Micro shogi

Microshogi

Microshogi (五分摩訶将棋 gofun maka shōgi "5-minute (scarlet) poppy chess") is a modern variant of shogi (Japanese chess), with very different rules for promotion, and demotion. Kerry Handscomb of NOST^{[note 1]} gave it this English name. Although not confirmed, he credits its invention to the late Oyama Yasuharu, a top level shogi player. The game was invented before 1982.

Equipment

Two players play on a board ruled into a grid of 5 ranks (rows) by 4 files (columns). The squares are undifferentiated by marking or color.

Each player has a set of 5 wedge-shaped pieces. The pieces are of slightly different sizes. From largest to smallest (or most to least powerful) they are:

• 1 king
• 1 bishop
• 1 gold general
• 1 silver general
• 1 pawn

Game rules

The game is identical to standard shogi with the following exceptions.

Setup

4 3 2 1   王 将 角 行 金 将 銀 将 一 歩 兵       二           三       歩 兵 四 銀 将 金 将 角 行 玉 将 五

4 3 2 1   K B G S a P       b         c       P d S G B K e

Each side places his pieces in the following positions, pointing toward the opponent. For more information see the ChessVariants.com page on micro shogi.

• In the rank nearest the player:
  • The king is placed in the right corner
  • The bishop is placed in the adjacent file to the king.
  • The gold general is placed adjacent to the bishop.
  • The silver general is placed adjacent to the gold general in the left corner.

That is, the first rank is |S|G|B|K|.

• In the second rank, each player places the pawn in the same file as the king.

Promotion

Unlike standard shogi, microshogi has no promotion zone. Instead, a piece promotes when it captures, and promotion is mandatory. When a promoted piece captures, it demotes—that is, it is flipped back over to show its original unpromoted value.

Promotion values are entirely different from standard shogi:

• A king does not promote: K
• A silver general becomes a lance and vice versa: S ↔ L
• A bishop becomes a tokin (T) and vice versa: B ↔ T
• A gold general becomes a rook and vice versa: G ↔ R
• A pawn becomes a knight and vice versa: P ↔ N

Thus when a lance, tokin, rook, or knight makes a capture, it reverts to its former state.

A knight which reaches one of the two far ranks is trapped, as is a pawn which captures and thus promotes there. Likewise, a pawn that reaches the far rank is trapped, as is a knight which captures there. A lance is also trapped at the far rank, but can escape if it captures there and thus demotes to a silver. A silver which captures in the far rank and therefore promotes to a lance is trapped.

Any trapped piece may be captured and returned to play as part of the opposing army.

A tokin moves the same way as a golden general.

Drops

Drops are similar to standard shogi, except that:

• A player may drop a piece with either side facing up.
• There are no restrictions when dropping pawns. That is, a player may have two unpromoted pawns on the same file, a piece can be dropped with no legal moves later, and a pawn can be dropped to give immediate checkmate.

See also

• Shogi variant
• Tori shogi
• Minishogi
• Judkins shogi
• Kyoto shogi
• Cannon shogi
• Yari shogi

Notes

1. NOST (kNights Of the Square Table), a (now defunct) correspondence game club formed in 1960 by Bob Lauzon and Jim France, enjoyed several hundred active members.

External links

• Shogi Net
• Shogi: Japanese Chess
• Chessvariants.com