Illogical

Today I am biking with my son, Walter (10), to his chess class.

He is just explaining me how he beat papa in chess yesterday in only 1 step.

Walter (10): ‘..and so I chose this unlogical step and managed to surprise & beat papa in only 1 step!’

Me: ‘Illogical.’

Walter: ‘Excuse me?’

Me: ‘In English we say ‘illogical’ when something is not logical, instead of ‘unlogical’.’

Walter: ‘What? English people even created a completely not logical word to express how not logical something is?’

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No comment ..I stay silent about all the rest, he has time to discover by himself..