playstrategy.org/I5ZNauiS/p1#0 8 moves on stockfish level 2 finally!
Entries for Weekly Challenge 7 has closed. Thanks to all users who participated.
The winner is @CVirus who managed to fill the middle four squares in just 8 moves (15 ply) against Stockfish level 3 in the following game: playstrategy.org/mA9RPZrz
Users are still welcome to attempt this challenge and post answers here, but the winner has been fixed. The next challenge can be found here: playstrategy.org/forum/weekly-challenges/weekly-challenge-8-lines-of-difference