Cribbage Pegging Traps: Set Them, Spot Them, Escape Them
Master cribbage pegging traps — the pair trap, fifteen setup, run trap, and 31 engineering. Learn how to bait big points and how to avoid falling into your opponent's schemes.
Cribbage Pegging Traps: Set Them, Spot Them, Escape Them
Most beginners approach pegging reactively: they play cards and score whatever happens. Expert players approach pegging like a chess player — anticipating the counter, engineering sequences, and watching for the opponent’s bait.
This guide covers the four major pegging traps, how to set each one, and how to recognize when you’re about to fall in.
The Pair Trap
Setup: Lead (or play) a card while holding its partner in hand, hoping opponent will pair it — then you triple for 6 points.
How It Works
You hold: 7 — 7 — 4 — J
You lead the 7.
| Play | Count | Scorer | Points |
|---|---|---|---|
| You: 7 | 7 | — | — |
| Opponent: 7 | 14 | Opponent | 2 (pair) |
| You: 7 | 21 | You | 6 (triple!) |
Opponent paired without checking if you might triple. You scored 6 points vs their 2.
When to Set the Pair Trap
The trap is most effective with mid-value cards (5-9). Opponents tend to pair freely with these because they don’t look “dangerous.” High cards (K, Q) are harder to triple because opponents tend to be more cautious — and your opponent is less likely to hold a matching K/Q.
| Trap card | Risk to you | Risk of opponent avoiding | Best for… |
|---|---|---|---|
| 5 | High (opponent pairs → your triple still beats 6 pts) | Low — they’ll pair | Always worth setting |
| 7 or 8 | Medium | Medium | Good choice |
| J | Low-medium | Medium | Plus nobs setup |
| K or Q | Low | High (common cards, obvious) | Weaker trap |
Don’t set the trap if:
- You’re late in pegging and can’t afford opponent’s 2 points
- The pair card doesn’t benefit from a triple (you only have one copy)
- The running count would let opponent immediately 31 after tripling
Spotting the Pair Trap (Defending)
Before you pair opponent’s card, ask: could they triple me?
Red flags that the lead is a pair trap:
- Opponent hesitated before playing (thinking through the trap)
- Opponent has a known strategic style (experienced players)
- The card is an unusual lead (6, 7, 8 — not the most common opening leads)
Defensive response: Play a card that doesn’t pair the lead. Ignore the 2-point pair and deny the triple.
The Fifteen Setup
Setup: Play your first pegging card specifically to position the running count for a future 15.
How It Works — Reactive Fifteen
Opponent leads a 6 (count = 6). You hold: 9 — K — 3 — A
You play 9: count = 15. You score 2 points. No trap needed — the 6+9=15 is immediate.
How It Works — Proactive Fifteen
You lead a 4 (count = 4). You hold another 4-card — wait. Or:
You lead a 6 (count = 6). Opponent plays a 3 (count = 9). You play 6 again (count = 15, score 2 pts).
Here the setup was the initial 6 lead — you anticipated that a low follow-up would let your second 6 land on 15. This requires:
- Knowing your own cards (you have two 6s, or a 6 + 9)
- Anticipating opponent will play low
- Count awareness
The 2-Card Fifteen Setup Chain
A more sophisticated version: you lead specifically to force a position where you’ll score 15 regardless of what opponent plays.
You hold: 5 — 5 — 4 — 6
Lead 4 (count = 4). If opponent plays:
- A 5: count = 9. You play 6: count = 15. Score 2.
- A 6: count = 10. You play 5: count = 15. Score 2.
- A 9: count = 13. You play… nothing reaches 15 perfectly. Opponent has disrupted the setup.
The lesson: no setup is guaranteed. The fifteen setup works most often when you have multiple routes to 15 — you can score the fifteen with different second cards depending on what opponent plays.
Defending Against Fifteen Setups
The classic defensive response: play a card that sets the count to 16-20 after your response, making a fifteen-response harder.
If you lead and the running count is at 7, 6, 5, 4, 3, 2, or 1 — those are all positions where opponent can potentially fifteen you. Safe count positions for you: 16-21 (opponent needs at most a 5 to respond; at 20 they need an ace; at 21 they need nothing for go).
The Run Trap
Setup: Begin building a run while holding the extensions in your hand that opponent can’t match.
How It Works
You hold: 6 — 7 — 8 — 2
Opponent leads 5. You play 6 (run=2, 2 pts). Opponent plays 4 (run=3, 3 pts). You play 7 (run=4, 4 pts). Opponent plays 3 (run=5, 5 pts). You play 8 (run=6, 6 pts). Opponent has nothing to extend: “go”.
Scores from this sequence: you 2+4+6=12, opponent 3+5=8. And you score last card. Devastating.
The run trap requires:
- Holding 3+ consecutive cards
- Opponent having adjacent run cards (which you can sometimes infer from leads)
- The count not exceeding 31 mid-run
The Reverse Run Trap
More subtly: you play into a run knowing opponent has a specific extension card, and you hold the card to extend beyond their reach.
You hold: 5 — 6 — 7 — K
You play 6. Opponent plays 7 (run=2). You play 5 (run=3, 3 pts). Opponent plays 8 (run=4, 4 pts). You play… K (not extending, count = 8+10=18+… wait, count is 6+7+5+8=26. K would be 36 — over 31).
Count awareness matters in runs. Long runs can exceed 31 and force you to stop extending.
Defending Against Run Traps
If you suspect opponent is baiting a run, break the run. When opponent plays a sequence card, respond with a card that’s far from the sequence (7 distance or more away from the last played card in rank).
Example: opponent plays 6, you hold 7 (tempting run), 5 (very tempting run), K, 3. Play the K or 3 — distant from the 6. Don’t extend the run unless you have reason to believe you’ll win the extension war.
Engineering 31
Setup: Calculate in real time whether 31 is reachable, then play cards that force the count to land on exactly 31 (worth 2 points).
Count Management
31 scoring requires: the sum of all cards played in the current pegging phase equals exactly 31.
Common paths to 31:
- Any four cards summing to 31: 10 + 10 + 10 + 1 = 31 (K+Q+J+A, for example)
- 10 + 9 + 8 + 4 = 31
- 7 + 7 + 7 + 10 = 31
- 6 + 6 + 9 + 10 = 31
How to Engineer 31
Track the running count. When the count reaches 21, you need exactly 10 to hit 31 (any face card or 10). When it reaches 22, you need a 9. When it reaches 28, you need a 3. When it reaches 30, you need an ace.
If you’re holding the card that hits exactly 31, manage the sequence so opponent doesn’t overshoot or disrupt. This often means playing your “off” cards earlier to burn down the sequence and save the killer card.
The 31 Finisher
You hold: A — K — 6 — 4. Count is at 14.
Play 6: count = 20. Opponent plays 4: count = 24. You play: K? 24+10=34 — over. 6? Already played. A: 24+1=25. Not 31.
You have no path to 31 here. But if count was at 21 and you held the K: 21+10=31. Score 2.
The lesson: 31 engineering requires knowing when to hold back. Play cards that leave the count in a position where your remaining card hits 31 exactly.
Defensive Pegging: Playing Off
“Playing off” means deliberately playing a card that doesn’t help opponent’s setup and doesn’t extend any dangerous sequences.
When to Play Off
- You’re ahead by 15+ points and approaching 121: protect the lead
- Opponent has scored heavily in pegging and you can’t afford more damage
- Opponent’s lead pattern suggests a trap (they hesitated, they led an unusual card)
- Late-game survival: one point matters — don’t risk 6 to gain 2
The Best “Off” Cards
An off card should:
- Not pair any card already played
- Not make 15 (or 31) with the running count
- Not extend any visible run sequence
- Not position the count for an easy response from opponent
Cards that are often good “off” plays: kings, aces (at high counts), and any card that sets the count to 16-20.
The Sacrifice Play
Sometimes you give opponent a 15 or a pair to avoid a worse outcome.
Example: Count is at 12. Opponent might have a 3 (to make 15). You hold a 3 and a 7.
- Play the 3: count = 15, opponent pairs immediately if they have one = 2 pts to you, possibly 2 to them
- Play the 7: count = 19. Opponent’s 3 would reach 22 — no immediate fifteen
Playing the 7 here “plays off” the obvious fifteen bait and doesn’t invite the pair trap on the 3.
Putting It Together: Pegging Flow
Elite pegging is simultaneous on all four fronts:
| Frame | Your Goal | Opponent’s Goal |
|---|---|---|
| Opening | Set pair trap OR secure a safe, neutral count | Same |
| Mid-pegging | Engineer 15s, extend runs | Watch for traps, play off |
| Late (high count) | Hold ace/low card for 31 or last | Hold ace/low card for 31 or last |
| Second round | Same sequence with remaining cards | Same |
The player who wins the pegging phase is usually the one who:
- Sets the most traps successfully
- Avoids the most opponent traps
- Manages the count toward 31 more often
Pegging Trap Quick Reference
| Trap | Setup | Score Potential | Counter |
|---|---|---|---|
| Pair trap | Lead from a pair | 6 pts (triple) | Don’t pair suspicious leads |
| Fifteen setup | Play a counting card | 2 pts | Set count to 16-20 after lead |
| Run trap | Start sequence with extensions | 3-12+ pts | Play far from the run in rank |
| 31 engineering | Hold finisher, manage count | 2 pts | Play through 31-reachable zones fast |
Key Takeaways
- Pair trap is the highest-yield and most common trap — lead pairs to bait triples
- Fifteen setups require count awareness and multiple paths to 15
- Run traps need 3+ connected cards and the ability to outlast opponent’s extensions
- 31 engineering means timing your last card to hit exactly 31
- Defensive play (“playing off”) is correct when you’re ahead or can’t see a clear offensive path
- Track the count always — every pegging decision depends on knowing where you are
Practice recognizing these patterns in real hands: play a free game against our AI and watch how each pegging sequence unfolds.