Renegade 1.3.1 (July 14, 2026)
This is a small bugfix release addressing two issues:
- After adding support for non-power-of-2 transposition table sizes, the wrong part of the board hash got saved for each entry. This resulted in losing resiliency against hash collisions, corrupting parts of the search tree. The performance severely degraded as hash size, time control, and thread count increased.
- There was a move generation bug in FRC, where the engine allowed castling even if the king got in a check by a sliding piece on the backrank. Fortunately, positions like this are fairly rare in games.
Performance against version 1.3.0 at a time control of 50+0.5s (UHO_Lichess_4852_v1.epd):
Elo | 3.65 +- 2.36 (95%)
Conf | 50.0+0.50s Threads=1 Hash=128MB
Games | N: 20004 W: 4675 L: 4465 D: 10864
Penta | [4, 2283, 5217, 2495, 3]
While in most cases the performance was still acceptable, it is still advised to update to this version, especially when running it in a high hash, high thread count configuration.