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This is the full version of the quiz that I wrote first. It uses the
ArrayValues class which is described in my previous email. I think it
is adequately documented as it is, especially because the algorithm and
main logic parts are described in the previous email. Run with no
options to get the usage. One thing to say, though is that the facets
bracket method is basically this:
class String
def bracket(wrapper)
wrapper + self + wrapper
end
end
It is actually more complex, there is a second argument you can pass in.
daniel@daniel-desktop:~$ cat chess960.rb
#! /usr/bin/ruby -w
require 'arrayvalue.rb'
require 'rubygems'
require 'facet/string/bracket'
# Represents a row ("rank") on a chess board
class ChessRow < Array
def initialize
replace(Array.new(8))
end
# Sets the specified vacant square to the specified piece, with
nthVacant starting at 0.
def setVacantSquare(nthVacantSquare, piece)
to_av.select{|x| x.nil?}[nthVacantSquare].set(piece)
end
def to_s
collect{|x| x.bracket(" ")}.join("|").bracket("|")
end
end
class Chess960Row < ChessRow
KeRN = <<-END.split("\n").collect{|x| x.split(" ")}
N N R K R
N R N K R
N R K N R
N R K R N
R N N K R
R N K N R
R N K R N
R K N N R
R K N R N
R K R N N
END
def setFromNum(id)
# Set the bishops, light first then dark.
1.downto(0) do |x|
self[(id % 4)*2 + x] = "B"
id /= 4
end
# Set the queen
setVacantSquare(id % 6, "Q")
id /= 6
# Set everything else using KeRN codes.
KeRN[id].each do |currentPiece|
setVacantSquare(0, currentPiece)
end
self
end
end
Pawns = ChessRow.new.fill("p").to_s
EmptyRows = [ChessRow.new.fill {|i| i % 2 == 0? " " : "#" }.to_s,
ChessRow.new.fill {|i| i % 2 == 1? " " : "#"
}.to_s]
Spacer = "+---" * (Pawns.to_s.length / 4) + "+"
def parseInput(input)
case input
when nil
puts "Usage:",
"\tchess960 all - Print all the
possible Chess960 lineups",
"\tchess960 rnd - Print a random
Chess960 lineup",
"\tchess960 ID - Print ID Chess960 lineup"
when /all/
0.upto(959) {|x| parseInput(x) }
when /(ra?nd)/
parseInput(rand(960).to_i)
else # is a number
input = input.to_i % 960 # Change 960 into 0.
mainRow = Chess960Row.new.setFromNum(input).to_s
[input.to_s + ": ",
mainRow.downcase,
Pawns.downcase,
EmptyRows * 2,
Pawns.upcase,
mainRow.upcase].
flatten.each{|x| puts x, Spacer}
end
end
parseInput(ARGV[0])
Ruby said:
The three rules of Ruby Quiz:
1. Please do not post any solutions or spoiler discussion for this quiz until
48 hours have passed from the time on this message.
2. Support Ruby Quiz by submitting ideas as often as you can:
http://www.rubyquiz.com/
3. Enjoy!
Suggestion: A [QUIZ] in the subject of emails about the problem helps everyone
on Ruby Talk follow the discussion. Please reply to the original quiz message,
if you can.
-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=
by Kieran Wild
Chess960, is a chess variant produced by Grandmaster Bobby Fischer by
formalizing the rules of Shuffle Chess. Its goal was to create a chess variant
in which chess creativity and talent would be more important than memorization
and analysis of opening moves. His approach was to create a randomized initial
chess position, which would thus make memorizing chess opening move sequences
far less helpful. The initial position is set up in a special way and there are
960 such positions, thus the name Chess960.
The starting position for Chess960 must meet certain rules. White pawns are
placed on the second rank as in chess. All remaining white pieces are placed
randomly on the first rank, but with the following restrictions:
* The king is placed somewhere between the two rooks.
* The bishops are placed on opposite-colored squares.
The black pieces are placed equal-and-opposite to the white pieces. For example,
if the white king is placed on b1, then the black king is placed on b8. Note
that the king never starts on file a or h, because there would be no room for a
rook
Can I suggest a nice little ruby program to generates all 960 possible starting
positions and outputs a random one on request.
Output could be as follows.
Starting Position 432:
White
a1 b1 c1 d1 e1 f1 g1 h1
N B B R K R Q N
Black
a8 b8 c8 d8 e8 f8 g8 h8
N B B R K R Q N
Or some better output.
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