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 » Wicked problem - Wikipedia, the free encyclopedia http://en.wikipedia.org/wiki/Wicked_problems
 » IMO problems http://www.kalva.demon.co.uk/imo.html
 » L-99: Ninety-Nine Lisp Problems http://www.ic.unicamp.br/~meidanis/courses/mc336/2006s2/funcional/L-99_Ninety-Nine_Lisp_Problems.htm ...
 » Embarrassing Problems http://www.embarrassingproblems.co.uk/
 » List of unsolved problems - Wikipedia, the free encyclopedia http://en.wikipedia.org/wiki/List_of_unsolved_problems
 » Millennium Prize Problems http://www.claymath.org/millennium/
 » ChessProblems http://www.chessproblems.com/index.html
 » ChessProblems http://www.chessproblems.com/
 » Retriever pet care guide: Golden retriever medical problems http://www.retrieverguide.com/golden-retriever-medical-problems.htm
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 algorithms  chess  children  competition  contest  education  entertainment  fun  games  geek  imo  math  mathcounts  mathematics  olympiad  physics  problemsolving  programming  puzzle  puzzles  reference  research  science  solutions  tactics

Discover From This Topic & Page:  [] IMO problems http://www.kalva.demon.co.uk/imo.html
 [] Interactive Mathematics Miscellany and Puzzles, Index http://www.cut-the-knot.org/index.shtml (games puzzles fun mathematics)
 [] IBM Research | Ponder This http://www.research.ibm.com/ponder/ (puzzles ibm programming math)
 [] Millennium Prize Problems http://www.claymath.org/millennium/ (mathematics problems science contest)
 [] Project Euler http://projecteuler.net/index.php?section=view (programming math puzzles puzzle)
 [] Main Page - ExampleProblems.com http://www.exampleproblems.com/wiki/index.php/Main_Page (mathematics physics resources reference)
 [] Art of Problem Solving http://www.artofproblemsolving.com/ (math mathematics problemsolving reference)
 [] MATHCOUNTS DRILLS http://mathcounts.saab.org/mc.cgi (math education mathcounts problems)
 [] Chess Tactics http://chesstempo.com/ (chess tactics problems programming)
 [] problems in Perl 6 http://svn.pugscode.org/pugs/t/examples/99problems/ (programming perl tutorial programminglanguages)
 [] online-judge.uva.es - PROBLEM SET ARCHIVE http://acm.uva.es/p/ (programming algorithms puzzles acm)
 [] Home | Open Problem Garden http://garden.irmacs.sfu.ca/ (math research problems mathematics)
 [] Putnam Directory http://www.unl.edu/amc/a-activities/a7-problems/putnamindex.shtml (problems solutions mathematics math)
 [] Puzzles.COM Home http://www.puzzles.com/index.htm (games entertainment fun children)
 [] [ wu :: riddles(intro) ] http://www.ocf.berkeley.edu/~wwu/riddles/intro.shtml (puzzles brain games riddles)
 [] Kalva homepage http://www.kalva.demon.co.uk/ (problems mathematics math reference)
 [] International Mathematical Olympiad / Olympiade internationale de mathématiques http://imo.math.ca/ (mathematics ebooks olympiad problem)
 [] Unsolved Problem of the Week Archive http://cage.rug.ac.be/~hvernaev/problems/archive.html (mathematics reference problems)
 [] IMO problems http://www.kalva.demon.co.uk/imo.html (problems mathematics olympiad imo)
 [] MATHCOUNTS Archive [Goodly Maths] http://goodlymaths.0catch.com/contests/mathcounts/mathcounts_archive.htm (mathcounts problems math)
 [] Challengelist http://www.research.att.com/~dsj/nsflist.html (algorithms problems research science)
 [] William Lowell Putnam Competition Archive http://www.unl.edu/amc/a-activities/a7-problems/putnam/ (fun mathematics problems competition)
 [] Problem Solving and the Putnam Competition http://www.math.hmc.edu/putnam/ (problems competition math putnam)
 [] Sphere Online Judge (SPOJ) - Problems https://www.spoj.pl/problems/classical/sort=0,start=0 (programming problems)
 [] problemist.com http://www.problemist.com/ (chess problems)
 [] Olympiad Math Madness http://www.geocities.com/CapeCanaveral/Lab/4661/ (olympiad mathematics problems math)
 [] edusadier - EL ARTE DEL MATE EN DOSThe Art of Direct Mate in Two Eduardo SadierEl Palomar - Buenos ... http://edusadier.googlepages.com/home (chess problems)
 [] problemcorner.org http://www.problemcorner.org/ (problems math)
 [] Problems and Puzzles [mathschallenge.net] http://mathschallenge.net/index.php?section=links&type=problems (problems math)
 [] Dr. Dobb's | The Maximal Rectangle Problem | April 1, 1998 http://www.ddj.com/184410529 (maximum points rectangle algorithm)
 [] Yet Another Rosetta Code Problem (Perl, Ruby, Python, Haskell, ...) http://perlmonks.org/?node_id=632023 (programming problems python ruby)
 [] Aboard Puzzle Depot: Puzzle Library of Crosswords, Logic and Word Puzzles http://www.puzzledepot.com/puzzles.shtml (problems puzzles)
 [] The ACM-ICPC Live Archive http://icpcres.ecs.baylor.edu/ (algorithms problems contest)
 [] Quantum Mechanical Wavefunctions http://www.krellinst.org/UCES/Demo/ChemistryLaboratory/lab2/Lab2/Lab2.html (physics mechanics problems quantum)
 [] Course materials for PH2310 http://www.ph.rhul.ac.uk/course_materials/PH231/ (physics optics problems examples)
 [] EText & EBooks: Chess Problems http://www.anders.thulin.name/SUBJECTS/CHESS_PROBLEMS/ (chess problems)