David Lau for giving me so many of my favorite riddles: glass half full, single file exec,
where's the father, globe traversal, 100 prisoners and a light bulb,
simultaneous hat color guessing, manholes ... the list goes on ...
naturally inquisitive and a great friend
Siddhartha Doshi for all those riddles in cs150 lab (e.g. birthday twins, rope burning)
Jiong Shen hkn challenge: circular jail cell
Carl Wang tbp challenge: arab sheikh camels and square division
William Kahan four ghost ships problem, math h90 putnam problems, borromean circles, moonstone,
smarter than MENSA, derivative cancellation, collector violins,
pentagon puzzle
Phoebus Chen for relaying Kahan's riddle to me
Alan Liu mystery matrix solution
Hansen Bow cigarettes, light physics, message reconstruction, minimax hamming distance
... one of the sharpest people in berkeley and a good research partner
Ernest Zhu the bachelor's problem, ghetto encryption I, hanging chain
Elaine Lo rotated sorted list search
Yosen Lin for hundreds of AIM sessions, always being open to new puzzles, and hacking them
till dawn with me just for the hell of it; array rotation, dating
possibilities, randomized icecream / id numbers coauthor, triangle
interior problem from topcoder, hal 9000 problem from topcoder,
road layout from topcoder, implementing hide tags in YaBB,
worm propagation, polygon area
Don Barkauskas error in prime pairs riddle: prime triples are illdefined
Katherine Chan japanese sangaku geometry I solution
Jasvir Nagra japanese sangaku geometry II solution in postscript, 100 prisoners and two bulbs
Tau Beta Pi (TBP) for a few puzzle challenges
Eta Kappa Nu (HKN) for many puzzle challenges and puzzle loving people
Danny Dulai eight queens
Samuel Vimes nonhomogeneous ropes typo
Dipan K. Ghosh twelve balls riddle
Eric Cole twelve balls riddle
Louis Wainwright guess number for money I
Ben Bardill hospital elevator testing
Patrick Dreker register value swap
Autumn Looijen knight vs. dragon
Stephen Champailler zeno's paradox's reference from godel, escher, bach
Christopher KingsLynne coin unbiasing
Bart Samwel fork in the road I clarification
Kannan Ramchandran 3bit sensors; my EE research professor, also a riddle lover
Nick Yee chocolate milk misphrasing, ghetto encryption I alternative phrasing
Steve Plimpton chocolate milk misphrasing
Levsen Hendrik chocolate milk misphrasing
Remco Hartog broken clock, impatient patients
[I.M._Smarter_Enyu] pop quiz
Philip Mock 8way circle division
Michael Chang uc berkeley in sf business district, coconut monkey typo
Jon Meilstrup number spiral error
Ryan Russell number spiral error, ones in a register solution
Matt Young number spiral error
Jonathan Haas robot collision programming, button trap generalization, smullyan was wrong
Geoff Canyon debastardization of stupid poem
Peter Surda logical signs I unconventional analysis
Cory Ondrejka anchor, add one without + or ; problems from game companies
Satish Rao egg dropping, max sum in integer array; my CS170 (algorithms) professor
[gcooper] what happened I
Andrew Blair globe traversal confusing wording: cannot move in any direction you want
Ted Powell error in family relations riddle; wording of 8 queens problem
Brave Sir Robin moving bus direction
Eric Cole new door scramble
J. A. H. Hunter for making a problem that the bus passengers problem is modeled after
Sean R. Owen sink the sub, repeated number rephrasing, shuffling cards
Andrew Glenn sink the sub
Bruce Preston calendar cubes II, with a beautiful GIF showing a solution
Peter Ratiu japanese sangaku geometry III solution, with AutoCAD screenshots
Michael Mendelsohn japanese sangaku geometry III solution
Rob Mahurin japanese sangaku geometry III solution
James Fingas a very creative and amusing canuck. japanese sangaku geometry III solution,
willy's true colors, fork in the road III, love triangle, love square,
crazy sprinkler, cryptic address, finger gauges, cooperative checkers,
three primates, two gambling machines
Bryan Organ japanese sangaku geometry III solution
Jeroen Rutten japanese sangaku geometry III solution
S. MontgomerySmith japanese sangaku geometry III solution
Marko Lukat japanese sangaku geometry III solution, with beautiful .BMP diagram
Eric Yeh a genuine puzzle fanatic whom i'm overjoyed to have met.
past present future, generalization of egg dropping, generalization of
single file hat execution, coin flip game worth, envelope gamble II,
24 II, duck in pond, lion and tamer, 1000 wires, infinite checkerboard,
picard theorem proof that 0 = 1, gods of gibberland, operators of
boolania, the puzzle forum, shuffling cards, forcefield detainment
Nick Hobson magnet detection, 24 III, 271, ant on a box, folded sheet of paper,
farmer's enclosure, 2n+1 coins, two ladders, making a dollar,
sum of reciprocals, cyclic hexagon
length of hypotenuse
Mike Lawther 27 cubes
Richard Feynman sprinkler and pump
Douglas Hofstaeder zeno's paradox tortoise and hare story
Dacher Keltner ice cream urban riots; my psych 160 (social psych) professor
David Mace tooth fairy company
[SAS] chain link 21
Matthew Schultheis placing trees
John Leen analog clock III; one of my CS170 (algorithms) T.A.s
Andrew Ooi party handshakes
Folkert Hindriks hanging vs beheading
Steve Ragle glass half full clarification: nonopaque sides, family relations
clarification: "dude" could be anyone
Daniel Filner Joel Schumacher movie solution to what happened I
Karl Barrus nth from end
Misha Kruk for loop tweaks (in three ways), excel simulator
Keith Lloyd chess puzzle I and II confusing wording: "attack" vs. "move to"
Dave Minott 222
Jette Randlov all horses same color
Eric Winger light bulb switches rephrasing
Tom VanCourt anchor, balloon in car
Chris Seaton desperados in jail
Mitchell Morris ladder rungs
Michael Styer racetrack laps
Zameer Andani repeated number confusing wording
Jonathan Blow storage algorithm solution
Jeff Thompson storage algorithm solution
Jonathon Duerig storage algorithm solution
Dan Hanson storage algorithm solution
Gabriel Sechan storage algorithm solution
Tom Saxton storage algorithm solution
[HunterWare] storage algorithm solution
[alsee] storage algorithm solution
James Antill storage algorithm solution
Tom Barringer mean, median, neither solution: "median"
Bart Massey mean, median, neither solution: "mean", ones in a register solution,
storage algorithm demystification
David Krikorian mean, median, neither solution: "neither"
Eric Sharkey mean, median, neither solution: "neither"
[tudorb] ones in a register solution
Kevin Day ones in a register solution
Milan Ramaiya ones in a register solution
Robert Merkel ones in a register solution, fsck the marble jar system
James Jones ones in a register solution
Haim Bitner ones in a register solution
Adam Barth ones in a register solution
Oscar Lazzarino ones in a register solution
Damien Fisher ones in a register solution
[DrkShadow] ones in a register solution
Erik Blankendaal ones in a register solution
Eric Smith ones in a register solution
J.Demmel & J.Shewchuk punchout cards, sweetheart mix tape
Alex Harris nonconstructive p=np, supervillain transparencies, x^x
Michael Kelley knight tours
[Mr._Martingale] introductions all around
Kaisen Lin 3 enemies
Hakan Yilmaz mean distance two points
Freddy Mercury paper: "the best card trick", mathematical intelligencer 24 winter 2002
Justin Rising how many stars in the universe, evil mayor
Marko Lukat ladder into tower
William Kahan four ghost ships, putnam exam problems
Jeremy Randolph feminist rule
Michael Sinatra slashdot effect traffic analysis
David Messerschmitt every die face, circuit failure analysis
Patrick Masterson dice corner, poison drinks, trees for willywutang,
singleinstruction computer, hotel infinity
Frederik Bonte kabouters
Randy Williams train bridge
Pietro K.C. 2sat to 2col, partition, wine and water, gas stations, triangular numbers
Chris Jackson mystery matrix II
Brett Danaher rumor spreading
Derek Abbott twogirlfriends paradox
Ralph Boleslavsky 100 m race, positive matrix sums
Rui delNegro what happened II, what happened III, what happened IV
Jason Behrstock bright and dark stars
[college math journal] proof y equals zero (25 #1 Jan 1994 p.35)
[amer. math monthly] rectangle into square (78 #7 Aug.Sept. 1971.),
brick piercing (78 #7 augsept 1971)
Spyros Potamianos coin biasing (variation of coin unbiasing)
Gary Hsieh missing integer in array
[rec.puzzles] high buildings and street vendors (11 Apr 1996)
Steven Rudich good and bad computers
Matt Lahut relaying the good and bad computers riddle to me, loaded craps dice,
penny track game, selfprinting program, peg solitaire, jewel thieves
Richard Reti chess study I, chess study II
Paul Sinclair an everpresent source of wisdom, graciousness, and witty humor in the forums. trianglia II, all sigs are false, newcomb's dilemma, steiner ellipses, 10adic numbers. thanks for all your contributions to maintaining the forum.
Tim Mann perfect powers, obtuse triangles (martin gardner)
[ucb engineering news] the clever grandfather, twiddling bolts
Luke Percival positive matrix sums, card simulation
Richard M. Karp knight circuit time, always ahead, calling a card's color
Anwis Das infinite resistor network, closest point
Mike White log motor
Louise Poon stuck in a box
Jeffrey Wilhelm remote control design
Anthony Cammon conway sequence
[BNC] for relaying the take the last chip puzzle to me,
acrobat thief and golden rope, century's last day, match puzzles,
match equations, too many solutions, sum of real numbers
A.Frieze & D.Sleator take the last chip
[SWF] arrange the 13 pieces
T.Stevens & F.Wang dog, chicken, rice
Danny P dog, chicken, rice
Patrick Sesulka money in book
[towr] our most prolific forum poster :) dog, chicken, rice correction. wrote a very useful latex2png formula generator. thanks for all your work in maintaining the forum!
Chi Sum Cheung dog, chicken, rice correction
Brandon McPhail topological rings
Andrew Gottelieb what's the temperature outside
Ranjit Jhala DFA design I: LR and RL products
Jacob Scott stack indexing
David MacKay corrected phrasing of several puzzles, three collinear points, erik's puzzle,
southeast
Eamon Warnock impish pixie, ESP puzzles, chess game reconstruction, retrograde chess I,
(THUDandBLUNDER) rope around the earth
Kozo Morimoto two identical spheres
Abhijit Joshi samwise and gandalf
Devesh Parekh php script for piping puzzles into mysql database
Amnon Melzer path collision, bicycle tugging
Mary Lou river crossing
Leonid Brouhkis typewritter gibberish
Allistair Sinclair oracle queries, quiz team scheduling, unrecognizable language
Mark Newheiser elegantly greedy pirates
Joc Koelman random points on sphere
Paul Jung temperature antipodes
Aryabhatta number of midpoints
Thomas Cover convex set projection
Barukh guessing cards suit, prolong the line
Nootch dominant fifth
Eigenray coloring the rational plane
