Hou Yifan keeps control

Hou Yifan

Being a point down, Humpy Koneru switched to the somewhat more dynamic Open variation of the Ruy Lopez. However she was never able to generate any serious counterplay and it was the World champion who avoided a repetition. Hou Yifan even went on to win a pawn, but this was insufficient for victory due to the Indian's careful defence.

So summing up the fourth match game:

White	Rating	Country	Result	Black	Rating	Country	Moves	Opening
Hou Yifan	2578	CHN	0.5-0.5	Humpy Koneru	2600	IND	43	Spanish Open

So Hou Yifan still leads by one point:

Name	Rating	Country	Age	Highest ever rating	World rank	Points
Hou Yifan	2578	China	17	2612 (May 2011)	3	2.5
Humpy Koneru	2600	India	24	2623 (July 2009)	2	1.5

The earlier games of the match went as follows:

The first game:

White	Rating	Country	Result	Black	Rating	Country	Moves	Opening
Humpy Koneru	2600	IND	0.5-0.5	Hou Yifan	2578	CHN	80	Catalan Opening

The second game:

White	Rating	Country	Result	Black	Rating	Country	Moves	Opening
Hou Yifan	2578	CHN	0.5-0.5	Humpy Koneru	2600	IND	42	Petroff's Defence

The third game:

White	Rating	Country	Result	Black	Rating	Country	Moves	Opening
Humpy Koneru	2600	IND	0-1	Hou Yifan	2578	CHN	37	Queen's Gambit Ragozin

More information from the World Chess Federation website:

http://www.fide.com/

and

http://www.wwcc2011tirana.com