Steno-Chess

 

 

Steno-chess (SC) proposes itself to play with a series of simple chess instructions, assembled in a character string.

 

Example of such a string : ghLxLR3xo#

 

Here is the complete SC instruction set (all the traditional chess rules are kept):

 

a = occupy a square on the a-file (either capturing or not)

b = occupy a square on the b-file (either capturing or not)

c = occupy a square on the c-file (either capturing or not)

d = occupy a square on the d-file (either capturing or not)

e = occupy a square on the e-file (either capturing or not)

f = occupy a square on the f-file (either capturing or not)

g = occupy a square on the g-file (either capturing or not)

h = occupy a square on the h-file (either capturing or not)

 

1 = occupy a square on the 1-rank (either capturing or not)

2 = occupy a square on the 2-rank (either capturing or not)

3 = occupy a square on the 3-rank (either capturing or not)

4 = occupy a square on the 4-rank (either capturing or not)

5 = occupy a square on the 5-rank (either capturing or not)

6 = occupy a square on the 6-rank (either capturing or not)

7 = occupy a square on the 7-rank (either capturing or not)

8 = occupy a square on the 8-rank (either capturing or not)

 

P = play a Pawn (either capturing or not)

R = play a Rook (either capturing or not)

N = play a Knight (either capturing or not)

L = play a Bishop (either capturing or not – L stands for the german Lδufer)

Q = play a Queen (either capturing or not)

K = play your King (either capturing or not; castling allowed)

 

x = make a capture (en passant or not)

% = make an en passant capture

~ = play a move (a legal move, of course – as all moves here)

+ = put your opponent’s King in check (simple check, double check, discovered check, or by promoting a pawn)

= = stalemate immediately

# = checkmate your opponent’s King (directly or by discovered check)

 

o = castle to the kingside

0 = castle to the queenside

r = promote a Pawn into a rook

n = promote a Pawn into a knight

l = promote a Pawn into a bishop

q = promote a Pawn into a queen

 

[One will keep in mind the difference between o and 0]

 

A string is read left to right. Odd instructions are for White, even instructions for Black.

 

Now, let us look again at the example on top of page. The string ghLxLR3xo# should be read like this (in absence of other indications, the string of instructions starts with the first move) :

 

White has to move a piece in order to occupy a square on file g (either capturing or not)

 

Black has to move a piece in order to occupy a square on file h (either capturing or not)

 

White has to move a Bishop (either capturing or not; either giving check or not)

 

Black is forced to make a capture somewhere on the board (x)

 

White has to move a Bishop (either capturing or not; either giving check or not)

 

Black has to move a Rook (either capturing or not; either giving check or not)

 

White has to move a piece in order to occupy a square on rank 3 (either capturing or not)

 

Black is forced to make a capture somewhere on the board (x)

 

White has to castle on the kingside (o)

 

Black has to checkmate his opponent (#).

 

 

Steno-Chess is not a new standard for describing chess positions; its aim is to play with strings of instructions which may seem, at first glance, weird or contradictory.

 

As one will quickly notice, the “standard ASCII” SAN notation (or even the Chess Informant’s one) can lead to several SC strings. For example, the short game:

 

1.g4 h5 2.Bg2 hxg 3.Bxb7 Rxh2 4.Nh3 BxB 5.0-0 Rh1#

 

... could produce, among others, SC strings like ghLxxR3xo1, 45ghLxNLoh or ghLxLR3xo# (the latter being the one which opens the page).

 

The aim of Steno-Chess, in reality, is to play with the assumed blur of it’s own set of instructions.

 

How about, for instance, trying to replay the following game? But take care: the seemingly haziness attached to some moves disappears when you look further in the string. Every move is forced, in fact – and this is the beauty (?) of the exercise:

 

dg6LxgxK+x5Nx4+NxLgx+N1+x2xg+5ebxR6+dQNQg4~#

 

 

Something else. Nicolas Graner (a friend of mine) warned me, when we had our first discussion about SC:

 

“With your system, it is impossible to describe the move < 1.a3 > because the notation < P > doesn’t fit (too ambiguous – there are eight possible pawns), neither < a > (three movements are possible, bringing a piece on the a file), nor < 3 > (twelve movements – between Knights and Pawns – fulfil the requirement of occupying a square on the 3-rank)”

 

I’ve answered him that SC are not to describe a game or a standard sequence of move (as we have seen), but to build labyrinths through which only one path leads to the exit. Nicolas’s remark, however, was still challenging me... So I tried yesterday (February 29th, 2004) to find SC strings (the shortest ones) in order to fix all the twenty white moves which can open a real game.

 

Here is the (almost) full display. A single line should be read like this: “If you obey the string at the right of the arrow, you cannot play another first move than the ASCII one at the left”.

 

1.a3 ——> 3e2x

1.a4 ——> ab3x

1.b3 ——> be33

1.b4 ——> b~5

1.c3 ——>  ?

1.c4 ——> cb5x

1.d3 ——> 3gK+

1.d4 ——> dex

1.e3 ——> 3f+

1.e4 ——> 4f+

1.f3 ——> 3~~#

1.f4 ——> 4Nf+

1.g3 ——> gd23

1.g4 ——> g~5

1.h3 ——> 3d2x

1.h4 ——> hg5x

1.Na3 ——> a~1

1.Nc3 ——> c~1

1.Nf3 ——> f~1

1.Nh3 ——> h~1

 

Here is (march 4th, 2004) the same exercise for the first twenty black moves:

 

1. ...a6 ——> NaNx

1. ...a5 ——> bax

1. ...b6 ——> ab5x

1. ...b5 ——> abx

1. ...c6 ——>  ?

1. ...c5 ——> bcx

1. ...d6 ——> c6+

1. ...d5 ——> cdx

1. ...e6 ——> ~6~#

1. ...e5 ——> dex

1. ...f6 ——>  ?

1. ...f5 ——> efx

1. ...g6 ——> hg5x

1. ...g5 ——> fgx

1. ...h6 ——> NhNx

1. ...h5 ——> ghx

1. ...Na6 ——> eNx

1. ...Nc6 ——> ~c~8

1. ...Nf6 ——> ~f~8

1. ...Nh6 ——> dNx

 

We will leave to the reader the pleasure of finding the 4-symbol strings above which were replaced by < ? >. Answers will be posted soon here...

 

We would be delighted if some composers should adopt the Steno-Chess notation. This would enrich the beautiful domain of no-diagram chess (link in French).

 

__________

 

Thanks to Gilles Esposito-Farθse for his remarks and for suggesting me the % symbol. Many thanks too to Mario Richter who suggested me a lot of improvements in the English notation of promoted pieces – and for allowing the King to castle when it has to obey the K instruction! Mario checked and corrected a lot of the above strings – thanks again! Thanks too to Olivier Pucher for the = symbol and for his enthusiasm in playing with SC strings (see here). Finally, thanks to Antoine Fourriθre for having recorded SC on the ChessVariants server – and for having re-worded in good English the above rules!

[Last update of this page : march 9th, 2004]

French original of this page, click there.

Main page of this site (in French), here.