June 30, 2006 SandRidge Capital, Inc.

Exhibit 10.5

Citigroup Managed Futures LLC
000 Xxxxxxxxx Xxxxxx
00^xx Xxxxx
Xxx Xxxx, XX 00000

Tel 000 000 0000
Fax 000 000 0000

June 30, 2006

XxxxXxxxx Capital, Inc.

0000 Xxxx Xxx Xxxx., Xxxxx 000

Houston, Texas 77056

Attention: Xx. Xxxxxx X. Xxxx

Re: Management Agreement Renewals

Dear Xx. Xxxx:

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, 2007 and all other provisions of the Management Agreements will remain unchanged.

• SB Bristol Energy Fund LP

• CMF XxxxXxxxx Master Fund LP

Please acknowledge receipt of this modification by signing one copy of this letter and returning it to the attention of Xx. Xxxxxx XxXxxxxxx at the address above or fax to 000-000-0000. If you have any questions I can be reached at 000-000-0000.

Very truly yours,
CITIGROUP MANAGED FUTURES LLC
By:	/s/ Xxxxxx X. XxXxxxxxx, Xx.
	Xxxxxx X. XxXxxxxxx, Xx.
	Chief Financial Officer & Director

By: 
/s/ Xxxxxx X. Xxxx

Print Name:
/s/ Xxxxxx X. Xxxx

DRMcA/sr