Entries for Weekly Challenge 49 has closed. Thanks to all users who participated.
The winner is @e-pluszak who won a game of Three-Check Chess against @PS-Greedy-Two-Move with 14 unmoved pieces in just 6 moves (12 ply) in the following game: playstrategy.org/j0NzmW9B
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-50-forbidden-dragon