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The Chess Variant Pages



This page is written by the game's inventor, H. G. Muller.

Cashew Shogi

Cashew Shogi is inspired by the historic Japanese Chess variant Dai Dai Shogi. The latter game contains many unique and interesting ideas (e.g. multiple captures, hook movers, promotion by capture). But it is huge (17x17 board, 96 pieces of 64 types, with 4 more types available through promotion), so that it is quite tedious to play. Cashew Shogi is Dai Dai Shogi shrunk by roughly a factor two, by selecting a subset of the pieces (54 pieces of 35 types, with 2 more available through promotion) on a 13x13 board. This is done to conserve the feel of the game as much as possible, by selecting the key pieces, and a representative set of the others, with a slight bias against the very weakest of each class.

Setup

Fourth and fifth rank
  • a4-m4, a10-m10 Pawns (fW)
  • d5, j5, d9, j9 Gun (fRbW)

Click on piece name to see how it moves

Avalable through promotion only

Pieces

Hook movers

The Hook Mover is a Rook that can (but doesn't have to) make one 90-degree turn in its trajectory. On an empty board it could reach any square, most of them in two ways. A Goblin is a Bishop that can do likewise. Which means it can reach any square of its color on an empty board. It furthermore can step one orthogonally to reach the other color.

Wolf

The Wolf is a triple mover: it can move make upto 3 King steps along a ray, and even return to its starting square (but not overshoot it). It can make these steps as jumps when it choses to do so. So it can:

All these moves can be made with a capture on the final square as well as to an empty square. So the Wolf can capture upto 3 pieces per turn. If any piece is captured, the Wolf you start with must promote, and it is very questionable whether the promoted form is stronger than the the Wolf.

Lion, Berserker

A Berserker moves as a Lion or slides upto 3 squares in any of the 8 directions. The Lion is a double mover: it can make upto 2 King steps per turn, changing direction between them, even when this returns it to its starting square. It can make the first step as jump, when it chooses to do so. So it can:

If any piece is captured, the Lion you start with must promote to Berserker. And as the Berserker is upward compatible with the Lion, that is a good thing.

Rules

Goal

The game is won by capturing the opponent's King.

Promotion

Many pieces besides Pawns can promote. There is no choice for what they promote to; each piece has a fixed promoted form, which can be different for each piece type. Promotion is irreversible, and once the piece is promoted it keeps the promoted form for the rest of the game, or until it is captured. Promotion can happen anywhere on the board, but only when the piece captures something, and is mandatory in that case (when the piece is promotable).

Repetition

Repeating a position that has occurred previously (with the same side to move) is in principle forbidden. But to prevent abuse of this rule for material gains and allowing draws in positions where really nothing can be achieved anymore, the outcome of the game is not automatically a loss for the side whose move created the repeated position, but will depend on all moves since the previous occurrence of the position as follows:

Notes

The initial setup has 10 piece types that come as a pair, and do not promote. (In the 3 cases where these are asymmetric these come as mirrored left and right versions.) Ten other piece types are promotable, and in those cases you start with both one of the promotable piece, and one of the piece it promotes to. The latter in general is not promotable, and thus could be considered as already promoted. Lion and Wolf are the only pieces that can be obtained through promotion, but occur in the initial setup not as the already promoted version of the Viking and Hun, but as promotable pieces (promoting to Berserker or Elephant).

Apart from being an interesting game in itself, Cashew Shogi can be used as a convenient first step towards learning the larger game, as the rules in no way contradict these of Dai Dai Shogi, but are a true sub-set of those.

I renamed a few pieces compared to Dai Dai Shogi, to prevent there were too many Dragons, Tigers, Elephants and such, and try to give them names that would be more easily to associate with available WinBoard piece graphics, and be slightly more mnemonic for their move. The Deep and Broad Guard were originally called 'White Tiger' and 'Blue Dragon'. The Unicorn was a Great Dragon, and what here are called Dragon and Tiger were originally 'Flying Dragon' and 'Savage Tiger'. The Butterfly was originally a 'Cat Sword', whatever that may mean. Castle and Crowned Bishop are used here for the 'Dragon King' and 'Dragon Horse' also known from regular Shogi. The Eastern and Western Barbarians became Viking and Hun. The Gun was originally a 'Howling Dog'.



This 'user submitted' page is a collaboration between the posting user and the Chess Variant Pages. Registered contributors to the Chess Variant Pages have the ability to post their own works, subject to review and editing by the Chess Variant Pages Editorial Staff.


By H. G. Muller.
Web page created: 2015-03-10. Web page last updated: 2015-03-10