This Rating takes into account only the matches played in the 1970s. Brief explanation of the ratings is given before each section (Detailed Explanation) and at the end. So, here are the Top 7 Spin bowlers in Test Cricket in the 1970s.

CONTENTS

3. PRIMARY CRITERIA

3.1. PROLIFIC

3.2. CONSISTENT

3.2.1. Against All Teams

3.2.2. Against Top Teams

3.3. ATTACKING

3.3.1. Against All Teams

3.3.2. Against Top Teams

3.4. BEST BOWLING (WKTS)

3.4.1. Against All Teams

3.4.2. Against Top Teams

3.5. PRIMARY RATING

4. CONDITIONS CRITERIA

4.1. HOME/AWAY

4.1.1. At Home

4.1.2. Away From Home

4.2. FAVOURABLE/UNFAVOURABLE CONDITIONS

4.2.1. Favourable Conditions Rating

4.2.1.1. Non Asians In Asia

4.2.1.2. Asians In Asia

4.2.2. Unfavourable Conditions Rating

4.2.2.1. Non Asians Outside Asia

4.2.2.2. Asians Outside Asia

4.3. CONDITIONS RATING

5. SECONDARY CRITERIA

5.1. WKTS/INN

5.2. TOP FORM

5.3. IMPACT INNINGS

5.4. SECONDARY RATING

6. DECADES RATING

6.1. BRIEF EXPLANATION

6.1.1. Dynamic Nature

6.1.2. Trend Setter (TS)

6.1.3. Top Teams (TT)

6.1.4. Abbreviations

THE CRITERIA

CRITERIA	CONSTITUENTS
Primary	Wickets, Average, Strike Rate, Top Inns
Conditions	Home, Away, In Asia, Outside Asia
Secondary	Wkts Per Inn, Top Form, Impact Inns

QUALIFICATION

Min Innings (TT)	20
Min Wkts	30

PRIMARY CRITERIA

CRITERIA	STAT	POINTS
Prolific	Wickets Taken	250.00
Consistent	Average	300.00
Attacking	Strike Rate	300.00
Best Bowling	Top Bowling Performances	150.00

PROLIFIC

Criteria: Points For Wickets Taken

RANK	BOWLER	NAT	INNS	WKTS	RAT
TS	DL Underwood	ENG	106	202	250.00
1	DL Underwood	ENG	106	202	250.00
2	BS Bedi	IND	84	196	242.57
3	BS Chandrasekhar	IND	70	180	222.77
4	LR Gibbs	WI	56	100	123.76
5	AA Mallett	AUS	51	91	112.62
6	Mushtaq Mohammad	PAK	51	65	80.45
7	JD Higgs	AUS	26	51	63.12

CONSISTENT

R Ave

Relative Average (R Ave) is a more accurate type of average. Know How It Is Calculated. Briefly it takes into account:-

Strength of Opposition.
Venues at which a player has played.
Time Period in which a bowler has been active

Criteria: Points For Relative Average

Min Qualification For TS
Min Wickets	50
Min Wickets (TT)	40

Against All Teams

RANK	BOWLER	INNS	RUNS	WKTS	AVE	R AVE	RAT
TS	DL Underwood	106	5587	202	27.66	28.01	120.00
1	DL Underwood	106	5587	202	27.66	28.01	120.00
2	BS Bedi	84	5839	196	29.79	28.32	118.71
3	AA Mallett	51	2709	91	29.77	28.38	118.43
4	BS Chandrasekhar	70	5257	180	29.21	28.79	116.77
5	Mushtaq Mohammad	51	1893	65	29.12	29.13	115.42
6	JD Higgs	26	1676	51	32.86	30.36	110.74
7	LR Gibbs	56	3232	100	32.32	32.84	102.37

Against Top Teams

RANK	BOWLER	INNS	RUNS	WKTS	AVE	R AVE	RAT
TS	AA Mallett	36	1893	59	32.08	28.48	180.00
1	AA Mallett	36	1893	59	32.08	28.48	180.00
2	BS Chandrasekhar	54	3916	131	29.89	28.51	179.85
3	DL Underwood	63	3406	109	31.25	29.65	172.92
4	BS Bedi	70	4971	152	32.70	30.31	169.14
5	JD Higgs	26	1676	51	32.86	30.36	168.90
6	LR Gibbs	38	2301	69	33.35	30.94	165.74
7	Mushtaq Mohammad	38	1446	42	34.43	31.61	162.20

ATTACKING

R SR

Relative Strike Rate (R SR) for bowlers is calculated using the same method as R Ave with average being replaced with SR.

Criteria: Points For R SR or Balls/Wkt

Min Qualification For TS
Min Wickets	50
Min Wickets (TT)	40

Against All Teams

RANK	BOWLER	INNS	BLS	WKTS	SR	R SR	RAT
TS	BS Chandrasekhar	70	11212	180	62.29	56.44	120.00
1	BS Chandrasekhar	70	11212	180	62.29	56.44	120.00
2	Mushtaq Mohammad	51	4285	65	65.92	58.87	115.04
3	AA Mallett	51	6834	91	75.10	63.10	107.33
4	JD Higgs	26	3983	51	78.10	65.94	102.70
5	DL Underwood	106	15380	202	76.14	68.07	99.48
6	BS Bedi	84	15824	196	80.73	71.61	94.58
7	LR Gibbs	56	9886	100	98.86	86.07	78.68

Against Top Teams

RANK	BOWLER	INNS	BLS	WKTS	SR	R SR	RAT
TS	BS Chandrasekhar	54	8270	131	63.13	56.57	180.00
1	BS Chandrasekhar	54	8270	131	63.13	56.57	180.00
2	Mushtaq Mohammad	38	3117	42	74.21	62.60	162.66
3	AA Mallett	36	4641	59	78.66	63.62	160.06
4	JD Higgs	26	3983	51	78.10	65.94	154.42
5	DL Underwood	63	9025	109	82.80	71.18	143.06
6	BS Bedi	70	12920	152	85.00	74.75	136.22
7	LR Gibbs	38	6830	69	98.99	80.88	125.89

BEST BOWLING (WKTS)

BBW

In this criteria, we have taken the top 7 bowling performances by Wkts of a bowler. Best Bowling By Wickets (BBW) is simply the total wickets taken in the 7 innings divided by 7.

Criteria: Points For Wkts Taken In Top 7 Inns

Against All Teams

RANK	BOWLER	1	2	3	4	5	6	7	BBW	RAT
TS	BS Chandrasekhar	8/79	6/38	6/52	6/52	6/76	6/90	6/94	6.29	50.00
1	BS Chandrasekhar	8/79	6/38	6/52	6/52	6/76	6/90	6/94	6.29	50.00
1	DL Underwood	8/51	7/113	6/12	6/45	6/66	6/85	5/20	6.29	50.00
3	LR Gibbs	7/98	6/76	6/108	5/102	5/102	4/66	4/85	5.29	42.05
3	BS Bedi	6/71	6/226	5/27	5/48	5/55	5/63	5/82	5.29	42.05
5	AA Mallett	8/59	5/114	5/126	4/21	4/22	4/40	4/60	4.86	38.64
6	Mushtaq Mohammad	5/28	5/49	5/59	4/50	4/55	4/58	4/60	4.43	35.23
7	JD Higgs	7/143	5/148	4/69	4/91	3/42	3/53	3/67	4.14	32.95

Against Top Teams

RANK	BOWLER	1	2	3	4	5	6	7	BBW	RAT
TS	BS Chandrasekhar	8/79	6/38	6/52	6/52	6/76	6/90	5/50	6.14	100.00
1	BS Chandrasekhar	8/79	6/38	6/52	6/52	6/76	6/90	5/50	6.14	100.00
2	BS Bedi	6/71	6/226	5/55	5/63	5/89	5/105	5/110	5.29	86.05
3	DL Underwood	7/113	6/45	6/66	5/39	4/37	4/66	4/82	5.14	83.72
4	LR Gibbs	6/108	5/102	5/102	4/66	4/85	3/26	3/61	4.29	69.77
5	JD Higgs	7/143	5/148	4/69	4/91	3/42	3/53	3/67	4.14	67.44
6	AA Mallett	5/114	5/126	4/21	4/40	4/60	3/14	3/50	4.00	65.12
7	Mushtaq Mohammad	5/28	4/50	4/55	4/58	4/93	3/21	3/67	3.86	62.79

PRIMARY RATING

The total of the above four criteria comes out to be 1,000.00 points. The Primary Rating is the addition of the points a bowler scored in the four criteria. The Weightage of the Rating is 40%.

RANK	BOWLER	PRO	CON	ATT	BBW	RAT	PRI PTS
1	BS Chandrasekhar	222.77	296.62	120.00	150.00	969.39	387.76
2	DL Underwood	250.00	292.92	99.48	133.72	919.19	367.67
3	BS Bedi	242.57	287.84	94.58	128.09	889.31	355.72
4	AA Mallett	112.62	298.43	107.33	103.75	782.20	312.88
5	Mushtaq Mohammad	80.45	277.62	115.04	98.02	733.78	293.51
6	LR Gibbs	123.76	268.11	78.68	111.81	708.26	283.30
7	JD Higgs	63.12	279.64	102.70	100.40	700.28	280.11

CONDITIONS CRITERIA

The Conditions

The Conditions Ratings are calculated by applying the four criteria of the Primary Rating to diffirent conditions. If Innings are less than the Qualification than the Player gets 50% of the Points.

The four conditions criteria and thier weightage is as follows:-

CRITERIA	POINTS
Home	30.00
Away	120.00
Favourable Conditions	30.00
Unfavourable Conditions	120.00

HOME/AWAY

HM/AW RATING

Points to note:-

U.A.E. is considered as a second Home for Pakistan and Afghanistan.
All Home and Away stats of Pakistani and Afghani bowlers are calculated accordingly.

At Home

Min Innings Vs Top Teams: 7

RANK	BOWLER	INNS	WKTS	AVE	SR	RAT	WTG
1	BS Chandrasekhar	36	97	26.80	60.10	976.21	29.29
2	BS Bedi	36	94	24.67	75.79	875.01	26.25
3	DL Underwood	49	85	29.21	76.59	843.83	25.31
4	AA Mallett	33	57	28.44	72.37	835.29	25.06
5	LR Gibbs	25	47	35.94	105.06	689.35	20.68
6	JD Higgs	11	22	26.82	81.00	683.33	20.50
7	Mushtaq Mohammad	18	23	31.96	71.91	648.06	19.44

Away From Home

Min Innings Vs Top Teams: 7

RANK	BOWLER	INNS	WKTS	AVE	SR	RAT	WTG
1	DL Underwood	57	117	26.53	75.81	889.89	106.79
2	BS Chandrasekhar	34	83	32.01	64.84	865.36	103.84
3	BS Bedi	48	102	34.51	85.29	810.56	97.27
4	Mushtaq Mohammad	33	42	27.57	62.64	711.88	85.43
5	JD Higgs	15	29	37.45	75.90	647.00	77.64
6	AA Mallett	18	34	32.00	79.68	634.54	76.14
7	LR Gibbs	31	53	29.11	93.36	628.91	75.47

FAVOURABLE/UNFAVOURABLE CONDITIONS

Favourable/Unfavourable Conditions Rating

Points to note:-

Unfavourable Conditions (UC) is Outside Asia for Spinners and In Asia for Pacers.
Favourable Conditions (FC) are the opposite.

Favourable Conditions Rating

Non Asians In Asia

Min Innings Vs All Teams: 5

RANK	BOWLER	INNS	WKTS	AVE	SR	RAT	WTG
1	DL Underwood	21	47	25.13	71.94	1,000.00	30.00
2	LR Gibbs	14	28	23.71	81.29	832.64	24.98
3	JD Higgs	8	14	50.14	97.50	600.49	18.01
4	AA Mallett	0	0	NA	NA	500.00	15.00

Asians In Asia

Min Innings Vs Top Teams: 10

RANK	BOWLER	INNS	WKTS	AVE	SR	RAT	WTG
1	BS Chandrasekhar	40	105	28.43	61.01	973.04	29.19
2	BS Bedi	42	100	27.68	79.52	849.35	25.48
3	Mushtaq Mohammad	18	23	31.96	71.91	633.36	19.00

Unfavourable Conditions Rating

Non Asians Outside Asia

Min Innings Vs Top Teams: 10

RANK	BOWLER	INNS	WKTS	AVE	SR	RAT	WTG
1	DL Underwood	85	155	28.43	77.41	886.48	106.38
2	AA Mallett	51	91	29.77	75.10	778.33	93.40
3	JD Higgs	18	37	26.32	70.76	727.32	87.28
4	LR Gibbs	42	72	35.67	105.69	653.23	78.39

Asians Outside Asia

Min Innings Vs All Teams: 5

RANK	BOWLER	INNS	WKTS	AVE	SR	RAT	WTG
1	BS Chandrasekhar	30	75	30.29	64.08	912.94	109.55
2	BS Bedi	42	96	31.99	82.00	900.38	108.05
3	Mushtaq Mohammad	33	42	27.57	62.64	784.58	94.15

CONDITIONS RATING

The Conditions Rating is the addition of the points a bowler scored in the four criteria. The Weightage of the Rating is 30%.

RANK	BOWLER	AWAY	HOME	UC	FC	CON PTS
1	BS Chandrasekhar	865.36	244.05	912.94	243.26	271.87
2	DL Underwood	889.89	210.96	886.48	250.00	268.48
3	BS Bedi	810.56	218.75	900.38	212.34	257.04
4	Mushtaq Mohammad	711.88	162.02	784.58	158.34	218.02
5	AA Mallett	634.54	208.82	778.33	125.00	209.60
6	JD Higgs	647.00	170.83	727.32	150.12	203.43
7	LR Gibbs	628.91	172.34	653.23	208.16	199.52

SECONDARY CRITERIA

The Secondary Rating consists of three parts. If Innings are less than the Qualification than the Player gets 50% of the Points.

The three secondary criteria and thier weightage is as follows:-

CRITERIA	POINTS
Wickets Per Inn	50.00
Top Form	100.00
Impact Innings	150.00

WKTS/INN

WPI RATING

Points to note about WPI Rating:-

It gives points for three criteria.
The number of wkts per inn overall and aganst Top Teams.
The number of bowled victims per inn.
The number of top 7 batsmen dismissed per inn.

Min Innings Vs Top Teams: 20

RANK	BOWLER	INNS	WKTS	W/I	RAT	WTG
1	BS Chandrasekhar	70	180	2.57	1,000.00	50.00
2	BS Bedi	84	196	2.33	918.04	45.90
3	DL Underwood	106	202	1.91	849.98	42.50
4	LR Gibbs	56	100	1.79	723.73	36.19
5	JD Higgs	26	51	1.96	718.15	35.91
6	AA Mallett	51	91	1.78	623.10	31.16
7	Mushtaq Mohammad	51	65	1.27	498.09	24.90

TOP FORM

TF RATING

Points to note about TF Rating:-

TF is calculated by taking the best 30 consecutive innings of a bowler.
The inns are taken such that his points are maximum.
Only innings against Top Teams are considered.

Min Innings Vs Top Teams: 15

RANK	BOWLER	INNS	WKTS	AVE	SR	RAT	WTG
1	BS Chandrasekhar	30	80	25.65	55.06	992.68	99.27
2	BS Bedi	30	82	28.94	69.72	907.08	90.71
3	DL Underwood	30	56	29.45	79.39	743.73	74.37
4	LR Gibbs	30	62	30.11	89.82	739.25	73.92
5	JD Higgs	26	51	32.86	78.10	725.41	72.54
6	Mushtaq Mohammad	30	40	28.20	63.23	723.07	72.31
7	AA Mallett	30	51	30.96	80.65	721.35	72.14

IMPACT INNINGS

II RATING

Impact Innings (II) are those innings which have an impact either in terms of wickets or strike rate. Know All About II. These are the criteria for an inning to be included in II:-

A Bowler equal to or more wickets than 2 at a good AVE or SR.
The required AVE or SR is increases as the number of wickets taken increases.

Min Innings Vs Top Teams: 20

RANK	BOWLER	INNS	II	II Perc	RAT	WTG
1	DL Underwood	106	41	38.68	871.90	130.79
2	BS Chandrasekhar	70	31	44.29	864.35	129.65
3	BS Bedi	84	33	39.29	784.53	117.68
4	AA Mallett	51	20	39.22	772.79	115.92
5	LR Gibbs	56	17	30.36	611.89	91.78
6	JD Higgs	26	9	34.62	592.81	88.92
7	Mushtaq Mohammad	51	16	31.37	580.04	87.01

SECONDARY RATING

The Secondary Rating is the addition of the points a bowler scored in the three criteria. The Weightage of the Rating is 30%.

RANK	BOWLER	TF	WPI	II	SEC RAT
1	BS Chandrasekhar	99.27	50.00	129.65	278.92
2	BS Bedi	90.71	45.90	117.68	254.29
3	DL Underwood	74.37	42.50	130.79	247.66
4	AA Mallett	72.14	31.16	115.92	219.21
5	LR Gibbs	73.92	36.19	91.78	201.90
6	JD Higgs	72.54	35.91	88.92	197.37
7	Mushtaq Mohammad	72.31	24.90	87.01	184.22

DECADES RATING

DECADES Rating is the addition of the points of all the above criteria. The rating is out of 1,000 Pts.

RANK	BOWLER	NAT	PRI RAT	CON RAT	SEC RAT	FIN RAT
1	BS Chandrasekhar	IND	387.76	271.87	278.92	938.55
2	DL Underwood	ENG	367.67	268.48	247.66	883.81
3	BS Bedi	IND	355.72	257.04	254.29	867.06
4	AA Mallett	AUS	312.88	209.60	219.21	741.69
5	Mushtaq Mohammad	PAK	293.51	218.02	184.22	695.75
6	LR Gibbs	WI	283.30	199.52	201.90	684.71
7	JD Higgs	AUS	280.11	203.43	197.37	680.91

BRIEF EXPLANATION

Dynamic Nature

Most of our ratings are dynamic, and as new matches are played, the rating of earlier bowlers may change if current bowlers set new benchmarks.

Trend Setter (TS)

TS is the player who does the best in a criteria.
The rating of all other players are calculated taking the TS as the benchmark. Example:-
TS Bowling Ave: 25.00; Player X Ave: 30.00; Section Points: 300.00
TS Points: 300.00 (Max)
Player X Points: TS Ave/Ave X 300 = 25.00/30.00 X 300 = 250.00.
Ratings of all sections are calculated similarly with Ave being replaced by the Criteria Stat.
Know All About the Trend Setter

Top Teams (TT)

An opposition is counted as a TT considering its Win/Loss (WL) Ratios in last 7 years.
Home, Away, In Asia, Outside Asia and Overall WL Ratio is considered.
The WL Ratio should be more than a certain value overall or in specific conditions.