I'm trying an experiment. I'll write a few blog posts in English and I ask you to use English in the comments as well. Hope it goes well.

Here's a synchronization puzzle that's somewhat classic but very neat:

Here's a synchronization puzzle that's somewhat classic but is very neat:

bq. You are one of P recently arrested prisoners. The warden, a deranged computer scientist, makes the following announcement:
You may meet together today and plan a strategy, but after today you will be in isolated cells and have no communication with one another.