Logic Puzzles

119. 8 Queens

Place 8 queens on a chess board so that no queen can kill another in a single move.

Submitted by ozzy10000 · Added 14 August 2009

Solution:

One possible solution is to place the queens at the following coordinates: (1, 5), (2, 3), (3, 1), (4, 7), (5, 2), (6, 8), (7, 4), and (8, 6). This arrangement ensures that no two queens threaten each other, as they are positioned such that no two queens share the same row, column, or diagonal.

Another valid arrangement is:

B B B B B B B Q
B B B Q B B B B
Q B B B B B B B
B B Q B B B B B
B B B B B Q B B
B Q B B B B B B
B B B B B B Q B
B B B B Q B B B


Comments (5)

ozzy10000 14 August 2009

in case you didnt already know, a chess board is 8x8

Callyst 14 August 2009

i think this is right, correct me if im wrong

B= blank
Q= queen

in case the letters were'nt easily understood

BQBBBBBB
BBBQBBBB
BBBBBQBB
BBBBBBBQ
BBQBBBBB
QBBBBBBB
BBBBBBQB
BBBBQBBB

chocorules10 7 February 2010

That's not quite possible, as queens can go diagonally too.

Callyst 5 March 2010

they don't hit any other queens diagonally, try it

B Q B B B B B B
B B B Q B B B B
B B B B B Q B B
B B B B B B B Q
B B Q B B B B B
Q B B B B B B B
B B B B B B Q B
B B B B Q B B B

(hope this helps)

ichiro tetsuya 1 December 2015

B B B B B B B Q
B B B Q B B B B
Q B B B B B B B
B B Q B B B B B
B B B B B Q B B
B Q B B B B B B
B B B B B B Q B
B B B B Q B B B

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