'back to square one' vs 'back to piece one'

[Neece]

English Language Tests, Intermediate level

ESL/EFL Test #279 "English Slang Idioms (1)", question 2

The wall we were building fell over; I guess we're back to ......... one.

(a) fact
(b) platform
(c) piece
(d) square

English Language Tests, Intermediate level

ESL/EFL Test #279 "English Slang Idioms (1)", answer 2

The wall we were building fell over; I guess we're back to square one.

Correct answer: (d) square

Your answer was: incorrect
The wall we were building fell over; I guess we're back to piece one.
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can you explain?

Neece

[Linda]

Hi Neece,
"Back to square one" refers to starting over and going back to the starting/beginning point because the first attempt failed. It's an expression used when a person is trying to complete a project but that initial project plan is going to fail or has failed so they have to start again - they are back to square one.
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