Questions tagged [no-computers]
A puzzle designed to be solved without using calculators, online decoders or computer programming.
487
questions
8
votes
2answers
230 views
Hand tiling puzzle demonstrating Eisenstein triple $c^2 = a^2 -ab + b^2$
An Eisenstein triple is related to 60 degree triangles and a special case of the cosine law. But we need not worry about that except to note that a specific example of an Eisenstein triple is $7^2 = 5^...
10
votes
3answers
284 views
Four hand tiled squares demonstrating a Pythagorean Quadruple
Demonstrating the Pythagorean Quadruple
$6\times6 + 6\times6 + 7\times7 = 11\times11$
Using the pieces shown in the $11\times11$ square:
The objective:
Arrange the pink pieces (four enneominoes) ...
4
votes
0answers
135 views
The Rambling Monster
The Rambling Rook is back, but this time, they are a true monster!
It’s White to move and reach a winning position in 101 moves.
Source: Gijs van Breukelen, Schakend Nederland, 1981, Special ...
17
votes
1answer
932 views
Son of the Revenge of the Riley Riddles in Reverse Strikes Again
Because why not, here's yet another bunch of these inverted riddles, where the solutions are what you'd usually use as the wordplay clues in a Riley Riddle. Here's how it goes:
You get three words.
...
5
votes
1answer
86 views
A Curve of Pursuit Yajilin
Following on from my previous Yajilin, I wanted to make a harder one for your entertainment and amusement, and hopefully to keep @Deusovi occupied for more than 20 minutes.
Rules (shamelessly ...
0
votes
1answer
67 views
TripTog's problem with his socks [closed]
Our friendly three-footed alien TripTog has two triplets of socks, which he keeps in a drawer in a room.
Each triplet of socks is labeled 1, 2 or 3, because TripTog is very meticulous about which ...
4
votes
1answer
116 views
“Short” And Sweet Math
In the following chess diagram, how many possible chess postions exist?
No looking at the solution!
Source: P1359129 & Andrew Jonathan Mestel,
Retros mailing list, 2/1/2019
6
votes
5answers
191 views
Chess Construction Challenge #3-The Inverse Babson
Another day, another task!
Today's challenge is to construct four positions, with White to move and win, such that:
In each position, White's move is to promote to a particular piece, for a position ...
7
votes
4answers
2k views
Smallest number containing the first 11 primes as sub-strings
113257 contains the first 6 primes as sub-strings when reading them from left to right:
2: 113257
3: 113257
5: 113257
7: 113257
11: 113257
13: 113257
What is the smallest number that contains ...
3
votes
2answers
155 views
Back in time, in my time, all the time
I present to you all a highly interesting problem that I came across awhile ago on Tim Krabbe’s site.
It’s White move and win, i.e. reach a winning positon, in 21 moves.
Source: David Gurgenidze &...
13
votes
1answer
857 views
Dear Fellow PSE Users,
This puzzle is dedicated to all of you!
Instructions
There are 8 anagram questions below.
In each question, you can rearrange the letters to find an answer, which is 2 English words that describe a ...
10
votes
2answers
657 views
The Google Earth Challenge: “A dangerous flower”
This puzzle is based on Where is it? - The Google Earth Challenge series started by Conifers
This puzzle will provide a screenshot in somewhere on Google Earth, please try your best to identify where ...
12
votes
2answers
196 views
Missing lattes and mutually mistrustful words
It's always amusing to watch two kids who don't trust each other swap baseball cards by exchanging them at exactly the same moment. Words can be equally mistrustful about trading their letters. ...
7
votes
2answers
312 views
Not Seven This Time - another Google Earth challenge
Where is this?
Please don't use Google reverse image search, but solve the puzzle using inspiration and deduction.
12
votes
1answer
247 views
Don't look back, crazy clown
Start with these two words
INSANE RETROSPECT
and see if you can get them to exchange places by transferring one letter at a time. With each ...
7
votes
1answer
145 views
Manually mixing words
Inspired by my struggles with this puzzle.
In that puzzle, I needed to mix two words, meaning blend them together without changing the order. For example, "ab" mixed with "cd" would give us 6 new ...
9
votes
1answer
469 views
Connect the wires without setting off the bomb
You just saw a planted time bomb! Just 5 minutes are remaining until it explodes and as you are in currently in a rural area (no bomb disposal squad) and you know how bombs usually work it is up to ...
4
votes
1answer
151 views
A Remote Location
Here be a simple problem
For the keen directmate eye
White to move and win
In seven moves, Black shall die
However, I remember now a relative
Long ago did he begin to live
About a two decades or ...
21
votes
1answer
695 views
The little bee buzzes around the flower garden
Watch the little bee buzz around the flower garden. Pay particular attention to how he picks up or drops off pollen (i.e., a single letter) at each flower.
Notice:
— The little bee visits each ...
8
votes
1answer
546 views
Winning the Lottery
Bob: I hear you won the lottery.
Alice: So I did!
Bob: What six numbers did you win it with?
Alice: Can't remember. All I recall is that they were all different, and none greater than 28.
Bob: ...
14
votes
2answers
965 views
The 7-numbers crossword
This crossword doesn't have any regular clues, however, all the words are made with the same 7 letters (each of them got a number). No automatic solvers are allowed.
CSV version:
...
7
votes
1answer
202 views
A Game of Sprouts
I have a partially played game of sprouts that I need help solving. The rules are simple (Kevin over at VSauce2 did a great job explaining it if you don't like reading, though the Yoda voice is a bit ...
2
votes
0answers
150 views
Around The World
It's White to move and checkmate Black in 36 moves. I have slightly changed the original stipulation. Feel free to explain the title if you want to!
Source(Couldn't copy and paste!):
(Oleg Pervakov ...
-1
votes
1answer
50 views
lightest ball among 8 balls by 2 tries using a balance scales [duplicate]
I have 8 balls and one of them is lighter than others. How could I find that ball by 2 tries? Also I have a balance scales.
3
votes
1answer
88 views
Alphametic puzzle, involving square and prime numbers [closed]
I have been trying puzzle solving recently and came across this problem.
Any hints on how to do this?
So far, I have found that N, R and F must be odd (as they are the last digit in a 5 digit prime ...
8
votes
3answers
385 views
So, what's to do?
It's White to move and draw the game. What must White do?
You must provide proof for your claim of what's to be done by any reasonable means.
This puzzle was created by Nikita M. Plaksin, and ...
4
votes
2answers
192 views
The Dropper, But With A Twist
Here's a piece-drop puzzle of my own.
In the below position, a White piece is to be dropped onto the board. This means that, before White can move, they must legally put a single piece on them board.
...
10
votes
1answer
443 views
100 Years of GCHQ - A quick afternoon puzzle!
I'm off to the Science Museum London tomorrow, to the Exhibition celebrating 100 years of GCHQ. As such, they sent me a little reminder email this afternoon.
On the bottom of the email was the ...
2
votes
1answer
151 views
That Ain't Right… #4
Here's a small head-scratcher for you all today.
In the above position, it is White to play and mate Black in four moves, assuming that Black plays their best moves.
However, there is a catch—there ...
6
votes
1answer
952 views
Dodgy Dies: The Puzzling Premiere
Inspired by the "Treasure Hunter Monolith" minigame from Danganronpa V3
Dodgy Dies Guide
Terminology
Block - a single die on the grid.
Cycle - a list of blocks
Value - the ...
5
votes
2answers
243 views
Tempoverlustspiel
Tempoverlustspiel-A German word that roughly translates to "loss of tempo game." An interesting chess term that I leaned a while ago
With White to move in the below position, how many moves will it ...
3
votes
1answer
103 views
A Breeze Through
Here's a small problem for you all to breeze through tonight!
It's White to move and selfmate themselves in 7 turns.
Can you tell me what the special concept is that arises from this problem?
As ...
7
votes
2answers
525 views
Don't bully your little sister at chess
This puzzle was inspired by @RewanDemontay's puzzle De-zephyr The Solution!. Rewan kindly granted me permission for making this puzzle and citing his as my source of inspiration. I thought of naming ...
6
votes
1answer
175 views
De-zephyr The Solution!
Here's another original chess problem of mine for you all to solve today!
In the following position, White wants to stalemate Black even though they can win, for unknown, unclear, unexplained, and ...
0
votes
1answer
102 views
coordinate encription
today I found myself in front of the following codified text:
MzIgVCA2NTg3MjYgNDg1MTY0Nw0KMzIgVCA2NTc5OTkgNDg1MzExMw0KMzIgVCA2NTc0MDUgNDg1MjMxM ...
15
votes
1answer
329 views
Newton's cradles
I went to one of those discovery stores and picked up a few Newton's cradles, except these have hanging words instead of hanging spheres.
Check it out:
This one has a starter pendulum with two ...
2
votes
1answer
179 views
The Sea Snake's Slithering Problem
Here's a really long chess puzzle, not made by me, that has the "sea snake" theme, which just basically means that it's super long.
It's White to move and checkmate Black in 122 moves.
Please do not ...
3
votes
2answers
231 views
Coin around shapes: A Geometric paradox?
Here is a circular coin with diameter D
Figure A
From its starting position the small coin goes completely around a
bigger circular body of diameter 4D without slipping, always in
contact ...
20
votes
1answer
1k views
Farmer needs to get his word across the river
In the spirit of the classic river-crossing puzzles:
...
8
votes
2answers
328 views
Square Spin #4: Rude Awakening
Square Spin History: #1>#2>#3>#4
New Rule
This puzzle introduces a new square type:
Lonely squares (Ly)
Lonely squares
This type of square contains a box and it is ...
4
votes
2answers
196 views
Chess Construction Challenge #1-Read First Please!
I'm starting a new series in which I set a very specific goal with a unique (to be more specifically defined here in a bit) answer in which the solver must construct a chess position, sometimes a game,...
2
votes
1answer
134 views
Oops! Mixed up Multiplication - Needs to be Fixed
$Given$:
$U$, $V$, $C$ are distinct digits, varying from 1 to 9.
$U$ > $V$ > $C$
$UVC$, $VCU$, $CUV$ are concatenated Numbers
$(UVC)*(VCU)*(CUV)$ = $234235286$
The digits on the right hand side ...
1
vote
5answers
259 views
How fast can you “DOCK” the “SHIP”? [closed]
You have to reach DOCK from SHIP in the minimum number of tries with the following rules.
You are only allowed to change one letter at a time.
You have to keep the word length the same.
At each step ...
5
votes
1answer
209 views
Square Spin #3: Hickory Dickory Dock
Square Spin History: #1>#2>#3
Recap of the Rules
Basic rules from #1
Ambiguity, Un and Re squares from #2
Problem #3: Hickory Dickory Dock
The mouse ran up the clock.
...but ...
2
votes
1answer
118 views
What is the Last Digit in the Result of the given Expression? [closed]
$Given$:
$ASC$ is a concatenated number with distinct digits.
$S$ is square of $A$, $C$ is cube of $A$
Deduce the last digit of the following Expression through Deductive Reasoning only:
$$\begin{...
1
vote
1answer
54 views
Pan Digital Split among Two Powers
$Given$:
$AB$, $DBCE$,$AGFPQR$ are three concatenated numbers with all distinct digits varying from zero to nine.
$AB^C$ = $DBCE$
$AB^F$ = $AGFPQR$
Deduce all the digits through logical reasoning ...
-4
votes
4answers
161 views
Go for the Gold
You are given a bag containing 1 and 2 ounce gold rounds.
You need to draw one coin at a time till they Sum up to ten rounds.
How many different ways you can achieve that?
What is the quickest path ...
1
vote
1answer
90 views
Express the given Fractions as Continued Fractions
Using only the numbers, $1$, $2$, $12$.
No concatenations allowed.
Only permitted signs are plus and division.
Brackets are not needed.
Expressions should be as concise as possible.
Typical ...
8
votes
1answer
278 views
3D Chess - Stale NBA (kNight-Bishop Assault)
This is my very first chess puzzle. Any constructive feedback is more than welcome. Thanks!
Introducing 3D Chess!
To make things simple for the first time, we are using a $3\times3\times3$ ...
3
votes
1answer
192 views
Holy Alphabet Arithmetic
$Given$:
$A$+$B$+$C$=3
$B$+$C$+$D$=3
$C$+$D$+$E$=1
$D$+$E$+$F$=1
What is
$E$+$F$+$G$=?
