Declarer Play: Count your tricks and then choose the best option

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Hands where several declarers did not make the most tricks possible. app.pianola.net/Results/Sessi...
You can replay the hands using the links below.
Board 3: tinyurl.com/yxchm4us Of those who played in 3NT, nearly half did not make 9 tricks. (POLL 1 - discard from dummy?)
Board 8 : tinyurl.com/bde4rwhr Only one declarer managed 12 tricks. Only a trump lead should hold declarer to 11 tricks.
Board 13: tinyurl.com/ebpz87hm You should manage 8 tricks if the clubs divide favourably. About half did not make 8 or more tricks. (POLL2)
Boards 18: tinyurl.com/yxf5bw99 No matter how the clubs or any other suit divides, you have 13 top tricks. 5 declarers did not make all the tricks. (POLL3 Top tricks)
The only good chance is to establish the clubs tinyurl.com/y37f2jcm POLL 4 When you gain the lead, which suit
At least 2 chances to make at least 3 clubs (75%). The finesse works, the missing clubs divide 3:3, or someone discards a club from a 4-card suit tinyurl.com/ycplvtav
4. Only half made 12 tricks. There is really only one good chance to make 12 tricks. tinyurl.com/w7lu2cm Poll5 How many top tricks (11)

[@clincher1961]

Surely in hand 9 you should have held up the hearts for one round?

[@williamthurl2607]

I have 13 tricks if I sort them : 6 Clubs ,4 Diamonds ,and 3 in the Majors = 13 tricks .