110 competition/games/chess/queen.control.p
Description
This article is from the Puzzles FAQ, by Chris Cole chris@questrel.questrel.com and Matthew Daly mwdaly@pobox.com with numerous contributions by others.
110 competition/games/chess/queen.control.p
How many queens does it take to attack or control the board?
competition/games/chess/queen.control.s
Five queens are required to attack every square:
1 2 3 4 5 6 7 8
___ ___ ___ ___ ___ ___ ___ ___
h | | | | | | | | |
--- --- --- --- --- --- --- ---
g | | | | Q | | | | |
--- --- --- --- --- --- --- ---
f | | | | Q | | | | |
--- --- --- --- --- --- --- ---
e | | | | Q | | | | |
--- --- --- --- --- --- --- ---
d | | | | Q | | | | |
--- --- --- --- --- --- --- ---
c | | | | | | | | |
--- --- --- --- --- --- --- ---
b | | | | | | | | |
--- --- --- --- --- --- --- ---
a | | | | Q | | | | |
--- --- --- --- --- --- --- ---
There are other positions with five queens.
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