Doncaster draw bias

Yes, in places. Across 505 races from 2023-06-01 to 2026-06-09: over 9-12f — moderate: low (inside) favoured (iv 1.20). Check the A/E column before betting it: a bias the market already prices in is not an edge.

2023-06-01 – 2026-06-09 results · 505 races · updated 9 June 2026

5-6f · 155 races

No meaningful draw bias

5-6f · 155 races · field avg win 8.7%

No meaningful draw bias

Draw	Win %	Top-3 %	IV	A/E	PRB	Runs
Low (inside)	8.4% 54 wins	14.9%	0.96 vs course avg	0.90 vs market	60.2%	644
Middle	8.1% 44 wins	14.3%	0.93 vs course avg	1.19 vs market	59.2%	540
High (outside)	9.7% 57 wins	16.4%	1.11 vs course avg	0.95 vs market	62%	590

7-8f · 224 races

No meaningful draw bias

7-8f · 224 races · field avg win 8.5%

No meaningful draw bias

Draw	Win %	Top-3 %	IV	A/E	PRB	Runs
Low (inside)	9.4% 89 wins	17.2%	1.10 vs course avg	1.15 vs market	62.7%	950
Middle	7.8% 62 wins	12.8%	0.92 vs course avg	0.92 vs market	57.5%	796
High (outside)	8.2% 71 wins	15.4%	0.97 vs course avg	0.87 vs market	58.7%	862

9-12f · 100 races

Moderate: low (inside) favoured (IV 1.20)

9-12f · 100 races · field avg win 10%

Moderate: low (inside) favoured (IV 1.20)

Draw	Win %	Top-3 %	IV	A/E	PRB	Runs
Low (inside)	12% 44 wins	19.3%	1.20 vs course avg	1.15 vs market	61.4%	368
Middle	10.5% 32 wins	17.8%	1.05 vs course avg	0.91 vs market	61.9%	304
High (outside)	7.3% 24 wins	16.1%	0.73 vs course avg	0.90 vs market	57.9%	329

13f+ · 26 races

Sample too small to call

13f+ · 26 races · field avg win 11.2%

Sample too small to call

Draw	Win %	Top-3 %	IV	A/E	PRB	Runs
Low (inside)	16.3% 14 wins	23.3%	1.45 vs course avg	0.99 vs market	69.9%	86
Middle	10.3% 7 wins	17.6%	0.92 vs course avg	1.01 vs market	63.8%	68
High (outside)	6.4% 5 wins	12.8%	0.57 vs course avg	1.00 vs market	49.5%	78

Common questions

Is there a draw bias at Doncaster?

Does the market already price in the Doncaster draw bias?

Not fully. The favoured thirds at Doncaster hold A/E at or above 1 in our window — the bias has not been completely priced away, which is where a draw edge can actually pay.

What do IV, A/E and PRB mean?

IV (Impact Value) is the group's win rate versus all runners in the same races — 1.00 is neutral. A/E is actual wins versus what de-overrounded Betfair prices expected — below 1 means the market over-bets that group. PRB is the mean percentage of rivals beaten, a finer-grained placing measure.

Keep going

Method: stall numbers grouped into field thirds (low/middle/high) per race, so field size never skews the groups; IV against same-course same-band baseline; A/E against de-overrounded Betfair SP. Small samples are flagged rather than hidden. Racing Alpha does not accept bets. 18+ · BeGambleAware.org.