Free Chess ebooks and Chess code implemented in Lua/Lunacy
This 800-page ebook has 9600 mate in one puzzles based on positions from human play over at lichess.org. In all positions, White can move and deliver mate in one.
The ebook is public domain; it uses a slight variant of the freeware Chess Merida font as well as Charis SIL for the text on each page.
The file ChessStuff.lua, in addition to having a library with a very basic understanding of Chess, will also read from standard input mating puzzles as they exist over at https://database.lichess.org and output the puzzles as diagrams which will look good when printed with a chess diagram font.
To to this, have Lua installed, then run this script:
head -362 mateInOne.csv | lunacy ChessStuff.lua > foo.txt
foo.txt will now be a file which, if opened with a word processor and
rendered with the Chess Merida (or any compatible) font, will render a
bunch of pretty mate in one chess puzzle diagrams.
The mateInOne.csv file shows mating positions, all from actual games
of chess played (no composed puzzles).
While the FEN fields in mateInOne.csv all show Black having the move,
in Lichess’s database of chess puzzles, the position right before the
puzzle is shown in the FEN, then the first move is made. All of
these puzzles have White move and deliver mate in one. Fields:
- The first field is a pseudo-random number: The first 32 bits of the RadioGatún[32] sum of the FEN of the previous position.
- The second field is the position before the move which allows a mate in one.
- The third field starts with the move that allows mate in one, then a move that will deliver mate (note: In many positions, multiple mates are possible).
- The fourth and final field is how difficult the mate should be to solve; higher numbers are harder puzzles.
We have, in mateInOne.csv, 115,436 brilliant ways for White to mate in one move.
To sort the positions by difficulty (easiest first) in Linux/*NIX:
<mateInOne.csv tr -d '\015' | awk -F, '{print $4 " " $0}' | sort -n > f.csv
Hardest first:
<mateInOne.csv tr -d '\015' | awk -F, '{print $4 " " $0}' | sort -nr > f.csv
See the following repos for fonts with chess pieces:
https://github.com/samboy/ChessGraphics