Here is scenario in which Doosan makes the postseason with 8 additional wins (64 total).

Here are the final standings in the scenario:
            Team	W	L	D	PCT	GB
              LG	89	52	3	0.6312	0.0
          Hanwha	86	54	4	0.6143	2.5
             SSG	74	64	6	0.5362	13.5
         Samsung	74	68	2	0.5211	15.5
          Doosan	64	72	8	0.4706	22.5
             KIA	65	74	5	0.4676	23.0
              NC	64	73	7	0.4672	23.0
              KT	65	75	4	0.4643	23.5
           Lotte	64	74	6	0.4638	23.5
          Kiwoom	50	89	5	0.3597	38.0

To construct the scenario, we start with the current standings:
            Team	W	L	D	GL	PCT	GB
              LG	80	49	3	12	0.620	0.0
          Hanwha	76	53	3	12	0.589	4.0
             SSG	65	60	4	15	0.520	13.0
              KT	65	63	4	12	0.508	14.5
         Samsung	66	64	2	12	0.508	14.5
           Lotte	63	64	6	11	0.496	16.0
              NC	61	62	6	15	0.496	16.0
             KIA	61	65	4	14	0.484	17.5
          Doosan	56	70	6	12	0.444	22.5
          Kiwoom	43	86	4	11	0.333	37.0

The next two tables show, respectively, how many of their remaining games each team wins and ties against each of the other teams in the scenario:

					Scenario Additional Wins Against
Team	Doosan	Hanwha	KIA	Kiwoom	KT	LG	Lotte	NC	Samsung	SSG	Wins
Doosan	-	1	0	3	0	0	1	1	0	2	8
Hanwha	0	-	3	0	2	3	1	0	0	1	10
KIA	0	0	-	0	1	0	1	2	0	0	4
Kiwoom	0	0	1	-	1	0	1	1	2	1	7
KT	0	0	0	0	-	0	0	0	0	0	0
LG	1	0	0	0	4	-	1	2	1	0	9
Lotte	0	0	0	0	0	0	-	1	0	0	1
NC	0	0	1	0	1	0	1	-	0	0	3
Samsung	1	0	2	0	1	0	3	1	-	0	8
SSG	0	0	2	0	2	0	1	3	1	-	9
-----------------------------------------------------------------------------------
Losses	2	1	9	3	12	3	10	11	4	4

					Scenario Additional Draws (Ties) With
Team	Doosan	Hanwha	KIA	Kiwoom	KT	LG	Lotte	NC	Samsung	SSG	Total
Doosan	-	1	0	0	0	0	1	2	0	2	2
Hanwha	0	-	0	1	0	1	0	0	0	0	1
KIA	0	0	-	2	0	0	0	1	0	1	1
Kiwoom	0	1	0	-	0	0	0	1	0	1	1
KT	0	0	0	0	-	0	0	1	0	0	0
LG	0	0	0	0	0	-	2	0	0	0	0
Lotte	0	0	0	0	0	0	-	0	1	0	0
NC	0	0	1	0	0	0	0	-	0	1	1
Samsung	0	0	0	0	0	0	0	0	-	1	0
SSG	2	0	0	0	0	0	0	0	0	-	2
-----------------------------------------------------------------------------------
Total	2	1	1	1	0	0	0	1	0	2

The next two tables show, respectively, how many total games each team wins and ties against each of the other teams in the scenario:

					Scenario Total Wins Against
Team	Doosan	Hanwha	KIA	Kiwoom	KT	LG	Lotte	NC	Samsung	SSG	Wins
Doosan	-	9	6	12	4	6	8	6	6	7	64
Hanwha	6	-	12	13	11	8	10	9	8	9	86
KIA	9	4	-	7	9	5	9	8	7	7	65
Kiwoom	4	2	7	-	6	7	5	6	6	7	50
KT	11	5	7	10	-	4	6	6	10	6	65
LG	10	7	11	9	12	-	10	10	10	10	89
Lotte	7	6	7	11	8	4	-	8	7	6	64
NC	8	6	7	9	9	6	8	-	7	4	64
Samsung	10	8	9	10	6	6	8	9	-	8	74
SSG	7	7	8	8	10	6	10	11	7	-	74
-----------------------------------------------------------------------------------
Losses	72	54	74	89	75	52	74	73	68	64

					Scenario Total Draws (Ties) With
Team	Doosan	Hanwha	KIA	Kiwoom	KT	LG	Lotte	NC	Samsung	SSG	Total
Doosan	-	1	1	0	1	0	1	2	0	2	8
Hanwha	0	-	0	1	0	1	0	1	0	0	4
KIA	0	0	-	2	0	0	0	1	0	1	5
Kiwoom	0	1	0	-	0	0	0	1	0	1	5
KT	0	0	0	0	-	0	2	1	0	0	4
LG	0	0	0	0	0	-	2	0	0	0	3
Lotte	0	0	0	0	0	0	-	0	1	0	6
NC	0	0	1	0	0	0	0	-	0	1	7
Samsung	0	0	0	0	0	0	0	0	-	1	2
SSG	2	0	0	0	0	0	0	0	0	-	6
-----------------------------------------------------------------------------------
Total	8	4	5	5	4	3	6	7	2	6

# Doosan Bears magic number
# Doosan's magic number
# Bears magic number
# KBO Playoff Race