12
legends to beat
Pick one on the right — each has its own depth, temper and blunder rate.
3
ways to play
The computer, two chairs at this screen, or a friend on a link.
1
rule above all
Captures are mandatory — chains included. Kings crown at the far rank and move both ways.
Select a level and click NEW GAME
LIVE MATCH
Play someone over the wire — a link or the code. You take Red.
CAPTURED
BY YOU
BY COMPUTER
Controls
Game
Engine
Clock
Board
LABS CHECKERS v3.1 • Advanced Engine
v3.1 — LIVE MATCH over the wire: invite by link or code, visitor links for spectators, the clock travels with the game
v3.0 — its own address at labs.llc/checkers/ (paper is the front door), PASS & PLAY at one screen, standard time controls (∞/1m/3m/5m/10m) with a falling flag, and both editions matched to the site's grammar
KEY FEATURES
• Minimax + alpha-beta, iterative deepening under a real time budget
• Personality weights: advancement, mobility, back-row defense, blunder rate
• Globally mandatory captures + forced multi-jump chains
• King promotion ends the move (standard rules)
• 40-move no-progress draw
ADVANCED CONTROLS
• UNDO — takes back your move and the AI's reply
• SWITCH SIDES — swap colors mid-game (board auto-flips)
• Change opponent mid-game — applies on the AI's next turn
• LIMIT THINKING caps the actual search, not just the delay
Red moves first. Win by capturing every enemy piece or leaving the opponent with no legal move.
v3.1 — LIVE MATCH over the wire: invite by link or code, visitor links for spectators, the clock travels with the game
v3.0 — its own address at labs.llc/checkers/ (paper is the front door), PASS & PLAY at one screen, standard time controls (∞/1m/3m/5m/10m) with a falling flag, and both editions matched to the site's grammar
KEY FEATURES
• Minimax + alpha-beta, iterative deepening under a real time budget
• Personality weights: advancement, mobility, back-row defense, blunder rate
• Globally mandatory captures + forced multi-jump chains
• King promotion ends the move (standard rules)
• 40-move no-progress draw
ADVANCED CONTROLS
• UNDO — takes back your move and the AI's reply
• SWITCH SIDES — swap colors mid-game (board auto-flips)
• Change opponent mid-game — applies on the AI's next turn
• LIMIT THINKING caps the actual search, not just the delay
Red moves first. Win by capturing every enemy piece or leaving the opponent with no legal move.