June 2018 - Challenge

<< May


There are two L-shaped one-sided tetrominoes - tetrominoes that can be translated and rotated but not flipped:

	 X
	 X
	XX
and
	X
	X
	XX

Known as "J" and "L", respectively. The following shape can be created both from three "L"s and from three "J"s (how?):

This shape is symmetrical (using the drawn top-left to bottom-right diagonal as an axis) and has a hole inside.
This month's challenge is to find an asymmetrical shape without holes that can be constructed both from five "L"s and from five "J"s.




We will post the names of those who submit a correct, original solution! If you don't want your name posted then please include such a statement in your submission!

We invite visitors to our website to submit an elegant solution. Send your submission to the ponder@il.ibm.com.

If you have any problems you think we might enjoy, please send them in. All replies should be sent to: ponder@il.ibm.com

Challenge: 28/05/2018 @ 12:00 PM EST
Solution: 02/07/2018 @ 12:00 PM EST
List Updated: 18/06/2018 @ 12:00 PM EST

People who answered correctly:

Nir Lavee & Omer Shechter (28/05/18 04:18 PM IDT)
Daniel Chong Jyh Tar (28/05/18 05:45 PM IDT)
Guillaume Escamocher (28/05/18 06:46 PM IDT)
Kang Jin Cho (28/05/18 07:10 PM IDT)
Alexander Raß (28/05/18 07:30 PM IDT)
David F.H. Dunkley (28/05/18 08:13 PM IDT)
Paolo Farinelli (28/05/18 10:04 PM IDT)
Susan Brommer (28/05/18 10:20 PM IDT)
Bert Dobbelaere (28/05/18 10:44 PM IDT)
Oleg Vlasii (28/05/18 11:08 PM IDT)
Dominik Reichl (29/05/18 12:33 AM IDT)
Alper Halbutogullari (29/05/18 05:20 AM IDT)
Kaifei Chen (29/05/18 07:34 AM IDT)
Steven Langerwerf (29/05/18 07:37 AM IDT)
Harald Bögeholz (29/05/18 11:15 AM IDT)
Alex Fleischer (29/05/18 07:47 PM IDT)
Anna Wegloop (29/05/18 09:07 PM IDT)
Franciraldo Cavalcante (30/05/18 12:14 AM IDT)
Eden Saig (30/05/18 12:27 AM IDT)
Francis Golding (30/05/18 01:05 AM IDT)
Reiner Martin (30/05/18 01:05 AM IDT)
Andreas Stiller (30/05/18 01:14 AM IDT)
Oleg Selin (30/05/18 11:31 AM IDT)
Mathias Schenker (30/05/18 06:34 PM IDT)
Clive Tong (30/05/18 06:55 PM IDT)
Zohar Bengad (30/05/18 11:45 PM IDT)
Jesse Rearick (31/05/18 02:31 AM IDT)
Oscar Volpatti (31/05/18 02:55 AM IDT)
Li Li (31/05/18 05:55 AM IDT)
Aviv Nisgav (31/05/18 11:08 AM IDT)
Lauren Paulson (31/05/18 02:58 PM IDT)
Vladimir Volevich (31/05/18 04:33 PM IDT)
Rickard Björklund (31/05/18 07:25 PM IDT)
Tom Sirgedas (31/05/18 10:19 PM IDT)
Todd Will (01/06/18 01:01 AM IDT)
Tyler Mullen (01/06/18 08:35 AM IDT)
Ma Hongqiang & Alistair Ong Nai Hian & Eric Loh (01/06/18 11:10 AM IDT)
Robert Lang (01/06/18 03:41 PM IDT)
David Friedman (01/06/18 06:33 PM IDT)
Florian Fischer (02/06/18 01:33 PM IDT)
Andreas Eisele (02/06/18 12:20 PM IDT)
Rashid Naimi (02/06/18 05:39 AM IDT)
Rudy Cortembert (02/06/18 05:05 PM IDT)
Arthur Vause (02/06/18 05:23 PM IDT)
Andrei Tsygankov (02/06/18 10:09 PM IDT)
Almog Yair (03/06/18 12:51 PM IDT)
Bradley Alexander (03/06/18 06:44 PM IDT)
Lorenz Reichel (03/06/18 07:31 PM IDT)
Shirish Chinchalkar (04/06/18 04:26 AM IDT)
Davin Choo (04/06/18 05:16 AM IDT)
Oskar Neda (04/06/18 11:43 AM IDT)
Graham Hemsley (04/06/18 06:50 PM IDT)
Joaquim Neves Carrapa (04/06/18 10:17 PM IDT)
Evert van Dijken (04/06/18 11:12 PM IDT)
Victor Chang (05/06/18 07:13 AM IDT)
Walter Sebastian Gisler (05/06/18 09:14 AM IDT)
Dieter Beckerle (05/06/18 01:55 PM IDT)
Mykola Zubach (05/06/18 06:36 PM IDT)
Susanne Wienand (05/06/18 08:21 PM IDT)
David Greer (06/06/18 01:27 AM IDT)
Clay Pearson (06/06/18 04:37 PM IDT)
Vladimir M. Milovanović (06/06/18 06:26 PM IDT)
Seancarlos Gonzalez (07/06/18 12:51 AM IDT)
Frank Schoeps (07/06/18 04:33 PM IDT)
Paul Shaw (07/06/18 06:42 PM IDT)
Harrison Klein (07/06/18 10:42 PM IDT)
Nikita Sivukhin (11/06/18 12:03 AM IDT)
JJ Rabeyrin (11/06/18 12:46 AM IDT)
Nyles Heise (11/06/18 08:12 AM IDT)
Kevin Esmeray (11/06/18 04:13 PM IDT)
Yue Ru Sun (11/06/18 11:20 PM IDT)
Vojtech Havlicek (12/06/18 02:15 AM IDT)
Muralidhar Seshadri (12/06/18 07:13 AM IDT)
Francisco Couzo (12/06/18 09:14 AM IDT)
Daren Khu (12/06/18 11:05 AM IDT)
Andreas Knüpfer (12/06/18 11:00 PM IDT)
Vivek Nema (13/06/18 05:15 PM IDT)
Daniel Bitin (14/06/18 12:20 PM IDT)
Joseph DeVincentis (14/06/18 09:22 PM IDT)
Hal Mutlu (16/06/18 01:23 AM IDT)
Pieter Vandercammen (16/06/18 01:49 PM IDT)