Here’s an analysis of **Race 4** based on the provided form guide:

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### **Top Contenders**
1. **BEAUTY LIGHT (No. 1)**  
   - **Last 6 Runs:** Excellent recent form with a **win (1st)** in its last race.  
   - **Jockey:** Z Purton, one of the top jockeys, boosts its chances significantly.  
   - **Draw:** Barrier 8 is slightly wide but manageable.  
   - **Rating:** A significant increase of 7 indicates strong recent performance.  

2. **SIGHT HAPPY (No. 4)**  
   - **Last 6 Runs:** Consistent, with a mix of top-5 finishes, including a **4th place** recently.  
   - **Draw:** Barrier 12 is challenging but not insurmountable.  
   - **Gear:** CP (Cheekpieces) added for focus.  
   - **Rating:** Positive movement (+6), indicating improving form.

3. **SHINKANSEN (No. 12)**  
   - **Last 6 Runs:** Solid recent form with a 2nd, 3rd, and 4th place in its last five runs.  
   - **Draw:** Barrier 11 is wide but could work with good positioning early.  
   - **Gear:** CP/H/TT (Cheekpieces, hood, tongue tie) for focus and breathing.  
   - **Weight:** Lightest in the field at 120 lbs, a potential advantage.

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### **Potential Upsets**
1. **HAPPY TANGO (No. 5)**  
   - **Last 6 Runs:** Includes a **win (1st)** and a 3rd place, showing it can compete.  
   - **Draw:** Barrier 6 offers good flexibility for positioning.  
   - **Gear:** Blinkers (B) to aid focus.  
   - **Weight:** Reasonable at 125 lbs.  

2. **LUCKY GENERATIONS (No. 7)**  
   - **Last 6 Runs:** Mixed results, but two 4th places suggest potential.  
   - **Draw:** Barrier 5 is ideal for a competitive start.  
   - **Gear:** H/P/TT (Hood, pacifiers, tongue tie) indicate adjustments to improve performance.  

3. **IRON LEGION (No. 3)**  
   - **Last 6 Runs:** No recent performance data (debut or long break).  
   - **Draw:** Barrier 7 is decent.  
   - **Gear:** B1/TT1 (First-time blinkers and tongue tie) indicate a highly focused preparation.  

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### **Dark Horses**
1. **BULB EMPEROR (No. 8)**  
   - **Last 6 Runs:** Mid-pack finishes, with consistent top-6 performances.  
   - **Weight:** Light at 123 lbs.  
   - **Gear:** B/TT for focus and breathing improvement.  

2. **DRACO (No. 11)**  
   - **Last 6 Runs:** Midfield finishes but has potential for improvement with gear adjustments (H-/CP1/TT).  
   - **Draw:** Barrier 3 offers an inside track advantage.  
   - **Weight:** 121 lbs with a 2-lb apprentice claim.  

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### **Factors to Consider**
- **Barrier Positions:** Horses like **CIRCUS REEL (No. 9)** and **DRACO (No. 11)** benefit from favorable inside draws.  
- **Gear Changes:** Look for first-time gear use (e.g., IRON LEGION with B1/TT1) or recent adjustments like cheekpieces or blinkers.  
- **Weight:** Lightweights like **SHINKANSEN** and **BULB EMPEROR** may have an edge in this field.  

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### **Suggested Bets**
- **Win Bet:** BEAUTY LIGHT (No. 1) for its recent win and Z Purton's expertise.  
- **Each-Way Bet:** SHINKANSEN (No. 12) for its consistent form and lightweight advantage.  
- **Value Bet:** HAPPY TANGO (No. 5) with its prior win and solid barrier draw.  

Let me know if you’d like further analysis or strategy! 🐎