Slam Try

Splinter Bids

Double-jump shifts show a game-forcing major raise with a singleton or void in the bid suit.

What Is a Splinter Bid?

Three Messages in One Bid

A splinter bid is a double jump in a new suit that simultaneously communicates three pieces of information: game-forcing values (typically 11–14 HCP with good shape, or 11+ with a void), four or more cards in support of partner's suit, and a singleton or void in the suit actually bid. For example, after a 1♥ opening, a jump to 4♦ by responder is not a preempt or a natural diamond bid — it is a splinter, promising heart support, game-forcing strength, and a short diamond holding. All three messages arrive simultaneously, giving opener a rich picture of the combined hands with a single call.

How Opener Evaluates the Splinter

The great power of splinters lies in opener's ability to revalue their hand in light of the known shortness. The key principle is simple: honor cards in the splinter suit become wasteful. If opener holds KQ5 in the suit partner has splintred in, those honors face a singleton or void — they are almost certainly not contributing tricks. By contrast, a holding of small doubletons or a stiff in that suit means opener's honors elsewhere work at full value and the partnership fits beautifully. The decision rule is elegant: count wasted honors in the short suit, and sign off in game if you find them; cuebid or use RKCB if you don't.

Splinters vs. Jacoby 2NT

Both Jacoby 2NT and splinters are game-forcing major raises, but they operate differently. Jacoby 2NT asks opener to describe shortness; the splinter shows shortness and asks opener to evaluate. With a hand that has clear shortness and game-forcing values, the splinter is generally more efficient — it narrows the slam-going decision to a single question about wasted cards. Jacoby 2NT is better when you want opener's full picture before committing to a strain or when you have extra values (15+ HCP) where cue-bidding after Jacoby provides more precision.

Distinguishing Splinters from Natural Double Jumps

In standard methods, a double jump in a new suit after a one-level opening was traditionally played as natural and preemptive or strong — the exact meaning varied widely. Modern partnerships who play splinters must explicitly agree to this treatment and alert it at the table. The partnership understanding must be clear: a double jump by a previously-unpassed responder in a new suit after a major opening is a splinter. Without that agreement, partner may misread the auction entirely, leading to misbid slams or missed games.

Core Rules

Alert Required: Splinter bids are conventional and must be alerted in duplicate bridge. Make sure your partner knows you play splinters before the round begins.

Identifying Splinter Bids

OpeningSplinter BidMeaning
1♥3♠Short spades, 4+ heart support, GF (11–14 HCP)
1♥4♣Short clubs, 4+ heart support, GF
1♥4♦Short diamonds, 4+ heart support, GF
1♠4♣Short clubs, 4+ spade support, GF
1♠4♦Short diamonds, 4+ spade support, GF
1♠4♥Short hearts, 4+ spade support, GF

Point Count and Hand Requirements

The standard splinter range is 11–14 HCP with a singleton, or 11+ HCP with a void (which effectively adds 2–3 dummy points). With more (15+ HCP), the hand is better explored via Jacoby 2NT followed by cue-bids, or by going straight to RKCB — the auction benefits from the additional precision those methods provide. The four-card trump support requirement is traditional; some experienced partnerships allow a three-card splinter with extreme distribution, but this must be discussed.

Opener's Evaluation After a Splinter

Opener's holding in splinter suitAssessmentAction
KQx or KQxxMaximum waste — two honors facing a void or singletonSign off in 4 of the major
KxxPartial waste — the K is valueless if partner is void; useful if singletonLean toward signing off; evaluate rest of hand
AxExcellent — the Ace wins a trick regardless of short suitSlam try: cue-bid or 4NT
xx or xxxNo waste — small cards opposite a void/singleton = no losersStrong slam try
VoidDouble void / double fit possibleAggressive cue-bid; potential grand slam
Slam Formula: No wasted honors in the short suit + good trumps + side suit controls = slam is likely. Even one wasted honor (a K or Q facing the shortness) is often enough to kill slam prospects.

Continuing the Auction After a Splinter

Once opener evaluates, the auction can go several ways. Signing off in 4 of the agreed major ends the auction with no slam interest. A cue-bid in a new suit shows first-round control (ace or void) and slam interest. Bidding 4NT (RKCB) asks for keycards directly. Responder who hears a sign-off should pass; if responder made a minimum splinter with the wrong shape for slam opposite that sign-off, the sign-off at game is the correct final contract.

Decision Tree

Use this tree to decide whether to splinter, and how to respond when partner splinters.

Partner opens 1♠ (or 1♥). I have 4+ trumps and GF values (11+ HCP). Do I have a singleton or void in a side suit?
▶ No shortness — Bid Jacoby 2NT (shows 4+ support, GF, any distribution).
▶ Yes, I have shortness — Is my HCP range 11–14?
▶ 15+ HCP — Too strong for a splinter. Use Jacoby 2NT then cue-bid, or go directly to RKCB. Splinter understates your values.
▶ 11–14 HCP with shortness — Make the double jump in the short suit (splinter).
Partner has made a splinter (e.g., 1♥ – 4♦). I am opener. What do I hold in the splinter suit (diamonds)?
▶ I hold KQx, KJx, or Qxx in the splinter suit — wasted honors
▶ Sign off in 4♥. Do not try for slam — your HCP are largely wasted opposite partner's shortness.
▶ I hold Ax, xx, or a void in the splinter suit — no waste
▶ Do I have good controls elsewhere?
▶ Yes — Cue-bid the cheapest first-round control (ace or void) to show slam interest.
▶ Enough to ask directly — Bid 4NT (RKCB) to count keycards.
▶ Still uncertain — Sign off in 4♥ and let responder re-evaluate with a correction if appropriate.
▶ I hold a void in the splinter suit (double-void position)
▶ Potential grand slam. Cue-bid aggressively; use RKCB and then 5NT to check for specific kings. Both hands have eliminated losers in that suit entirely.

Quiz

Test your splinter bid knowledge. Click an answer to see the explanation.

Q1: Partner opens 1♥. What is your call?
♠ 5   ♥ K Q 7 6   ♦ A J 5 4   ♣ K J 6 5   (13 HCP, singleton ♠)
Correct: a — 3♠ (splinter). This is a textbook splinter: 13 HCP, four-card heart support, singleton spade, and game-forcing values. The double jump to 3♠ communicates all three facts simultaneously. Option (c) Jacoby 2NT is also game-forcing and supportive, but it does not tell opener where the shortness lies — opener then has to describe their hand rather than evaluate yours. The splinter is more direct. With this hand, you want opener to evaluate whether their spade honors are wasted, and 3♠ achieves that perfectly.
Q2: You open 1♠. Partner bids 4♦ (splinter — singleton/void diamonds, 4+ spades, GF). What is your best action?
♠ A K J 7 6   ♥ K J 4   ♦ Q 6 5   ♣ A 4   (16 HCP)
Correct: a — 4♠. Your ♦Q65 is the problem. Partner has a singleton or void in diamonds, which means your queen and the fifth card are facing 0–1 cards in partner's hand. The ♦Q is almost certainly drawing no tricks — it is a wasted honor. Despite the strong overall hand, the diamond holding forces a sign-off. The ♥KJ4 is fine (good controls), but the diamond waste more than offsets the positives. A disciplined sign-off in 4♠ is correct.
Q3: Same auction — 1♠ – 4♦ (splinter). Now opener's hand is different. What is your best action?
♠ A K J 7 6   ♥ K J 4   ♦ 5 4   ♣ A K Q   (19 HCP)
Correct: a — 4NT (RKCB). This time your diamond holding is ♦54 — two small cards. There is zero waste in the splinter suit. Your ♣AKQ and ♠AK give you four keycards already (♠A, ♠K as trump king, ♣A... wait — the five keycards are the four aces plus the ♠K). You hold ♠A, ♠K, ♣A = 3 keycards. Partner has GF values and 4+ spades. With no wasted diamonds and a dominant holding elsewhere, using RKCB is ideal — find out how many keycards partner has to determine whether 6♠ or even 7♠ is on. A direct 6♠ risks missing a grand; 4♠ wastes a slam.
Q4: Can a splinter bid show a void rather than a singleton?
Consider: you hold ♠— ♥KQ76 ♦AJ54 ♣KJ65. Partner opens 1♥.
Correct: b. A splinter bid shows 0 or 1 card in the bid suit — both a singleton and a void qualify. With the hand shown, a void in spades is perfect for a splinter: bid 3♠ over 1♥. Partner will evaluate their spade holding against a void, which is even better than a singleton for the partnership's combined trick-taking power (no losers in that suit at all). The splinter description of "singleton or void" is standard; the void is simply the better end of the range.

Hand Examples

Example 1: Splinter Helps Avoid a Bad Slam

The splinter works best as a slam-stopper when opener holds wasted honors in the short suit.

North (Opener)
♠ A K J 7 5
♥ 4 3
♦ K Q 6
♣ A Q 5
17 HCP — opens 1♠
South (Responder)
♠ Q 9 6 2
♥ K Q 8 7
♦ 5
♣ K J 4 3
12 HCP, singleton ♦ — splinters 4♦
NorthSouthNotes
1♠4♦Splinter: singleton diamond, 4+ spades, GF
4♠PassNorth holds ♦KQ6 — maximum waste. Sign off.

North's ♦KQ6 are almost worthless facing South's singleton diamond. 6♠ would require both the ♥A and perfect breaks — it is a poor contract. With Jacoby 2NT, South would have heard about opener's heart shortness or minor length, but not learned that the diamond honors are wasted. The splinter allows North to make the correct evaluation in one bid. At other tables, pairs without splinters might stumble into 6♠ on combined 29 HCP and go down when the ♥A is offside.

Example 2: Splinter Finds a Grand Slam

When opener has no waste in the splinter suit, the slam search accelerates dramatically.

North (Opener)
♠ A K J 8 5
♥ A Q 6
♦ 7 4
♣ A K 5
20 HCP — opens 1♠
South (Responder)
♠ Q 9 7 3
♥ K J 5 4
♦ —
♣ Q J 6 4
11 HCP + void ♦ — splinters 4♦
NorthSouthNotes
1♠4♦Splinter: void/singleton diamond, 4+ spades, GF
4NT5♦RKCB (1430): 5♦ = 0 or 3 keycards. South has 0 (♠Q is not a keycard; South holds no aces or the ♠K). North holds ♠A, ♠K (trump king), ♥A, ♣A = 4 keycards. 4+0=4 or 4+3=7 (impossible). So South has 0 keycards.
5NT6♣5NT asks for kings (all 5 keycards present? North re-checks: has 4, South 0 = combined 4, not 5. In practice North sees 4 keycards and South's ♠Q and voids suggest grand possibilities. With 20 HCP + void + strong trumps, North makes the practical slam try.
6♠PassNorth settles for 6♠. The void in diamonds means no losers there; combined 31 HCP with double fits make 6♠ laydown.

Key Point: North's ♦74 is perfect opposite South's void — zero wasted cards in diamonds. The immediate RKCB response after the splinter signals a powerful slam try. Even without all five keycards, the double-fit nature of this hand (spades + clubs) makes 6♠ an excellent contract.

Common Misunderstandings

Misunderstanding 1: "I thought the double jump was natural or preemptive."

In older standard methods, a double jump in a new suit (e.g., 1♥ – 4♦) might have been played as a strong jump shift, a preemptive raise, or even a natural diamond bid. Modern partnerships who play splinters must explicitly agree and alert. Without that agreement, partner may pass thinking you have a natural diamond suit — a catastrophic misunderstanding. Fix: Discuss splinters explicitly before every session. Mark them on your convention card and alert every splinter bid at the table. Do not assume partner knows.

Misunderstanding 2: "I splinter with three-card support."

Traditional splinters require four-card support. Making a splinter with only three trumps misleads partner about the combined trump length and may cause opener to commit to a slam with inadequate trumps. Some expert partnerships extend splinters to three-card suits with extra distribution (e.g., 7-3-1-2 shapes), but this requires an explicit agreement. Fix: Unless you have an explicit partnership agreement otherwise, require four-card trump support to splinter. Three-card GF raises should go through Jacoby 2NT or a 2/1 response instead.

Misunderstanding 3: "Opener can't invite after a splinter — it's either slam or no slam."

While it is true that responder has already established a game-force, opener is not locked into a binary decision. Opener can make a slam try via a cue-bid of a first-round control, or proceed to RKCB. Signing off in 4 of the major simply ends the auction; it does not prevent responder from taking further action if responder holds extra values or a void. The auction remains cooperative. Fix: Opener should treat the splinter as opening a dialogue about slam. Cue-bid good holdings; sign off with wasted cards. Responder may correct a sign-off with extraordinary values.

Misunderstanding 4: "Ax in the splinter suit is wasted because the ace is only one trick."

This is backwards. The ace in the splinter suit is not wasted — it is a winner regardless of how short partner is in that suit. The waste happens with secondary honors: kings and queens that need partner to have cards in the suit to take tricks. An Ax holding in the splinter suit means you have a sure trick and no lower-honor waste. Fix: Evaluate only the K, Q, and J in the splinter suit as potential waste. The ace always wins a trick and is never wasted. Ax = excellent; Kxx = wasted.

Practice Sequences

Study these six auction types to build confidence with splinters in live play.

Sequence 1: Splinter Then Sign Off (Wasted Honors)

WestNorthEastSouth
—1♥Pass4♣
Pass4♥PassPass
South splinters 4♣ (singleton/void clubs, 4+ hearts, GF). North holds ♣KQ4 — two wasted honors in the short suit. North signs off in 4♥. South, who already showed the extent of their hand, passes.

Sequence 2: Splinter Then Slam (No Waste, Cue-bid)

WestNorthEastSouth
—1♠Pass4♥
Pass4NTPass5♦
Pass6♠PassPass
South splinters 4♥ (singleton/void hearts, 4+ spades, GF). North holds ♥54 — no waste. North goes directly to RKCB. 5♦ = 0 or 3 keycards; North deduces 3 (partner's strong hand). Combined 4+ keycards — North bids 6♠.

Sequence 3: Splinter With a Void (Void Splinter)

WestNorthEastSouth
—1♥Pass4♦
Pass4♠Pass4NT
Pass5♣Pass6♥
South splinters 4♦ (void in diamonds, 4+ hearts, GF). North cue-bids 4♠ (♠A control) — no diamond waste. South, holding extra values, uses RKCB. 5♣ = 1 or 4 keycards; South deduces 4. Combined keycards adequate for 6♥.

Sequence 4: Jacoby 2NT vs. Splinter Choice

WestNorthEastSouth
—1♠Pass2NT
Pass4♦Pass4NT
Pass5♦Pass6♠
South has 4+ spades, GF values, but no clear singleton — uses Jacoby 2NT. North shows a diamond splinter (4♦ = singleton/void diamond). South re-evaluates: diamond holding is ♦AJ — the Ace is fine, no waste. South uses RKCB; all keycards present; bids 6♠.

Sequence 5: Opener's Evaluation — Partial Waste

WestNorthEastSouth
—1♥Pass3♠
Pass4♣Pass4NT
Pass5♥PassPass
South splinters 3♠ (singleton/void spades). North holds ♠Kxx — partially wasted (the K faces a singleton or void). North makes a mild try by cue-bidding 4♣ (club control). South with minimum splinter uses RKCB. 5♥ = 2 keycards no trump queen. South signs off in 5♥.

Sequence 6: Grand Slam Try After Splinter

WestNorthEastSouth
—1♠Pass4♣
Pass4NTPass5♥
Pass5NTPass6♦
Pass7♠PassPass
South splinters 4♣ (short clubs). North has ♣54 — no waste — bids RKCB. 5♥ = 2 keycards no trump queen. North holds 3 keycards = combined 5 of 5. 5NT asks for specific kings. 6♦ = king of diamonds. North can count 13 tricks and bids 7♠.

Expert Mistakes

Expert Mistake 1: Splantering With 15+ HCP

A splinter bid carries an implicit message about hand strength: 11–14 HCP. When an expert has 15+ HCP and makes a splinter, they are effectively hiding values from partner. Opener may sign off with "wasted" honors and miss a laydown slam, because responder's extra values could compensate for the wasted holding. For example, with ♠AKQ54 as opener opposite a splinter responder holding 16 HCP, the combined 33+ HCP might make slam good regardless of diamond waste — but opener doesn't know about the extra values.

Fix: With 15+ HCP and support, use Jacoby 2NT and then cue-bid shortness on the next round. This allows a more precise exchange of information. Reserve splinters for the 11–14 HCP range.

Expert Mistake 2: Failing to Alert the Splinter Bid

Splinter bids are conventional and must be alerted in duplicate bridge. Even experienced players sometimes forget to alert, particularly when they are focused on the hand evaluation. Failing to alert deprives the opponents of their right to know the conventional meaning, which is both a procedural infraction and potentially gives an unintended advantage.

Fix: Make alerting a reflex habit. As soon as partner makes a double jump in a new suit (after suit agreement), alert automatically. If you are the splinterer, remind yourself that it needs alerting even if it feels like a natural hand to you.

Expert Mistake 3: Trying for Slam With Wasted Honors in the Splinter Suit

The most common expert error with splinters is not the signaling side — it is the evaluation side. Opener correctly identifies the wasted honors (e.g., KQx in the splinter suit) but still cuebids or uses RKCB, hoping that the rest of the hand compensates. Sometimes it does, but on average, one wasted honor reduces slam chances materially, and two wasted honors (KQ facing a void) make slam a very poor proposition. Optimistic players who try for slam with maximum waste often find themselves in 6-level contracts requiring favorable layouts.

Fix: Trust the evaluation mechanism. If you hold KQx or Qxx in the splinter suit, sign off in 4 of the major without exception. The system is designed precisely for this: partner told you about the short suit so you can correctly devalue those honors.

Convention Card Notes

Splinter Bids

Double jump in a new suit = singleton or void + 4-card support + GF (11–14 HCP).
Requires prior discussion and alert at the table.

OpeningSplinterShows
1♥3♠Short ♠, 4+ ♥ support, GF
1♥4♣Short ♣, 4+ ♥ support, GF
1♥4♦Short ♦, 4+ ♥ support, GF
1♠4♣Short ♣, 4+ ♠ support, GF
1♠4♦Short ♦, 4+ ♠ support, GF
1♠4♥Short ♥, 4+ ♠ support, GF

Notes:

  • Point range: 11–14 HCP; with 15+ use Jacoby 2NT + cue-bid instead
  • Shows singleton or void (not necessarily singleton only)
  • Requires 4-card trump support (3-card splinter by partnership agreement only)
  • Alert required in all duplicate play
  • Opener evaluates: wasted honors in short suit → sign off in 4M; no waste → cue-bid or 4NT (RKCB)