Good attempts so far, there might have been a restart and the bot sometimes doesn't recover as it should part way through a game.
Entries for Weekly Challenge 6 has closed. Thanks to all users who participated.
The winner is @statmatt who manged 80 moves (160 ply) without a capture and won after 107 moves (213 ply) with the following entry: playstrategy.org/giB8ohwG
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-7-king-of-the-square