Exhibit 10.6

June 30, 2007

SandRidge Capital, L.P.
1300 Post Oak Blvd., Suite 325
Houston, Texas 77056

Attention: Mr. Andrew M. Rowe

Re:    Management Agreement Renewals

Dear Mr. Rowe:

We are writing with respect to your management agreements concerning the
commodity pools to which reference is made below (the ‘‘Management
Agreements’’). We are extending the term of the Management Agreements through
June 30, 2008 and all other provisions of the Management Agreements will remain
unchanged.

[spacer.gif] [spacer.gif] •  SB Bristol Energy Fund LP

[spacer.gif] [spacer.gif] •  CMF SandRidge Master Fund LP

[spacer.gif] [spacer.gif] •  Citigroup Energy Advisors Portfolio L.P.

[spacer.gif] [spacer.gif] •  SSB Diversified 2000 Futures Fund L.P.

[spacer.gif] [spacer.gif] •  CMF SandRidge Feeder (Cayman) Ltd.

Please acknowledge receipt of this modification by signing one copy of this
letter and returning it to the attention of Ms. Jennifer Magro at the address
above or fax to 212-793-1986. If you have any questions I can be reached at
212-559-5046.

Very truly yours,

CITIGROUP MANAGED FUTURES LLC

[spacer.gif] [spacer.gif] By:  /s/ Jennifer Magro                
Jennifer Magro
Chief Financial Officer and Director

[spacer.gif] [spacer.gif] By:  /s/ Andrew M. Rowe    

Print Name: Andrew M. Rowe    

JM/sr

--------------------------------------------------------------------------------