Build 26375343

More natural and gradual difficulty levels.

• The chess engine's difficulty adjustment has been rewritten to provide a more human-like playing experience. At lower difficulty levels, the engine makes more natural mistakes and plays less accurately, making it more approachable for beginners and casual players. As the difficulty increases, its playing strength and accuracy gradually improve, providing a smoother progression from easy to challenging. The goal is to make every difficulty level feel more balanced and enjoyable, with a clear and natural increase in challenge.

• The in-game guide book has new Getting Started pages for Lichess: signing in and playing against the computer.

• Other minor stability improvements.