CLI for chess-steg - a chess steganography for hiding messages in chess games
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README.md

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chess-steg-cli

This is a cli that uses chess-steg, the awesome work by James Stanley

chess-steg is a tool to encode/decode short messages as chess games.

Too unwieldy for large content, but I believe it technically has no limit on the amount of data it can encode as it ignores draw by repetition and the 50 move rule. Perhaps it can break in some situation where a player is left with playing a checkmate as his only legal move?

This game encodes the text "Hello, world!":

  1. e3 b6 2. b3 Bb7 3. Nf3 Bxf3 4. Bd3 e6 5. h4 g6 6. b4 h5 7. gxf3 c5 8. Bb2 a5 9. Rh3 e5 10. c4 Bh6 11. Be2 Ke7 { White resigns. } 0-1

More information in James Stanley's blog post: https://incoherency.co.uk/blog/stories/chess-steg.html

Help

Option Description
-v, --version Output the version number
-h, --help Display help
-s, --steg Steg string
-u, --unsteg Unsteg chess PGN, lichess url or lichess ID
-o, --open Open steg PGN in browser
-w, --without-blunders (un)steg without blunders (disabled by default)
-d, --debug Debug error messages

Requirements

Install node.js

Installation

Globally

npm i -g chess-steg-cli
# Then use the "chess-steg" to run it
chess-steg

Without installation - npx

npx chess-steg-cli

Steg examples

# Steg
chess-steg -s "hello world"
# Outputs: 1. e3 Nh6 2. d4 Nf5 3. Qd2 Rg8 4. Ne2 c6 5. b3 d6 6. a3 Be6 7. d5 Kd7 8. Qd3 Kc8 9. Qb5 b6 10. Ng1 { Black resigns. } 1-0
# Copies output to clipboard

# Steg and open in browser
chess-steg -o -s "hello world"
# Outputs: 1. e3 Nh6 2. d4 Nf5 3. Qd2 Rg8 4. Ne2 c6 5. b3 d6 6. a3 Be6 7. d5 Kd7 8. Qd3 Kc8 9. Qb5 b6 10. Ng1 { Black resigns. } 1-0
# https://lichess.org/ZKWeECmI
# Copies url to clipboard

# Steg without blunders
chess-steg -w -s "hello world"
# Outputs: 1. Nf3 g6 2. e3 Bh6 3. a3 d6 4. Bb5+ Kf8 5. Ng1 e5 6. f3 c5 7. a4 Qc7 8. Kf2 a6 9. Bc4 Nc6 10. e4 Ke7 11. d3 Qd7 12. Ke1 Bg7 13. f4 Nb8 { White resigns. } 0-1

Unsteg examples

# Unsteg
chess-steg -u "1. e3 Nh6 2. d4 Nf5 3. Qd2 Rg8 4. Ne2 c6 5. b3 d6 6. a3 Be6 7. d5 Kd7 8. Qd3 Kc8 9. Qb5 b6 10. Ng1 { Black resigns. } 1-0"
# Outputs: hello world

# Unsteg and open in browser
chess-steg -o -u "1. e3 Nh6 2. d4 Nf5 3. Qd2 Rg8 4. Ne2 c6 5. b3 d6 6. a3 Be6 7. d5 Kd7 8. Qd3 Kc8 9. Qb5 b6 10. Ng1 { Black resigns. } 1-0"
# Outputs: hello world
# https://lichess.org/ZKWeECmI

# Unsteg without blunders example
chess-steg -w -u "1. Nf3 g6 2. e3 Bh6 3. a3 d6 4. Bb5+ Kf8 5. Ng1 e5 6. f3 c5 7. a4 Qc7 8. Kf2 a6 9. Bc4 Nc6 10. e4 Ke7 11. d3 Qd7 12. Ke1 Bg7 13. f4 Nb8 { White resigns. } 0-1"
# Outputs: hello world

# Unsteg from lichess ID (last part of lichess url)
chess-steg -u ZKWeECmI
# Outputs: hello world

# Unsteg from lichess url
chess-steg -u https://lichess.org/ZKWeECmI
# Outputs: hello world

License

MIT