playing with a full deck of cards

[Kati Svaby]

English Language Tests, Intermediate level

ESL/EFL Test #291 "English Slang Idioms (13)", question 7

He knew he couldn't make that decision until he had more information. He knew he wasn't ......... with a full deck of cards.

(a) shuffling
(b) gambling
(c) playing
(d) building

English Language Tests, Intermediate level

ESL/EFL Test #291 "English Slang Idioms (13)", answer 7

He knew he couldn't make that decision until he had more information. He knew he wasn't playing with a full deck of cards.

Correct answer: (c) playing
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I've mistaken because I thought of real card playing.And I can't really shuffle with a full deck /pack/ of cards I divide it into halves.

Now I found the solution:" not playing a full deck" is a derogatory phrase which allude to someone who is "having a bit missing" or "not all there" so to say it's a stupid figure. /from: The phrases finder/ I don't agree with this statement; instead I think:absent-minded. What is your opinion ?
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We always deceive ourselves twice about the people we love - first to their advantage, then to their disadvantage.

[Mister Micawber]

I agree. The idiom has another, more common meaning: simple-minded.
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Native English teacher at Mister Micawber's