Go capture by chez

m[21][21],i,j,c,b;\x0d
main(r){while(scanf("%c%d%*c",&b,&r)>0){c=b-64;if(c>8)c--;m[c][r]=1;}for(i=1;i<20;i++)for(j=1;j<20;j++){if(m[i][j])continue;if(m[i-1][j]|m[i][j-1]|m[i+1][j]|m[i][j+1]){printf("%c%d\n",((i>8)?i:i-1)+65,j);}}}\x0d

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

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