Universal Shogi Interface


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USI - Universal Shogi Interface

GUI to Engine		Engine to GUI
usi	Tell GUI to use the USI game interface. This must be the first command after program boot. e.g. usinewgame	id	After receiving the "usi" command engine must sent id name [Enine name] id author [Author]
		usiok	Must be sent after the id and optional options to tell the GUI that the engine is ready to play.
usinewgame	Sent to the engine when the next search will be from a different game.		Engine should start new game.
ready	To synchronize the engine with the GUI This command can be used to wait for the engine to be ready.	readyok	This must be sent when the engine has received an "isready" command and has processed all input and is ready to accept new commands now.
position [sfen \| startpos] moves	Set up the position for search. Options: startpos - engine should start the game sfen - describe board using Forsyth–Edwards Notation. This options available only for games on rectangle board.		Engine set up position
go depth [depth] movetime [movetime]	Tell engine start calculate next move	bestmove	The engine send the best move to GUI
quit	Tell engine to shutdown		Quit the program as soon as possible

SFEN

Each type of piece is represented by one letter alphabet, the first piece is upper case letters, and the second piece is lower case letters:

Pawn P,p

Knight N,n

Lance L,l

Bishop B,b

Rook R,r

Gold G,g

Silver S,s

King K,k
To mark the state of promotion, add a + in front of the character of the piece.
For a blank cell use the number of whitespace followed
A Shogi FEN string (SFEN from now on) consists of a single line of ASCII text containing four data fields, separated by whitespace. These are:
1. Board State
The Placement Of The Pieces Of The Board Is Written Rank By Rank, With Each Rank Separated By A Slash ( '/')
2. The side to move
After coding the board write indicator of next turn - b (black) or w - (white).
Pieces In Hand
We Use Uppercase Letters For Black Pieces, And Lowercase Letters For White'S Captured Pieces. If neither player has any pieces in hand, a single minus character ("-") is used for the pieces in hand field.
Move count
An integer representing the number of the current move in the game.

Example

Initial position - lnsgkgsnl / 1 r 5 b 1 / ppppppppp / 9/9/9 / PPPPPPPPP / 1 B 5 R 1 / LNSGKGSNL