Backdoor Triggers and Backdoor Plays in Basketball

Six backdoor triggers seen across offenses, from the overplay and dribble-at to the pass fake and spin dribble, plus the decoys and backdoor plays built on them.

Backdoor triggers are the cues that send a cutter behind his defender, and this guide covers six triggers that show up across these offenses, the decoys that manufacture an overplay, and the named backdoor plays, from the UCLA play to out-of-bounds and after-timeout sets.

Backdoor triggers are the cues that tell a cutter to go behind his defender: an overplay, a turned head, a teammate dribbling at him, a pass fake, a catch at the high post, a spin dribble. The read itself, how a cutter knows he is overplayed and how he finishes the backdoor cut, has its own page. This page covers what calls the cut. It lays out six triggers that show up across these offenses, the decoys offenses use to make a defender jump, and the backdoor plays built on top of them, with the Princeton sets first and the rest of the game after.

A backdoor play sells the defender something he wants to stop, then cuts behind him when he jumps. The read itself needs no setup: when closely guarded, go back door.

What a Backdoor Trigger Is

Pete Carril's rule was "When closely guarded, go back door." That rule is a read, and the Princeton offense treats it as automatic. Coaches also build plays that call it on purpose. A trigger is whatever starts the cut. Some triggers are things the defense does, like a denial or a turned head. Others are things the offense does to signal the cut, like a dribble at a teammate or a spin dribble. John Beilein names the two kinds sudden and signaled, and the sudden kind is covered on the backdoor cut page.

Two of Princeton's numbered rules sit under every trigger: go backdoor at once if overplayed, and do the opposite of what the defense does. Another rule ranks the shots: layups, then threes.

The Six Backdoor Triggers

Trigger	Who starts it	What the cutter sees
1. Overplay	The defense	His defender denies the pass one pass away
2. Head turn	The defense	His defender glances away toward the ball
3. Dribble-at	The offense	A teammate dribbles straight at him
4. Pass fake	The offense	The passer fakes the pass and the defender jumps it
5. High-post catch	The offense	The ball goes to the post at the elbow or the top of the key
6. Spin or reverse dribble	The offense	The ball handler spins or reverses toward him

1. The overplay. A denial one pass away sends the cutter behind his defender, and the tests for when a defender counts as overplaying are on the backdoor cut page.

2. The head turn. One Princeton version also sends the cutter when his defender glances away toward the ball, a test laid out with the others on the backdoor cut page.

3. The dribble-at. Princeton's rule sheet and Jay Wright both make a dribble-at on a tightly guarded player an automatic backdoor, and the one-second hold, the sag answer and the hand-off-or-back-cut split are on the backdoor cut page.

Dribble hand-off that turns into a backdoor lob when the defender cheats the hand-off

Hand-off into a lob. 1 takes two hard dribbles at 2 on the right wing and jump-stops for the hand-off. X2 cheats the hand-off, so 2 cuts backdoor and 1 lobs the ball to him for the catch before the rim.

Jay Wright's hand-off turns the same moment into a lob. His hand-off is two hard dribbles and a jump stop, with the ball put on a plate for the cutter to take. If the defense cheats the hand-off and takes it away, it becomes an automatic lob to the cutter. His teaching point is that the cutter has to have the ball in his hands before he reaches the rim, and the pass goes right over the defender's head. More on the hand-off is on DHO basketball.

4. The pass fake. A pass fake makes a denying defender commit. In one motion version, a receiver who gets a pass fake back cuts at once. Princeton sets use it to sell the cut in the middle of an action.

Backdoor cut off a pass fake from the top of the key with the post popping to the corner

Pass fake into the backdoor. 5 has the ball at the top of the key. 2 pops from the left block to the left corner, 5 fakes a pass to 3 on the left wing, and 3 cuts backdoor to the rim for 5's pass.

This is the end of Chin High, where the pass fake is written into the play to sell the cut. The same fake can mean the opposite in another set. In a Chin counter, the guard's pass fake to the forward signals the post to come set a ball screen. A team has to know which one its fake means. The full Chin High sequence is on Princeton Chin series.

5. The high-post catch. In the Point series, the passer's fake screens send the corner player or the far wing backdoor off the post catch. In John Beilein's two-guard Chin, when the flashing post catches, both guards sprint backdoor at once, as a sprint and not a read. In Carril's Chin, a center whose defender denies him at the high post goes backdoor himself. Another version calls the guard-to-post pass at the elbow its richest entry, and the post's first look after he catches and protects the ball is the ball-side wing going backdoor. The Point cuts are on Princeton Point series.

6. The spin or reverse dribble. The signaled trigger, covered next.

The Spin Dribble and Other Signals

A signal turns the backdoor into a called play the defense cannot read. The signals in use:

Dribble away and spin back. Beilein's signaled backdoor. The passer dribbles away from the cutter and spins back to make the passing angle.
Spin dribble at the top. In the Point series, a denied pass to the high post keys a spin dribble by the guard, and the far wing cuts hard backdoor. If he is not open, he reverse pivots into the post.
Hard reverse dribble. One Princeton teaching version makes a hard reverse dribble toward a player his cue to go backdoor.
The driver's jump stop. In Vance Walberg's dribble drive, a driver who jump-stops in the drop zone signals the back cut. The cut is drawn on dribble drive motion offense, and the drop zone on dribble drive zones.
The cutter's jump stop. The cutter jump-stops and pivots to tell the passer he is going.

The best-known spin-dribble backdoor is the UCLA play. The play is drawn under UCLA's name and captioned as the backdoor that beat defending champion UCLA 43-41 in 1996.

Backdoor play off a spin dribble at the high post with a decoy double screen on the far elbow and a baseline cut

The UCLA play. 5 has the ball at the right elbow. 1 and 4 set a double screen at the left elbow and 2 comes up off it from the left corner. 5 dribbles toward the top of the key and spins back, and 3 cuts from the right corner along the baseline to the rim for 5's pass.

It starts with a spin dribble by the 1, the 5 filling the high post to catch, and the 3 filling the corner. On the catch, the 3 cuts along the baseline at about half speed to set up the real cut, and the 1 and the 4 set a double screen at the far elbow for the 2. That screen is a distraction. As the 2 comes off it, he pulls the weak-side help away from the basket. The 5 sells the action by dribbling toward the top of the key, then spin-dribbles back toward the 3, who cuts hard to the rim for the layup.

Making the Defender Jump

A backdoor play manufactures the overplay with misdirection first, a zipper, a hand-off, a stagger, a ball screen, a UCLA cut, a drag, a flare or Spain action, then cuts when the defender jumps the fake. In a called backdoor play, there is no backdoor without the setup. The ways teams sell it:

A decoy screen. The double screen in the UCLA play, a fake screen by the passer in the Point series, or a fake screen that holds the help while an athlete backdoors.
A repeated action. A set run several times before its backdoor counter is subbed in, so the defender has learned to jump it. The Boston Celtics ran their transition action this way. In Princeton's Circle, the guards return high off down screens until the defense starts to cheat up.
A normal cut first. The San Antonio Spurs' zipper backdoor from the 2015 playoffs walks the defender up like an ordinary zipper cut before the cutter goes behind him. A misdirection version has the cutter act like he is coming to the top, then reverse pivot for the layup.
A change of speed. The UCLA play's cutter runs the baseline at about half speed before he cuts hard. Another cutter walks his defender up before he goes.
A misleading name. One backdoor play is named so the defense hears it as a call for a corner three.

Backdoor cut by a returning guard when his defender cheats up, with the pass from the post at the top of the key

Circle overplay. 5 has the ball at the top of the key and the guards are coming back up beside him. X2 cheats up to beat 2 there, so 2 cuts hard backdoor to the rim and 5 passes to him.

Circle is the repeated-action trigger in a Princeton set. The 1 and the 2 cut to the paint, come back off down screens from the wings set no lower than the free-throw line extended, and return to the guard spots beside the 5. After it has run a few times, the defense tends to cheat up and overplay the guards coming back high, and the overplayed guard back cuts hard, with the 5 hitting him at the rim. Down screens are covered on down screen basketball.

Princeton Backdoor Plays

The Princeton offense has backdoors in every set, and several plays exist to call one. Each is named here by what it does.

Play	How the backdoor comes
The UCLA play	Spin dribble, high-post catch, decoy double screen at the far elbow, a spin back to the cutter from the corner
Chin	If the 2 is denied on the swing, the 4 dribbles at him for the backdoor
Chin High	The 3 cuts backdoor for a layup pass from the 5 after a pass fake
Point Over and Away	The passer fakes a screen and the corner player or the far wing backdoors off the post catch
Point spin counter	A denied post keys a spin dribble and the far wing backdoors
Circle	Guards circle back up off down screens, and the one whose defender cheats up backcuts for a pass from the 5
Circle high screen	The 5 sets a ball screen in the middle and does not roll, and the other guard sets his man up and backdoors from the top. It is called against backcourt pressure
Wing shooter play	Starts like Low. The 4 cuts backdoor on the dribble-at by the 3, the 5 flares the 3, and the play resets into Chin
High-post isolation backdoor	The 1 passes to the 5 high and fakes a screen for the 4 cutting backdoor, while the 2 comes off a double screen. The order is the 2 off the screen, then the backdoor, then the 1 one on one on the empty side
Screen-away backdoor	The 2 screens away for the 4, and if the 4's defender cheats, the 4 backdoors

The base system around these is on the Princeton offense hub, and the defensive side, including how teams try to defend the backdoor, is on how to defend the Princeton offense.

Backdoor Plays From Other Systems

Backdoor plays come in two build types. Unscreened sets sell the cut with a fake and need no teammate. Screened sets give the cutter a back screen so the cut is tighter. Beilein teaches the screened cut chest to chest with the post so the trailing defender cannot follow.

Play	Alignment	How the backdoor comes
Dean Smith's box backdoor	Box	The back cutter fakes toward the wing first. It was built against teams that deny the leading scorer
Tom Izzo's scissors backdoor	Box	A scissors screen, then the 2 fakes and back cuts
Larry Brown's zipper series	Zipper start	Every play starts with the same pin down and dribble out, then ends in a hand-off, a flex cut, a backdoor, a clear-out or a lob
1-4 high split backdoor	1-4 high	The 2 chooses between the backdoor and the screen
Baseline screen backdoor	3-out 2-in or 1-3-1	The low post sprints along the baseline to screen the far wing, who cuts backdoor for the high post's pass. If the defense switches, the post seals and cuts
Back screen lob and its sister	Half court	The post back-screens for a lob, timed until the guard clears another screen. The sister play runs the same action with a down screen for a three
Belmont's backdoor series	Ten base sets	A 20-play series that pairs a backdoor with each base look, from Horns and Stack to Delay and Weave
Spain backdoor	High ball screen	A high ball screen with a Spain re-screen into a fake hand-off. The defender commits to the hand-off and the cutter goes

Pairing a backdoor with every base set is the idea behind Belmont's series, and other programs tag one onto a continuity. In a flex offense, the backdoor against denial is the main pressure release, and one version replaces a flex down screen with a straight cut that catches teams who never expect a backdoor from the flex. The flex version is on flex offense basketball, and quick hitters in general are on how to run quick hitters.

Out of Bounds, After Timeouts and Junk Defenses

The same cut works from a dead ball, where the defense is set and often denying hard.

Baseline out of bounds. Belmont runs a backdoor off its baseline sets, and the dribble drive drop series is suggested for baseline and sideline plays against hard overplays. More sets are on baseline out of bounds plays.
Sideline out of bounds. A box sideline play inbounds with the best guard so the back-screen return pass is his, with the screener sealing and rolling as the second option. More are on sideline out of bounds plays.
After a timeout. Butler labels its Chin backdoor for after a timeout, and UConn carries a delay backdoor marked the same way. Keeping a backdoor on the after-timeout card is covered on basketball after timeout plays.
Box and one. The wing cuts backdoor the instant the post's own defender steps over to help. Other answers to junk defenses are on how to beat a box and 1.

Building a Backdoor Play

The plays above share a few design rules.

Empty the lane. Start from a double gap, two empty spots between the cutter and the ball, so no helper is waiting at the rim.
Trigger on a defensive event, not a count. In Chin the cutter waits until the ball leaves the passer. Beilein never cuts early, because the cutter times the pass, not the motion. The box and one set cuts on the helper's first step.
One start, several endings. Sister plays change one variable.
Plan the exit. The box backdoor sets add a rule. If the pass is not there, do not throw it, and flow into the base offense. Princeton's wing shooter play resets into Chin.
Posts go backdoor too. A high post who pops out after a UCLA cut and is overplayed can go backdoor for a lob, and a wing who misses the backdoor can reverse pivot into the post.

Drill the Trigger First

A play that calls a backdoor needs players who already make the cut. A three-line drill rehearses the dribble-at back cut with bounce passes, then air passes, then left-handed layups. A Princeton two-on-zero drill runs the dribble-at from two spots on the floor with a bounce pass that leads the cutter and a straight-line cut. A ten-practice Princeton plan teaches the backdoor read on the third day and scores a backdoor layup off a denial as two points in the closing scrimmage. More drills are on drills to teach the Princeton offense, and cutting in general is on cutting in basketball.

Questions Coaches Ask About Backdoor Triggers

What triggers a backdoor cut?

Six cues show up across these offenses: an overplay, a defender turning his head, a teammate dribbling at the cutter, a pass fake, a catch at the high post, and a spin or reverse dribble used as a signal.

What is a backdoor play in basketball?

A called play whose payoff is a backdoor cut to the rim. It sells the defender a fake first, a screen, a hand-off or a cut he expects, and then sends the cutter behind him when he jumps it.

What play did Princeton run to beat UCLA?

The play drawn under UCLA's name is a spin-dribble backdoor, captioned as the one that beat defending champion UCLA 43-41 in 1996. The post catches at the high post, a double screen at the far elbow pulls the help away, the post dribbles toward the top and spins back, and the corner player cuts hard to the rim.

Should a player cut backdoor when dribbled at?

In Princeton's rules and Jay Wright's, yes, when he is played tight. Some offenses use the dribble-at for a hand-off instead and make the back cut the answer when the defense jumps it.

How do you run a backdoor against a sagging defense?

The backdoor closes when the defender sags. Princeton versions answer with a flare for the player being dribbled at, or a down screen for a shooter, and keep the backdoor for the defender who denies.

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