Entries for Weekly Challenge 53 has closed. Thanks to all users who participated.
The winner is @root7000 who won a game of Chess against @PS-Greedy-One-Move with a castling move for checkmate in 12 moves (24 ply) in the following game: playstrategy.org/8r5K1wkO
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-54-quickest-lines-win