CCRL Challenger
Set up your game
New Game
Choose your side and how much time the engine gets for each move.
Playing against:
Ratsu 2.1.0 64-bit
Play as
White
Black
Random
Starting FEN (optional)
Enter a Chess960 position to play a Chess960 game
Generate a random Chess960 position
Leave blank to start from the normal starting position.
Hardware mode
1970 Hardware
1975 PC
1980 PC
1985 PC
1990 PC
1995 PC
2000 PC
2005 PC
Modern PC
Simulate an approximate historical computer-era resource profile. The CPU reference is 2000 MHz; 1 MHz = 0.05% of the reference CPU. Hardware modes use 1 engine thread.
CPU speed: 2000 MHz
CPU Power: 100.0% of 2000 MHz
Hash size: 32 MB
Computer move time
From 0.001 to 5 seconds per computer move.
Use opening book
Maximum book moves
Number of moves for which the opening book may be used.
Choose a new opponent
