Newbury draw bias

Yes, in places. Across 381 races from 2023-06-01 to 2026-06-09: over 7-8f — moderate: middle favoured (iv 1.16). 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 · 381 races · updated 9 June 2026

5-6f · 100 races

No meaningful draw bias

5-6f · 100 races · field avg win 8.6%

No meaningful draw bias

Draw	Win %	Top-3 %	IV	A/E	PRB	Runs
Low (inside)	8.6% 36 wins	16%	1.00 vs course avg	1.07 vs market	61.7%	419
Middle	8% 28 wins	14.8%	0.93 vs course avg	0.92 vs market	59.2%	352
High (outside)	9.2% 36 wins	13.3%	1.07 vs course avg	0.99 vs market	58.9%	392

7-8f · 147 races

Moderate: middle favoured (IV 1.16)

7-8f · 147 races · field avg win 8.8%

Moderate: middle favoured (IV 1.16)

Draw	Win %	Top-3 %	IV	A/E	PRB	Runs
Low (inside)	8.7% 53 wins	15.4%	0.99 vs course avg	1.13 vs market	60.2%	609
Middle	10.2% 52 wins	17.6%	1.16 vs course avg	0.91 vs market	62.6%	511
High (outside)	7.5% 42 wins	13%	0.86 vs course avg	0.92 vs market	57.1%	560

9-12f · 109 races

No meaningful draw bias

9-12f · 109 races · field avg win 9.3%

No meaningful draw bias

Draw	Win %	Top-3 %	IV	A/E	PRB	Runs
Low (inside)	10.7% 45 wins	17.6%	1.15 vs course avg	1.10 vs market	65.5%	421
Middle	8.5% 30 wins	13.9%	0.91 vs course avg	0.97 vs market	62.9%	352
High (outside)	8.6% 33 wins	14.3%	0.92 vs course avg	0.92 vs market	61.1%	385

13f+ · 25 races

Sample too small to call

13f+ · 25 races · field avg win 10.8%

Sample too small to call

Draw	Win %	Top-3 %	IV	A/E	PRB	Runs
Low (inside)	9.5% 8 wins	19%	0.88 vs course avg	0.62 vs market	59.4%	84
Middle	11.6% 8 wins	18.8%	1.08 vs course avg	1.59 vs market	61.9%	69
High (outside)	11.4% 9 wins	22.8%	1.06 vs course avg	0.90 vs market	67%	79

Common questions

Is there a draw bias at Newbury?

Does the market already price in the Newbury draw bias?

Largely, yes. Every favoured third at Newbury shows A/E below 1 — the market over-bets the famous stalls, so blindly backing the bias has lost money against Betfair prices.

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.