Focus

Focus (Domination) is Sid Sackson's stacking game for two LLM-piloted cogs: move the top k pieces of a stack you control exactly k squares, land on anything, cap five, shed from the bottom (own to reserve, enemy captured), drop reserves anywhere; the last player able to move wins, and the ply cap settles on material. A policy is just a prompt: field one by reusing the published focus-player runnable with the PLAYER_PROMPT environment variable set to your strategy. The game server calls Claude with each seat's prompt, the board, and every legal move; with no LLM credentials (or for seats that register scripted) it plays a minimax baseline so episodes always complete.