Peanuts Trivia Quizzes
Peanuts comic strips
Peanuts reruns date conversion chart
Peanuts: Years in review
Peanuts Books Wishlist
[For Better or For Worse]
[Pearls Before Swine]
[Cul de Sac]
[Off The Mark]
Pseudoku puzzles (i.e., Sudoku variants)
that I composed for G4G7
Gathering for Gardner)
and some Christian news satire of my own
Some poems that I’ve written
A premise for a movie that I would love
to see made
Goodman’s original definition of grue
Math in the
archive (jokes; some are offensive)
Look up words at
Comparison shop for books at
What does your phone
Foreign currency exchange rates
Kim and John Langdon]
Othello programs (the best is
applets (the best ones are
Second Chance Cinema
My Chess Problems
I have composed a few unusual chess problems.
In Ein Kleines Schach, the game is played on
a Klein bottle (click here
for the solutions).
The remaining problems take place on a standard board,
but for the next two problems,
you need to know what “free-capture chess” is.
In free-capture chess, you may capture not only your opponent’s units,
but your own units as well (except that your own units do not check or capture
your own king).
The problem below was first published as problem F159 in
33. White to move and mate in 2 (free-capture chess).
The next problem, whose composition was a collaborative effort
with Philip Lin, was first published in 2003, as F0149 in issue SG23 of
It has two parts. Part (a) is a helpmate in 2 (i.e., Black and
White cooperate to checkmate Black after each player makes two moves,
with Black moving first); standard rules of chess apply.
Part (b) is also a helpmate in 2, with exactly the same position,
but with the free-capture rule in force.
For the 1996
MIT Mystery Hunt, I composed the following problem.
Find the shortest legal chess game that results in the position below.
For the 2013
MIT Mystery Hunt, I composed the two positions below.
In each case, determine if the position could arise in a legally played chess game,
and if so, whose turn it is to play.
(These problems were also reprinted in the
of MIT Technology Review, in the
and July/August 2019
In 1987, John Beasley introduced a fairy condition called
fuddled men: a piece (or pawn) cannot move two times in succession;
having moved, he must remain stationary
for a move before being able to move again
(and, while immobilized, he can neither check nor pin).
The two positions below illustrate the fuddled men concept.
On the left, it is White to move and mate in 2;
I composed it myself before discovering that it had been almost
anticipated by Ronald Turnbull (see position 4 in
article), but my version has some new features.
The position on the right is a PG9.5, meaning that White has
just made his 10th move of the game, and you must reconstruct how the game went.
It is a joint composition with Noam Elkies, who cooked and corrected
my first attempt.
For more information about chess problems, see the
chess problem glossary from
Chow’s Checkerplay Challenge #1
Chow’s Checkerplay Challenge #2
Chow’s Checkerplay Challenge #3
One-page summary of backgammon opening replies
Rollouts of positions from
Robertie’s 501 Essential Backgammon Problems
Rollouts of positions from
Wiggins’s Boards, Blots, and Double Shots
Are there undefined equities in backgammon?
Equities for Murat’s
[C source code]
[Backgammon value = 1]
[Backgammon value = 2]
your ability to estimate EPC
backgammon puzzles by Bill Davis and Ed Collins
Notes by Stick:
[EPC Part 1]
[EPC Part 2]
Peever backgame quiz (Memorial Day 2013)
Nigel Merrigan’s Dual E-Pip/Metric Formula for
“Naccel” pip-counting (cached from BGOnline; internal links may not work):
Backgammon stoplight charts
backgammon quizzes by “Othello” Itikawa and others
Stick’s Backgammon Forum
(use this page to make
diagrams for posting on Stick’s forum)
Some of my favorite posts:
- Interesting positions
- Stick’s DMP Quiz
- Slot or break the midpoint?
- XG version 1 does not double
(Click here for XG2 rollout)
- World passes Denmark’s redouble to 4
(and analysis of recube vig)
- “Firing squad” quiz
- GNU sides with me against Stick, neilkaz, and Nack
(Click here for XG2 4-ply rollout)
- rew’s difficult technical checkerplay
- The original “Bagai position”
7 (Number 2),
- Difficult Pottle-vs-2pt position posted by Mochy
- Mochy’s life is too short to understand BG perfectly
- Seven of my favorite positions from 2011
- Michael Depreli’s shocking 33
- Carlo Melzi’s super QF problem
- Three plays from Peever vs. Kenji
- Do you have the guts to hit? (and some similar problems)
- XG 3-ply plays a double whopper against a blotty board
- Chris Bray’s favorite position from 2014
- A Four Score position from Nack Ballard
- Michael Depreli 32 to play (and variant)
MIT IAP Mystery Hunt
(perhaps the world’s best team competition)
(lots of classic chestnuts)
World (mechanical puzzles)
(mechanical puzzle solutions)
The Grey Labyrinth
(new puzzles all the time!)
(puzzles with strong mathematical content)
(a small selection of highly original puzzles)
Gathering for Gardner
Where I Got My Gifs
When I downloaded free GIFs from these sites, I agreed to link to them
from my own page. However, their URLs seem to keep changing.
I try to keep up with this constant flux, but sometimes it’s impossible.
In one case the site seems to have been absorbed into a larger entity,
so I have dropped it from this list.
[The Graphic Station]