagrams below, the different types of moves are coded by symbol and by color: blue for step moves, green for multiple capture, red for range moves, yellow for jumps, and orange for ranging jumps.

Individual pieces

Pieces are arranged in this section so that, if they promote, they promote into the piece above them. Piece names with a grey background are present at the start of the game; those with a blue background only appear with promotion. Betza's funny notation has been included in brackets for easier reference, with the extension that the notation xxxayyyK stands for an xxxK move possibly followed by an yyyK move, not necessarily in the same direction. Larger numbers of 'legs' can be indicated by repeated application of 'a', or by numbers: thus a3K means a piece that can take up to three steps of a king. By default continuation legs can go into all directions, but can be restricted to a single line by a modifier 'v'. The default modality of all legs is the ability to move and capture: other possibilities are specified explicitly. Thus mKa3K means a piece that takes up to three steps of a king, but must stop when it first captures. Square brackets are used to make it clear what legs the a' modifier chains together: thus DaK would denote a dabbaba move followed by a king move, but D would denote a piece that can move as a dabbaba, or twice as a king.
Another extension is that inequalities can be used in place of numbers denoting range: thus, while R4 is a piece that moves like a rook, but only up to four squares, R is a piece that moves like a rook, but only two, three, or four squares. Further, pn refers to cannon-like pieces that can jump at most n'' pieces along their path, and pp means the same as p∞. Finally, x' stands for "shooting": the xK for instance can pass its turn, or it can shoot any adjacent enemy piece without moving.

Jeweled general 玉将 gyokushōPrince 太子 taishi''-----


Repetition

A player may not make a move if the resulting position is one that has previously occurred in the game with the same player to move. This is called repetition. Note that certain pieces have the ability to pass in certain situations. Such a pass move leaves the position unchanged, but it does not violate the repetition rule, as it will now be the turn of the other player to move. Of course, two consecutive passes are not possible, as the first player will see the same position as before.
However, evidence from chu shogi problems suggests that this at least does not apply to a player who is in check or whose pieces are attacked, as otherwise one could win via perpetual check or perpetual pursuit. The modern chu shogi rule as applied by the Japanese Chu Shogi Association is as follows, and presumably tenjiku shogi should be similar. If one side is making attacks on other pieces with his moves in the repeat cycle, and the other is not, the attacking side must deviate, while in case of checking the checker must deviate regardless of whether the checked side attacks other pieces. In the case of consecutive passes, the side passing first must deviate, making turn passing to avoid zugzwang pointless if the opponent is in a position where he can pass his turn too. Only the fourth repetition is forbidden by these rules. If none of these are applicable, repetition is a draw.

Check and mate

When a player makes a move, such that the opponent's only remaining king or prince could be captured on the following move, the move is said to give check; the king or prince is said to be in check. If a player's last king or prince is in check and no legal move by that player will get it out of check, the checking move is also mate, and effectively wins the game.
Unlike Western chess, a player need not move out of check in tenjiku shogi, and indeed may even move into check. Although obviously not often a good idea, a player with more than one royal may occasionally sacrifice one of these pieces as part of a gambit.

Game end

A player who captures the opponent's sole remaining king or prince wins the game. Thus a player who is checkmated or stalemated will lose. The very artificial situation of a smothered stalemate, where no moves are possible, is not covered in the historical sources. On their pages for chu shogi and dai shogi, The Chess Variant Pages rule this as a loss for the stalemated player, for definiteness.
In practice these winning conditions are rarely fulfilled, as a player will typically resign when checkmated, as otherwise when loss is inevitable.
A player who makes an illegal move loses immediately.
The historical rules do not address the situation where both sides' kings perish in one move, because one king captures the other, which was standing next to a friendly fire demon. But in practice this would never occur.

Handicaps

Games between players of disparate strength may be played with handicaps, but there is no known historical handicap system for tenjiku shogi. Games such as chess and chu shogi can serve as models for a handicap system, where a player can surrender one or more pieces, or trade them for other pieces and/or the first move.

Game notation

The method used in English-language texts to express shogi moves was established by George Hodges in 1976. It is derived from the algebraic notation used for chess, but modifications have been made for tenjiku shogi.
A typical example is P-8g.
The first letter represents the piece moved.
Promoted pieces have a + added in front of the letter. e.g., +P for a promoted pawn. The designation of the piece is followed by a symbol indicating the type of move: - for an ordinary move or x for a capture. Next is the designation for the square on which the piece lands. This consists of a number representing the file and a lowercase letter representing the rank, with 1a being the top right corner and 16p being the bottom left corner.
If a lion, horned falcon, soaring eagle or Heavenly Tetrarch captures by igui, or the fire demon burns, the square of the piece being captured is used instead of the destination square, and this is preceded by the symbol !. A piece moving next to a fire demon is followed by a *. If a double or triple capture is made, than subsequent captures are added after the first capture.
If a move entitles the player to promote the piece, then a + is added to the end to signify that the promotion was taken, or an = to indicate that it was declined.
For example, Nx7d= indicates a knight capturing on 7d without promoting.
In cases where the above notation would be ambiguous, the designation of the start square is added after the designation for the piece in order to make clear which piece is meant.
Moves are commonly numbered as in chess.
In handicap games White plays first, so Black's move 1 is replaced by an ellipsis.

Strategy

Piece values

According to the German Chu Shogi Association, the average values of the pieces are :
Piece nameApproximate
value		PromotionApproximate
value
Fire Demon83—
Great General45—
Vice General39—
Water Buffalo17Fire Demon83
Rook General23Great General45
Lion Hawk25—
Bishop General21Vice General39
Free Eagle22—
Queen22Free Eagle22
Lion18Lion Hawk25
Soaring Eagle18Rook General23
Horned Falcon19Bishop General21
Chariot Soldier18Heavenly Tetrarch12
Dragon King14Soaring Eagle18
Dragon Horse12Horned Falcon19
Rook12Dragon King14
Vertical Soldier8Chariot Soldier18
Side Soldier7Water Buffalo17
Bishop10Dragon Horse12
Vertical Mover7Flying Ox16
Side Mover7Free Boar16
Phoenix3Queen22
Kirin3Lion18
Lance6White Horse14
Reverse Chariot6Whale10
King4—
Drunk Elephant3Prince
Gold General3Rook12
Ferocious Leopard3Bishop10
Blind Tiger3Flying Stag
Silver General2Vertical Mover
Copper General2Side Mover
Iron General2Vertical Soldier
Knight1Side Soldier
Dog1Multi General
Pawn1Gold General

These average values do not take into account the special status of the king and prince as royal pieces. They have also been normalized so that the pawn is worth 1 point to avoid fractions. Additionally, pieces gain in value if they have a good chance of promotion, and the jumping generals and fire demon tend to lose some power as the board empties.