The example in the article with cat, grep and awk:

    cat *.pgn | \
    grep "Result" | \
    awk '
     {
        split($0, a, "-");
        res = substr(a[1], length(a[1]), 1);
        if (res == 1) white++;
        if (res == 0) black++;
        if (res == 2) draw++;
      }
      END { print white+black+draw, white, black, draw }
    '

Can be written much more succinctly with just awk, and you don't even need to split the string or use substr:

    awk '
      /Result/ {
        if (/1\/2/) draw++;
        else if (/1-0/) white++;
        else if (/0-1/) black++;
      }
      END { print white+black+draw, white, black, draw }
    ' *.pgn