Someone

SELECT mapdef.uniqueid AS mapname,

SUM((
  ABS(
   mapdata.ctwon / (mapdata.ctwon + mapdata.terroristwon) - (mapdata.terroristwon / (mapdata.ctwon + mapdata.terroristwon))
  )
  *
  IF
  (
   mapdata.ctwon / (mapdata.ctwon + mapdata.terroristwon) > mapdata.terroristwon / (mapdata.ctwon + mapdata.terroristwon),
   (stats.terroristwon + stats.terroristlost) / ( stats.ctwon + stats.ctlost + stats.terroristwon + stats.terroristlost ) -
   (stats.ctwon + stats.ctlost) / ( stats.ctwon + stats.ctlost + stats.terroristwon + stats.terroristlost ),
   (stats.ctwon + stats.ctlost) / ( stats.ctwon + stats.ctlost + stats.terroristwon + stats.terroristlost ) -
   (stats.terroristwon + stats.terroristlost) / ( stats.ctwon + stats.ctlost + stats.terroristwon + stats.terroristlost )
  )
)
*
(
  SELECT weight FROM (
   SELECT
   @avg:=
   (
    SELECT AVG(ctwon + ctlost + terroristwon + terroristlost) AS avg
    FROM ps_c_plr_maps
    WHERE plrid = 6
    AND lastdate > DATE_SUB(NOW(), INTERVAL 14 DAY)
   ),
   mapid,

   CASE
    WHEN ((ctwon + ctlost + terroristwon + terroristlost) >= (@avg))
     THEN 1
    ELSE
     (ctwon + ctlost + terroristwon + terroristlost) / (@avg)
   END AS weight

   FROM ps_c_plr_maps
   WHERE plrid = 6
  ) AS weight
  WHERE weight.mapid = stats.mapid
)) AS teamratio

FROM

ps_c_plr_maps AS stats,
ps_c_map_data AS mapdata,
ps_map AS mapdef
WHERE
  (stats.ctwon + stats.ctlost + stats.terroristwon + stats.terroristlost > 0) AND
  stats.plrid = 6 AND
  stats.mapid = mapdef.mapid AND
  mapdef.mapid IN
  (
   SELECT DISTINCT mapid
   FROM ps_c_plr_maps
   WHERE lastdate > DATE_SUB(NOW(), INTERVAL 14 DAY)
   AND plrid = 6
  ) AND
  mapdata.mapid = mapdef.mapid
  GROUP BY stats.plrid,mapdef.mapid

ORDER BY teamratio




+-------------------+-----------------+
| mapname           | teamratio       |
+-------------------+-----------------+
| de_nightfever     | -0.047217959062 |
| de_tides          | -0.011967652109 |
| de_train          |  0.000322773619 |
| de_dust2          |  0.000356559951 |
| de_nuke           |  0.001638071506 |
| de_cbble          |  0.002155278530 |
| de_losttemple_pro |  0.003046205440 |
| de_inferno        |  0.003815144037 |
| de_chateau        |  0.005592974531 |
| de_prodigy        |  0.011873021055 |
| de_piranesi       |  0.017991999965 |
| cs_italy          |  0.033892078123 |
+-------------------+-----------------+
12 rows in set (0.19 sec)