Play Designed To Deceive An Opponent In A Bridge Game
Source: The Art of False Carding and Deceptive Play in Bridge By Paul Tobias

False Cards are Used By Defenders to
1) Give declarer a choice of how to play a suit when a non-false-card would leave no choice but the one that works for declarer.
2) Confuse declarer as to distribution of suits and high-card placement
3) Create the appearance of a line of play that will be advantageous for declarer that actually leads to trouble or the loss of an extra trick.
4) Steer partner into leading the suit you want led.
False Cards (or Deceptive Plays) are Used By Declarer to
1) Confuse defenders as to distribution of suits.
2) Confuse defenders as to high card placement and strength .
3) Make it hard for defenders to read come-on or length signals.
Note: We will pay special attention to false card plays that should be standard and automatic (sometimes called "Obligatory") but are rarely used by intermediate club players and even many advanced players. These can often pay off in match-point bonuses.
We begin with a few Declarer False Cards – more often called "Deceptive Plays" since declarer has no partner to worry about misleading when playing a card.

At a suit contract West leads the 3 of an unbid suit. How should declarer play?
Declarer knows the lead is almost certainly a singleton. He must do his best to make East think declarer has the singleton and the lead was from 3 to the J. Go up K in dummy and, after the A is played, follow with the 10 (not the J or 9). You want it to look like West led from J93 – a not unlikely possibility. He wouldn't lead the 3 from J103 or 1093, however, which is why you play the 10. Many declarer false cards depend on the signaling methods used by the defense and are aimed at hiding the defenders' true count or strength in a suit.
If West leads the K of the suit shown above (or A, if West leads A from AK). declarer would like him to continue with the A. East plays the 3 (standard signals) and declarer should conceal the 2 and play the 8. West might think East has Q32 and is encouraging continuation. If East/West are playing upside down signals, East still has to play the 3 or possibly give up a trick, so declarer should play the 2 to make it look like East wants a continuation.
At a suit contract, with West having overcalled with the suit shown, the K is led (or A, if West leads A from AK). If East/West play standard carding, East plays the 4 and declarer should follow with the 2 (not the 9!). If East/West play upside down, after East plays the 3, now declarer should play the 9. It may not work – but you at least put West to a guess. Here's a famous declarer deceptive play made long ago by Ely Culbertson.
South opens 1 and ends up in an ambitious 3NT contract. West leads the
5 and East plays the
10. Declarer smoothly wins with the
A!! After a low spade to dummy's Q, a losing diamond finesse was taken. Who could blame West for now under-leading his
K to the
Q he was sure was in partner's hand. However, if declarer had won trick 1 with the
Q, West would very possibly have switched to the game defeating club suit.
Summary for Declarer: Find out about opponents signals and plan your play accordingly, including cards to follow suit with or win with, before playing to trick 1.
False Cards By The Defense
The opportunity for the defense to gain using false cards is much greater than for declarer. The only thing defenders have to be careful about is that they don't deceive their partner when honest strength or count signals are needed (often when declarer runs a long suit and pseudo squeezes the defenders).
We begin with some so-called obligatory false cards. These are "Obligatory" because they do not cost anything and they may gain (no guarantee). The main idea is that in many situations, not following suit with your lowest card can give declarer options to go wrong that he would not have had otherwise. Many involve holdings in a strong suit of declarer's (typically trumps). Key holdings to alert you to a possible obligatory false card are 10x, 109x, J10x, J9xx, K108x or K10x.


Declarer leads low to the J, intending, if it wins, to play the A next and pick up the entire suit whenever the K doubleton is on side. However, under the J, East plays the 10 (or 9). Now, declarer has another option: go back to hand and lead the Q. This picks up the whole suit whenever East has 109 and also protects against 2 losers if East has played a singleton. Even if declarer knows East might be false carding, he is likely to fall for this. Note that playing the 3 first leaves declarer with no choice but to succeed.
Variations: In this example, give East the 8 instead of the 9 and it is still right to play the 8 on the lead to the J. This might make it more likely for declarer to lead the Q the next time the suit is played. And, if the JC is in declarer's hand (along with the 9) and led for the first trick, West should duck and East should play the 8. Declarer will most likely return to hand to lead the J.
This gets tricky for West, however, for if partner has the 109x he has to cover when the J or Q is led by declarer – an example of why defense is so hard in Bridge. Both (1) and (2) are easy to remember and cannot cost. Defenders should make the play of the 10 smoothly, without hesitation (think about it in advance, before declarer plays the suit!).






(9) In the middle game, West has to lead this suit.
West should lead the Q. Declarer will almost always duck (the exception is when West is known to have the A). Next, West leads the 8. Declarer may play him for QJ8(x) and duck in dummy. Presto – the defense takes 3 tricks!


We close this article on defensive false carding with 2 complete hand examples.
and jumping to 2NT over North's 1
bid. North raised to 3NT and West led the
3. It is normal for East, in 3rd hand position, to play her highest card. However, East can see that West has no possible outside entries and puts in the
Q. Declarer, afraid the
AJx lie behind him, must win the
K and hope the heart finesse is on – if so he loses only 3 spades and a diamond based on the 4th best lead of the 3. When the heart finesse loses, declarer goes down 1. If East rose
A at trick 1, declarer would have held up the
K until the 3rd round and made the contract.

and South overcalls 1
and eventually gets to 4
. West leads the 2
and West's play to trick 1 is crucial (underscoring why it is always right to study the hand before playing to trick 1, both as declarer and defender. It is clear to East that the best he can hope for is 1 trick from partner, probably in hearts but perhaps the
K. Also, he won't even get his 2 diamond tricks unless West leads that suit when he gets in. So, East plays the
K on the opening lead – a signal that denies the
Q! When West wins the
A, he knows to lead a diamond and hold the contract to 4, Just for the fun of it, one more example (from a Charles Goren article I read long ago) shows how a declarer can take advantage of deception in a novel way. The details are roughly as shown and this actually happened. Declarer is in a high level contract – possibly a slam. It can only make if the entire spade suit is picked up. Declarer has QJ1097 opposite A3. How would you play the suit? Here's the actual suit layout:
The brilliant expert declarer did not lead the Q (as mere mortals would) hoping for Kx onsides or a foolish cover from 3 or 4 to the K). Instead he made the deceptive lead of the 9. When it went K from West, he reasoned that no one would play the K over the 9 unless forced to and, after winning the A, finessed the 7 on the way back.
References
1. The Official Encyclopedia of Bridge, 7th Edition
2. Play of the Hand, Louis Watson
3. The Rodwell Files, Eric Rodwell & Mark Horton
4. Deadly Defence, Izdebski, Krzemien & Klingerfalse
Play Designed To Deceive An Opponent In A Bridge Game
Source: http://youth.worldbridge.org/the-art-of-false-carding-and-deceptive-play-in-bridge/
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