The chart at the bottom of this web page identifies a trend favouring horses drawn in central stalls - away from the High rail towards the Centre of the course when the stalls have been positioned High, and an advantage away from the Low rail, towards the Centre of the course when the stalls have been positioned Low.

York racecourse have positioned the stalls Centre in most 5F and 6F sprints for older horses 28 may 2004 to the end of 2006.
The top chart shows the results with stalls Centre.
The faster ground down the Centre of the course on good or better going will still exist, but we should not assume that horses drawn in middle stalls will be those most favoured in the long term.
The trends shown here on the top chart are very short term, and consist of very small samples.

Major drainage work was carriued out at York in 2008.  These charts show resultsv before that

Link to course and distance menu    Race Of The Week    York 6F   York 7F     York 7F 205yds     York 1m 2F

Horse racing draw advantage bias York 5F    Stalls Centre 
See
2nd chart below for results, Low, and High

WINNING STALL NUMBER

 1  2  3  4  5  6  7  8  9 10 11 12 13 14 15 16 17 18 19 20 21 22 23
No

of

R

U

N

E

R

S

8     1       1 1
9                   Stalls Centre
3yr olds and older
2004 + 2006
10                    
11       1 1            
12                   1    
13                          
14 1           1     1     1  
15         11                    
16     1         1                
17           1   1                  
18                                    
19                                      
20                           1   1   1    
21                                          
22                                            
23                                              
1 0 2 0 0 0

<--Good or better -->

1 1 0 1 1 1
5 5

Copyright 2005 [H Hutchinson]. All rights reserved.

There are not yet enough results here to make an accurate assessment of the draw with stalls Centre.
The chart has been split into thirds as per the Racing Post "Top Draw" method.
This allows us to identify the Middle stalls, highlighted in green.
Either side of the Green cells is either the Low third or High third of the runners.
Blue and yellow show the Top 6 and Bottom 6 stalls as usual.

So far, things are looking very even, which is probably what York Racecourse are trying to achieve.  Results are spread.
On good or better going, the Top 6 stalls won 5 of 10 races 50%, a very low percentage for 6 stalls, especially from so few races.
Stalls 1 to 6 won 3 of 10 races.

On good or better going, the Middle third of the stalls won 2 of 10 races.

On good/good to soft in places or softer going, the Middle third won 2 of 9 races.
The Low third won 4 of 9 races.
There is no recommendation with stalls Centre.

2006 results :- 3-8, 8-8, 4-11 (H), 5-11, 13-14, 3-16, 6-17,
                      5-20 (H), 16-20.  All had stalls Centre except where indicated.

2005 Stalls Centre results :-  7-8, 4-11, 1-14, 7-14, 8-16, 8-17, 14-20

2004 Stalls Centre results :- 10-12, 10-14, 5-15, 5-15, 18-20

These would be the "Top Draw" splits for the Low third, Middle third and High third :-
8 runner split Low, Middle and High = 3 stalls, 2 stalls, 3 stalls : 
9 runners  = 3,3,3: 10 = 3,4,3: 11 = 4,3,4: 12 = 4,4,4
13 = 4,5,4: 14 = 5,4,5:  15 = 5,5,5:  16 = 5,5,6: 17 = 6,5,6:
18 = 6,6,6: 19 = 6,7,6: 20 = 7,6,7 etc. 

YORK 5F  Stalls usually positioned HIGH ( Low shown L, Centre  C )

Link to course and distance menu

WINNING STALL NUMBER

 1  2  3  4  5  6  7  8  9 10 11 12 13 14 15 16 17 18 19 20 21 22 23
No

of

R

U

N

E

R

S

8   1            
9       1           Stalls High and Low
3yr olds and older
10 seasons results
1997 - 2006
10   11                
11       1             1
12           L             
13          11                
14     1      1                
15 1    1     1 1             L  
16       1     1           L      
17 1 1             1     1          
18                     L 1     1      
19                                      
20         1       1 1     11   1          
21                             11            
22         1                                  
23   1     1 1     1   1 1 1                    
2 5 2 2 5 2

<--Good or better -->

3 0 2 0 1 0
23 12

Copyright 2003 [Howard Hutchinson]. All rights reserved.

During 2004, 2005 and 2006 the stalls were positioned Centre for most races..
Prior to 2004 we had the makings of a very promising pattern favouring Low stalls (towards the Centre of the course, away from the High rail).
See the chart above for stalls positioned Centre..

Stalls High.  On good or better going, in races of 8 - 16 runners
stalls 1 - 6 won 11 of 12 races  91 %.

The other win came from stall number 7.
There were no wins from the Top half of the draw.
That looks a very impressive percentage, but 12 results is a very small sample.
Above 16 runners, wins spread to higher stalls.
It would be best to wait for more races to be sure of the pattern, but you may choose to follow that trend if the stalls are positioned High.
In 2006, stalls 1 to 4 won 2 of 2 races with stalls High :-  4-11, 5-20.

There is another interesting point on this chart, which points to what is happening on the racecourse.
These 11 of 12 wins came from the lowest numbers, when the stalls were placed against the High rail.
Therefore these wins have come from stalls towards the Centre of the course, or at least away from the High rail.
Also on this chart, are 3 results which occurred when the stalls were positioned Low.
These wins have come from the Top 2, and 4 stalls, plus 1 from the Top 1/2 (11 of 18).
This is a further indication that there could be an advantage towards the middle of the course, this time away from the Low rail.
If you compare this with the York 6F results, there is a very similar pattern but only from High positioning of the stalls.

2006 results :- 4-11 (H), 5-20 (H)  All other races had stalls Centre.

2005 results :- All races had stalls positioned Centre.  See Top chart.

2004 results :-  10-20 (High).  All other races had stalls Centre.