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Chopped Chess Board and Dominoes?

Blogs > EsX_Raptor
Post a Reply
EsX_Raptor
Profile Blog Joined February 2008
United States2802 Posts
Last Edited: 2011-08-04 23:01:09
August 04 2011 22:05 GMT
#1
We have a chessboard with the two opposing corners removed, and we have a set of dominoes shaped such that each domino covers exactly two squares:

[image loading]


Which arrangement of dominoes can cover the entire chessboard?

+ Show Spoiler [Solution] +
aphorism is right.

Damn you, Teamliquid! I was expecting a solution at least by the third response or so!


***
aphorism
Profile Joined February 2011
United States226 Posts
August 04 2011 22:09 GMT
#2
Solution:

+ Show Spoiler +
None: each domino must cover one white square and one black one, but the modified board has 32 black squares and only 30 white ones, so no arrangement works.
Mikilatov
Profile Blog Joined May 2008
United States3897 Posts
Last Edited: 2011-08-04 22:13:50
August 04 2011 22:13 GMT
#3
On August 05 2011 07:09 aphorism wrote:
Solution:

+ Show Spoiler +
None: each domino must cover one white square and one black one, but the modified board has 32 black squares and only 30 white ones, so no arrangement works.


+ Show Spoiler +
I tried it like 3-4 times and failed. =P If it is indeed unsolvable as you say, then I hate you, OP.
♥ I used to lasso the shit out of your tournaments =( ♥ | Much is my hero. | zizi yO~ | Be Nice, TL.
XXGeneration
Profile Blog Joined November 2010
United States625 Posts
August 04 2011 22:14 GMT
#4
On August 05 2011 07:09 aphorism wrote:
Solution:

+ Show Spoiler +
None: each domino must cover one white square and one black one, but the modified board has 32 black squares and only 30 white ones, so no arrangement works.


+ Show Spoiler +
This is correct; I remember this as being the proper explanation for these types of problems.
"I was so surprised when I first played StarCraft 2. I couldn't believe that such an easy game exists... I guess the best way to attract people these days is to make things easy and simple." -Midas
Primadog
Profile Blog Joined April 2010
United States4411 Posts
August 04 2011 22:37 GMT
#5
Elegent. What a beautiful solution.
Thank God and gunrun.
GigaFlop
Profile Blog Joined October 2010
United States1146 Posts
August 04 2011 23:37 GMT
#6
I thought this was going to be an actual chopped up chessboard with dominoes replacing the missing squares... But nope, not that.
(╯°□°)╯︵ ┻━┻ "Shift-Q oftentimes makes a capital Q" - Day[9] || iNcontrol - Alligator from heaven = ^
Monoxide
Profile Blog Joined January 2007
Canada1190 Posts
August 05 2011 00:08 GMT
#7
Pretty well known problem. Indeed the solution is very elegant.
infinitestory
Profile Blog Joined April 2010
United States4053 Posts
August 05 2011 00:10 GMT
#8
Now, a second question - what arrangement of L-shaped triominoes can cover every square????

+ Show Spoiler +
heh
Translator:3
Z3kk
Profile Blog Joined December 2009
4099 Posts
August 05 2011 00:11 GMT
#9
Nailed the solution. Nice.
Failure is not falling down over and over again. Failure is refusing to get back up.
3FFA
Profile Blog Joined February 2010
United States3931 Posts
August 05 2011 03:58 GMT
#10
On August 05 2011 07:05 EsX_Raptor wrote:
We have a chessboard with the two opposing corners removed, and we have a set of dominoes shaped such that each domino covers exactly two squares:

[image loading]


Which arrangement of dominoes can cover the entire chessboard?

+ Show Spoiler [Solution] +
aphorism is right.

Damn you, Teamliquid! I was expecting a solution at least by the third response or so!

Lol... This place is full of nerds, geeks, other smart dudes, chess lovers, puzzle solving lovers, etc. And you expected for this to work? :3
"As long as it comes from a pure place and from a honest place, you know, you can write whatever you want."
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