Introduction

Looking at a bet like "1-2-3" or "4-5-6," could you explain why that particular combination?

Boat racing has a concept called "suji" — a theory of how a race tends to unfold. Understanding suji lets you build your bets by imagining how the race will actually play out, instead of just picking numbers.

This article covers everything from the basics of suji betting to how to apply it in practice.

What is a suji bet?

Definition

A suji bet is a bet built around boat racing's theory of race development.

In boat racing, the battle for the first turn mark on lap 1 (the "1 mark") essentially decides the race. And there's a general rule: which boat takes the lead at that turn strongly influences the pattern of finishers behind it.

Why does suji exist?

Boat racing courses turn counterclockwise. Going around the first mark:

• Inside boats: have a shorter turning arc and can turn first
• Outside boats: have a longer turning arc and tend to fall behind

Because of this, the winning boat's lane determines which boats are likely to finish 2nd and 3rd.

Basic suji patterns

Inside wire-to-wire suji (when lane 1 wins)

The most basic pattern — lane 1 nails the start and wins wire-to-wire.

Typical bets:

1-2-3 (the classic favorite combination)
1-2-4 (an inside-pass pattern)
1-3-2 (lane 3 ahead of lane 2)
1-3-4

Key points:

• When lane 1 wins wire-to-wire, the outside lanes 5 and 6 generally don't factor in
• "1-2-6" and "1-5-6" are against the suji (combinations that are less likely to come in)
• The suji listed here are examples for thinking through race development. Combinations you leave out of your candidates can still come in

Overtake suji (when an outside lane wins)

Lanes 3–6 attack from the outside and take the first turn.

Lane 3 overtake

Typical bets:

3-4-5 (a pure overtake development)
3-4-1 (outside overtake + inside holds on)
3-1-4 (an inside-pass development)

Lane 4 overtake

Typical bets:

4-5-6 (a big outside overtake)
4-5-1 (overtake + inside holds on)
4-3-5 (lane 3 holds for 2nd)

Inside-pass suji

The inside boat takes the lead at the turn, but gets passed on the inside.

Key points:

• An inside pass is a signature move of racers skilled at turning
• When an inside pass lands, the original inside boat often still holds on for 2nd

Suji quick-reference table

A handy suji quick-reference table worth memorizing.

The rule of thumb:

• Inside lane wins → inside lanes tend to follow
• Outside lane wins → outside lanes tend to follow

Against the suji (unlikely combinations)

Understanding suji also tells you which combinations are unlikely to come up.

Outside boats coming in despite an inside wire-to-wire (against the suji)

❌ 1-5-6 (rare for lanes 5 and 6 to finish 2nd/3rd behind a lane-1 wire-to-wire win)
❌ 1-6-5
❌ 1-6-2

Inside boats coming in despite an outside overtake (against the suji)

❌ 4-1-2 (rare for lanes 1 and 2 to follow behind a lane-4 overtake win)
❌ 5-1-2
❌ 6-1-2

When against-the-suji results happen:

• A highly chaotic race
• A capsize or a racer falling overboard
• A wildly scattered start

Against-the-suji results pay out big, but they're hard to target deliberately.

How to bet using suji

Strategy 1: Narrow your bets with suji

Use suji to trim down your bet combinations

Example: a race where lane 1 looks likely to win

Every combination: 1-234-234 = 6 combinations
Narrowed by suji: 1-2-3, 1-2-4, 1-3-2, 1-3-4 = 4 combinations

Cutting just 2 combinations already improves your return rate.

Strategy 2: Choose a suji from your predicted race development

Use the start exhibition as a reference to predict the development, and pick your suji accordingly

[Predicted development]
- Exhib. ST: lane 1 slow
- Exhib. ST: lane 4 fast
→ May overtake in the race
→ Lane-4 overtake suji

[Bets]
4-5-6 (overtake)
4-5-1 (inside holds on)
4-3-5 (lane 3 holds 2nd)

The start exhibition is only a reference. The approach and start in the actual race can differ from the exhibition, so don't treat the exhibition's lineup or ST as the actual race lineup.

Strategy 3: Split your bankroll between the main line and a hedge

Put the suji combinations as your main line, and against-the-suji combinations as a hedge

[Main line (suji combinations)] 80% of bankroll
1-2-3: ¥1,000
1-2-4: ¥800
1-3-2: ¥600

[Hedge (against the suji)] 20% of bankroll
1-5-4: ¥300
1-6-4: ¥300

Suji tendencies by venue

Suji tendencies differ from venue to venue.

Venues where an inside wire-to-wire suji is common

→ The 1-2-3 and 1-2-4 suji combinations land often

Venues where an overtake suji is common

→ The 3-4-5 and 4-5-6 suji combinations show up often

Combining AI with suji

Combining Ryujin Radar's predictions with suji theory sharpens your accuracy even further.

How to use it

1. Check the AI's prediction

   • 1st predicted: lane 4
   • 2nd predicted: lane 5
   • 3rd predicted: lane 1

2. Check it against suji

   • Lane 4 finishing 1st → the lane-4 overtake suji
   • 4-5 matches the suji ✓
   • 4-5-1 fits naturally as "overtake + inside holds on" ✓

3. A suji match raises your confidence

   • AI prediction matches the suji → higher confidence
   • AI prediction goes against the suji → treat with caution

FAQ

Q. Can I win just by betting the suji every time?

A. Suji alone won't guarantee a win.

Suji only represents "the pattern that tends to come up" — not a certainty. What matters just as much:

• Reading the race development with the start exhibition as a reference (the actual race's approach and start can differ from the exhibition)
• Racer ability and motor performance
• The effects of wind and waves

Think of suji as a tool for narrowing down your bets, not a complete answer on its own.

Q. Should I avoid betting against the suji?

A. It depends on the situation.

• Normally, prioritize the suji combinations
• In a race that looks likely to be volatile, hedge a small amount against the suji too
• Against-the-suji payouts are large, so it's a reasonable form of insurance

Q. How do I remember suji patterns?

A. Remember it as "the boats near the winner tend to follow."

• Lane 1 wins → lanes 2, 3 follow (nearby)
• Lane 4 wins → lanes 5, 6 follow (nearby)
• The exception is an inside pass, where an inside boat holds on

Summary

Key points on suji betting

1. Suji is a theory of race development

   • If an inside lane wins, inside lanes tend to follow
   • If an outside lane wins, outside lanes tend to follow

2. Use suji to narrow your bets

   • Betting every combination is capital-inefficient
   • Suji can trim your bets by 2–3 combinations

3. Against-the-suji results are rare

   • "1-5-6" and "4-1-2" are uncommon
   • They pay out big when they land, but they're hard to target

4. Factor in venue character

   • Inside-favoring venues → lean on inside wire-to-wire suji
   • Overtake-heavy venues → lean on overtake suji

5. Combining it with AI works well

   • AI prediction matching the suji → higher confidence
   • AI prediction going against the suji → proceed cautiously

Tags: #BoatRacing #SujiBetting #BettingStrategy #RaceDevelopment #DataAnalysis #AIPrediction #RyujinRadar