Common Cribbage Mistakes: 15 Errors That Cost You Games
Identify and fix the most common cribbage mistakes. From beginners to intermediate players, these errors cost points and games. Learn what to avoid and how to improve.
Common Cribbage Mistakes: 15 Errors That Cost You Games
Even experienced cribbage players make costly mistakes. Identifying your weaknesses is the first step to improving. This guide covers the 15 most common errors—from beginner blunders to subtle leaks that affect intermediate players.
Beginner Mistakes (1-5)
Mistake #1: Throwing 5s to Opponent’s Crib
The Error: Discarding a 5 to your opponent’s crib because “it’s just one card.”
Why It’s Costly:
- The 5 combines with 16 cards (10, J, Q, K) for fifteen-2
- Expected value of 5 to opponent’s crib: +2.5 points vs. non-5
- That’s essentially giving them 2-3 free points
The Fix: Never discard a 5 to opponent’s crib unless your only alternative is worse (like 5-5 to them when you’re holding 5-5-5-K).
Safe Alternatives: A-K, 2-9, 3-8, 4-7 (wide separation, no fifteen potential)
Mistake #2: Forgetting What’s in the Crib
The Error: Discarding without considering whether you’ve already helped the crib (yours or opponent’s).
Why It’s Costly:
- Touching cards compound (6-7 to crib + later 4-5 = potential run)
- Cards summing to 5 or 15 multiply
- Pairs are dangerous to opponent’s crib
The Fix:
- As dealer: Actively remember what you put in your crib; cut cards can boost it
- As pone: Spread your discards (A-K, 2-9) to minimize combinations
Mistake #3: Always Leading High Cards
The Error: Starting pegging with 10-value cards or other high cards.
Why It’s Costly:
- High lead invites opponent’s 5 for fifteen-2
- Commits your best scoring cards early
- Gives opponent easier path to 31
The Fix: Lead low (ideally 4). The 4 cannot be combined with any single card for 15. It’s the safest opening lead in cribbage.
Mistake #4: Miscounting Fifteens
The Error: Missing fifteens, especially three-card and four-card combinations.
Why It’s Costly:
- Each missed fifteen = 2 lost points
- In muggins play, opponent claims them
- Over time, this costs 10+ points per session
Common Missed Fifteens:
- 4-5-6 (low run)
- 3-5-7 (scattered)
- 2-6-7 (non-obvious)
- 2-4-4-5 (four-card)
- A-2-3-9 (four-card)
The Fix: Count systematically. After obvious fifteens (5+10), check: “Are there any three-card fifteens? Any four-card?” Then add all five card values—if near a multiple of 15, look harder.
Mistake #5: Not Understanding Card Order in Runs
The Error: Thinking cards must be played in sequence to score a run.
Why It’s Costly:
- You miss runs because you don’t see them
- You create runs for opponent without realizing
Example:
- Opponent plays 5
- You play 7
- Opponent plays 6
- That’s a run of 3 for opponent (5-6-7 regardless of play order)!
The Fix: During pegging, mentally track ALL cards played. Order doesn’t matter for runs—only that the sequence exists.
Intermediate Mistakes (6-10)
Mistake #6: Ignoring Board Position
The Error: Playing the same strategy regardless of score.
Why It’s Costly:
- When ahead, aggressive play lets opponent back in
- When behind, safe play guarantees loss
- You’re not adapting to win conditions
The Fix:
| Position | Adjustment |
|---|---|
| 10+ ahead | Defensive crib discards, safe pegging |
| Even | Standard optimal play |
| 10+ behind | Aggressive crib feeding, risky pegging |
Read our full guide on Defensive vs Offensive Strategy.
Mistake #7: Overvaluing Cut Potential
The Error: Keeping a hand that’s great with one specific cut but weak otherwise.
Why It’s Costly:
- That “perfect cut” comes 1 in 13 times
- You sacrifice guaranteed points for unlikely bonuses
- Average expected value suffers
Example: Dealt 4-5-5-7-8-K.
| Keep | Floor | Ceiling | Probability of 14+ |
|---|---|---|---|
| 5-5-7-8 | 8 | 24 (if 6 cut) | ~9% |
| 4-5-5-7 | 6 | 16 (if 6 cut) | ~17% |
The 5-5-7-8 hand has higher ceiling but waiting for a 6 specifically is high-risk.
The Fix: Calculate expected value across ALL possible cuts, not just the dream cut. Sometimes the boring reliable hand wins more often.
Mistake #8: Poor Crib Defense as Pone
The Error: Throwing convenient cards rather than safe cards to opponent’s crib.
Why It’s Costly:
- Touching cards (6-7, 7-8) enable runs
- Cards summing to 5 or 15 multiply scoring
- Pairs give guaranteed 2 points
The Fix:
- Safe: A-K, 2-9, A-8, 2-Q (wide, no 15, no touching)
- Dangerous: 6-7, 5-K, 3-2, 7-8 (combinations everywhere)
Your goal as pone: Give opponent ZERO points in their crib when possible, average 2-3 at worst.
Mistake #9: Automatic Pairing During Pegging
The Error: Always pairing opponent’s card without thinking.
Why It’s Costly:
- Opponent may have the third card for pair royal (6 points!)
- You score 2 but risk losing 6
- Board position might not justify the risk
The Fix: Before pairing, ask:
- “Could opponent have the third card?”
- “What’s my board position?”
- “Do I need these 2 points desperately?”
When significantly ahead, avoid pairing. When behind, pair more liberally.
Mistake #10: Neglecting Nobs
The Error: Forgetting to check if your Jack matches the starter suit.
Why It’s Costly:
- One point seems small
- But 1 point × many games = significant edge
- In muggins, opponent claims YOUR nobs
The Fix: Make it automatic. After counting fifteens-pairs-runs-flush, eyes go to:
- “Do I have a Jack?”
- “What suit is the starter?”
- “Match = 1 point”
Advanced Mistakes (11-15)
Mistake #11: Wrong Pegging Pace
The Error: Playing too fast or too slow during pegging.
Why It’s Costly:
- Too fast: Make mechanical errors, miss opportunities
- Too slow: Fatigue yourself, annoy opponents, time pressure in tournaments
The Fix: Play at a steady, moderate pace. Pause briefly on critical decisions (within 5 of 31, pairs available), but don’t overthink routine plays.
Mistake #12: Not Tracking Discards
The Error: Forgetting what you threw to the crib during pegging.
Why It’s Costly:
- You threw a 5 to your crib → opponent probably has fewer 10s
- You threw K-K → opponent likely has more face cards
- This information affects pegging reads
The Fix: Mentally note: “I threw X-Y to crib.” Use this to adjust expectations:
- Threw 5-6 to your crib? Opponent less likely to have 5s and 6s.
- Threw Q-K to opponent? They might hold 5-5 now.
Mistake #13: Failing to Count Opponent Out
The Error: Not tracking whether opponent is about to win.
Why It’s Costly:
- You peg aggressively when they need 3 points
- You give them an easy 31 when they’re at 118
- You lose games you should have won
The Fix: Always know opponent’s score. When they’re within ~15 points of 121:
- Calculate: “Can they peg out before I count?”
- Adjust: Defensive pegging if they’re close
- Accept: Sometimes they’ll count out anyway—focus on what you control
Mistake #14: Misunderstanding Muggins
The Error: Not calling muggins on opponent’s miscounts (in muggins games), or claiming wrong amounts.
Why It’s Costly:
- Opponent miscounts by 2? That’s YOUR 2 points
- Over many hands, muggins adds up
- In tournaments, muggins is mandatory
The Fix:
- Learn common miscounts (missed fifteens, pair royals counted as 4)
- Pay attention to opponent’s counting
- Say “muggins” BEFORE they start their next play
- Claim the CORRECT amount (don’t over-claim)
Mistake #15: Emotional Play
The Error: Tilting after bad cuts, opponent luck, or losing streaks.
Why It’s Costly:
- Frustration leads to rushed decisions
- You abandon strategy for “gambling”
- Opponents sense weakness and capitalize
The Fix:
- Accept variance: ~30% of cribbage is luck
- Focus on process, not outcomes
- Take a breath before discarding after a frustrating hand
- Remember: Optimal play wins over time
Self-Assessment: Which Mistakes Apply to You?
Beginner Level (Fix These First)
- I sometimes throw 5s to opponent’s crib
- I don’t always lead low cards
- I miss fifteens when counting
Intermediate Level (Work on These Next)
- I play the same regardless of score
- I chase “perfect cut” hands
- I automatically pair during pegging
Advanced Level (Fine-Tune These)
- I don’t track my discards for reads
- I forget to check opponents’ peg-out potential
- I play emotionally after bad luck
How to Improve
Step 1: Choose One Mistake
Don’t fix everything at once. Pick your biggest leak and focus on it for 10 games.
Step 2: Play Consciously
Every hand, remind yourself of the specific mistake you’re avoiding.
Step 3: Track Results
Note when you successfully avoid the mistake and when you slip. Pattern recognition helps.
Step 4: Graduate and Move On
Once a mistake is rare, tackle the next one.
Every cribbage master was once a beginner who made all these mistakes. The difference is: they identified them and systematically improved. Now it’s your turn.
For foundational strategy, see our Beginner Strategy Guide. Ready for more depth? Try our Intermediate Strategy or Discard Strategy guides.
The fastest fix? Play a free game now — mistakes are cheapest when there’s nothing on the line.