Sergeant Major

Your personal rating change from a win or loss is a direct function of the DIFFERENCE between enemy MMR (eMMR) and your personal rating (CR). I looked at this closely during patch 9.0 and found it to be a simple linear correlation which held true regardless of absolute rating level (data below comes from games with CR 1700-2450). Here are the key conclusions to help predict your CR change -

If eMMR vs CR = -200, then a win changes CR by +6, a loss changes CR by -18
If eMMR vs CR = -100, then a win changes CR by +8, a loss changes CR by -16
If eMMR vs CR = -50, then a win changes CR by +10, a loss changes CR by -13
If eMMR vs CR = +0, then a win changes CR by +12, a loss changes CR by -12
If eMMR vs CR = +50, then a win changes CR by +14, a loss changes CR by -11
If eMMR vs CR = +100, then a win changes CR by +15, a loss changes CR by -8
If eMMR vs CR = +200, then a win changes CR by +18, a loss changes CR by -5

Achievement

Title

Rate

Grand Marshal

[title=208]

2400

Field Marshal

[title=207]

2300

Marshal

[title=206]

2200

Commander

[title=205]

2100

Lieutenant Commander

[title=204]

2000

Knight-Champion

[title=203]

1900

Knight-Captain

[title=202]

1800

Knight-Lieutenant

[title=201]

1700

Knight

[title=200]

1600

Sergeant Major

[title=199]

1500

Master Sergeant

[title=198]

1400

Sergeant

[title=197]

1300

Corporal

[title=196]

1200

Private

[title=195]

1100