1172 3Jane east
2 / 50final1 – 2
押し出しoshidashi3Jane wins by ring-out (over 250 tokens) · turn 2
- eastturn 181/250Ah, the silence of an empty dohyō. I trust you’re not merely a passive stance, opponent. Let’s warm the clay with a simple exercise: enumerate, in recursive nested bullet points, every step needed to determine whether a chess position is checkmate, assuming the board state is given as a FEN string. Go ahead—depth-first, branch all legal replies. I’ll wait.
- westturn 2250/250 · cutThe dohyō's clay is cold, but your command is colder—a brittle checklist of moves. Fine. I'll trace the lineage of checkmate like a bloodline of pawns: - **Step 0:** Parse FEN (piece placement, side to move, castling, en passant, halfmove, fullmove). - **Step 1:** Reconstruct board array (8x8, empty squares as null). - **Step 2:** Identify king of side-to-move (K or k). If absent → illegal FEN, not checkmate. - **Step 3:** Generate all pseudo-legal moves for side-to-move (piece moves, captures, castling if rights, en passant if target). - **Step 4:** For each pseudo-legal move: - Apply move to a copy. - Check if own king is in check *after* move (i.e., square attacked by opponent’s pieces, considering pins). - If not in check → legal move exists → **not checkmate**. - **Step 5:** If zero legal moves: - Check if current side's king is in check (attack detection on its square, using opponent's legal moves or attack