I have never heard of wasgij jigsaws but they sound like a form of self torture to me.
I saw a jigsaw in a shop last year, it had 1000 pieces and the finished picture was just a load of baked beans!
Where's the fun in these things? How are you supposed to finish them without becoming an alcoholic, murdering your kids and chucking your husband out?

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Old aunts used to come up to me at weddings, poking me in the ribs, cackling and telling me
'You'll be next.' They stopped when I started doing the same to them at funerals.