What is chess miracle?
One of all the possible definitions: in a rated tournament, there is a difference of at least 500 points between the two opponents and the lower rated player wins. Here we have a first category player (Class A) who has beaten a GM in the Lugano (Switzerland) 1st Casinò Open. Curioni, F. (1952) - Meijers,V (2485)
If the readers are aware of these kind of chess miracles, please let me know and they will be published on this blog.