Like this 

print for map{ join '|', map sprintf( "%02d", $_ ), $_*8+1 .. $_*8+8 }
+ 0 .. 7;;
01|02|03|04|05|06|07|08
09|10|11|12|13|14|15|16
17|18|19|20|21|22|23|24
25|26|27|28|29|30|31|32
33|34|35|36|37|38|39|40
41|42|43|44|45|46|47|48
49|50|51|52|53|54|55|56
57|58|59|60|61|62|63|64

[download]

Or perhaps this comes closer to your "one loop" ideal?:

print for  unpack '(A24)*', join'|','01' .. '64', '';;
01|02|03|04|05|06|07|08|
09|10|11|12|13|14|15|16|
17|18|19|20|21|22|23|24|
25|26|27|28|29|30|31|32|
33|34|35|36|37|38|39|40|
41|42|43|44|45|46|47|48|
49|50|51|52|53|54|55|56|
57|58|59|60|61|62|63|64|

[download]
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In reply to Re: Chess Board Single Loop by BrowserUk
in thread Chess Board Single Loop by xantithor

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