Go capture by nuko

for(<>){/\d+/;$g[ord][$&]|=1;$_|=2for$g[ord][$&+1],$g[ord][$&-1],$g[ord()-1][$&],$g[1+ord][$&]}for$r(A..H,J..T){$g[ord$r][$_]-2||print$r,$_,$/for 1..19}

Note that non-ascii characters in the above source code will be escaped (such as \x9f).

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