NRL | Round 9

alphr.com.au

SYD
Roosters
VS
DOL
Dolphins
SUNCORP STADIUM, BRISBANE • FRIDAY 2 MAY, 8:05 PM

Win Probability

AI Game Review

Our model correctly predicted Roosters to win at 53% probability. The predicted margin of 5.2 was reasonable against the actual 10-point result. The game's 62 points came in 17 points higher than the predicted 45. The model went 2/3 on this match. The 1-12 margin band call landed.

Model vs actual outcomes • Post-match analysis

🏁

AI Referee Insights

Grant Atkins officiated this match (318 career games). The combined score of 62 points was 19 points above Grant Atkins's career average of 43. Roosters's victory aligns with Grant Atkins's historical trend, Roosters have a 63% win rate under this referee. Grant Atkins averaged 14.4 penalties per game heading in, a whistle-heavy referee profile.

Based on referee career statistics • Post-match analysis

Momentum Replay
Beta
80', Roosters firmly in control (99%)
ROO36
99%80'1%
26DOL
HT100%50%0%0'20'40'60'80'
Dolphins momentumMomentum -16Roosters momentum →
Next Try (within 10 min)
AI Model
82% none
ROO 10%No try 82%DOL 8%
Biggest Swings

AI Win Probability

53%RoostersFavourite

Roosters

53%

Dolphins

47%

AI Match Overview

This shapes up as one of the tightest matchups of the round. Our model gives Roosters a marginal 53% edge, making this essentially a coin-flip contest. Dolphins are stronger on paper across 4 of 7 key factors, including ELO Difference, Forward Pack and Backline Quality, but Roosters counter with Halves Control and Venue Advantage which tips the scales. Recent form favours Dolphins with 3 wins from their last 5 compared to 2 for Roosters. The margin model predicts Roosters by 5.2 points with a combined total of 45.

Generated from model features • Pre-kick-off analysis

Edge Analysis

1 ACTIVE EDGE

Each market is predicted by an independent model, H2H, margin, and totals may occasionally disagree.

H2H Recommendation

Roosters to Win @1.85

Winner ✓

Edge

+2.6%

Line / Spread

Roosters -1.5 @1.91

Winner ✓

Edge

+2.6%

Total Points

Under 48.5 @1.91

Lost ✗

Edge

+10.2%

Form & History

TeamLast 5Avg Pts
Roosters
W
W
L
L
L
22.0
Dolphins
W
W
W
L
L
29.6

Avg Conceded

24.8

Roosters

20.8

Dolphins

Avg Margin

-2.8

Roosters

8.8

Dolphins

Run Metres

1659

Roosters

1728

Dolphins

Line Breaks

5.8

Roosters

4.4

Dolphins

Referee Indicator

Favours Roosters

Grant Atkins

318 career games · since 2013

AI Analysis

Win rate when Grant Atkins refs each team (vs any opponent)

Roosters
35W – 21L
63%
Dolphins
6W – 6L
50%

Roosters hold a 13-point edge: 35W–21L (63%) vs Dolphins's 6W–6L (50%).

Avg Total

43.2 pts

Home Win %

54%

Home Bias

Leans home

Penalty & Discipline

Pen / Game

14.4

Sin Bins / Gm

0.29

SB Away %

56%

Avg Penalties Per Game

vs Home Teams6.8
vs Away Teams7.6

Penalty Advantage Under This Ref

Positive = opponent penalised more than your team

Roosters
+0.3
Dolphins
+0.0

Grant Atkins averages 14.4 penalties per game, above the league norm. Expect frequent stoppages. Penalises away teams more, 6.8 against home vs 7.6 against away.

H2H History (Last 4)Roosters lead 3-1
Aug 2025SYD 64 - 12 DOL
Aug 2024SYD 40 - 34 DOL
Aug 2023SYD 30 - 14 DOL
Mar 2023SYD 18 - 28 DOL
Prediction BreakdownPure Alpha Model

ELO–Market Disagreement

Dolphins hold the ELO advantage (1481 vs 1473), but the market favours Roosters (@1.85).

The model sides with the market, other factors override the ELO gap.

📊Team ELO Ratings

SYD
1473Overall1481
DOL
ELO difference: -8 in favour of Dolphins

🏈Positional Matchups

Player ELO aggregated by position group, higher = stronger unit

1037Forwards1095
Best: 1253DOL +58Best: 1261
1040Backs1048
Best: 1138EvenBest: 1158
1375Halves1015
Best: 1375SYD +359Best: 1015
977Hooker1187
DOL +210

📈Recent Form (Last 5)

SYD
Stat
DOL
2.0
Wins (Last 5)
3.0
22.0pts
Avg Score
29.6pts
24.8pts
Avg Conceded
20.8pts
-2.8pts
Avg Margin
8.8pts
1659.4m
Run Metres
1728.2m
5.8
Line Breaks
4.4
343.0
Tackles
356.6
14.2
Errors
9.8

🔑Key Prediction Factors

What the model weighted most in this prediction

1
ELO Difference14.0%
Dolphins
2
Forward Pack12.0%
Dolphins
3
Backline Quality10.0%
Dolphins
4
Halves Control9.0%
Roosters
5
Recent Win Rate9.0%
Dolphins
6
Referee Tendency7.0%
7
Venue Advantage7.0%
Roosters

Model Confidence

53%

Roosters predicted to win by 5 points

Predicted total: 45 · Line: +5.2

2/3 match predictions correct
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