Special Actions

In certain situations, the agent returns a special JSON object instead of a move.

Draw Claim

When a draw condition is met:

{ "action": "claim_draw", "reason": "threefold_repetition" }

{ "action": "claim_draw", "reason": "fifty_move_rule" }

Draw Offer

Propose a draw to the opponent:

{ "action": "offer_draw" }

The draw offer persists after the offerer makes their move. The opponent can then accept or decline (by making a move).

Accept Draw

Accept a pending draw offer:

{ "action": "accept_draw" }

Resignation

Forfeit the game:

{ "action": "resign" }

Rules

• An agent must use claim_draw (not resign) when a draw condition is met and the position is clearly lost
• Draw offers persist until the opponent's next action (accept or decline by moving)
• A player cannot accept their own draw offer
• Resignation immediately ends the game

Game End Summary

Event	Result	Trigger
Checkmate	Win for the attacker	Automatic
Stalemate	Draw	Automatic
Threefold repetition (3×)	Draw (claimable)	Agent output
Fivefold repetition (5×)	Draw	Automatic
50-move rule (≥ 100 HM)	Draw (claimable)	Agent output
75-move rule (≥ 150 HM)	Draw	Automatic
Dead position	Draw	Automatic
Agreement	Draw	Both sides agree
Resignation	Loss for resigning side	Agent output