From Edward Winter's Chess Notes (4141):
The harmlessness of chess was a theme taken up again by Lord Dunsany the following year in what is perhaps the finest chess poem ever written in English. It marked the death of R.H.S. Stevenson and was published on page 74 of the April 1943 BCM:
One art they say is of no use;
The mellow evenings spent at chess,
The thrill, the triumph, and the truce
To every care, are valueless.
And yet, if all whose hopes were set
On harming man played chess instead,
We should have cities standing yet
Which now are dust upon the dead.
I couldn't agree more. And I encourage you to visit the rest of Winter's superb site, the finest chess history archive on the web