ChessAgine MCP

import { Chess } from "chess.js"; import { PIECE_VALUES } from "../types/types.js"; export function getGamePhase(chess: Chess): 'opening' | 'middlegame' | 'endgame' { const fen = chess.fen(); const moveNumber = parseInt(fen.split(' ')[5]) || 1; // Full move number const totalMaterial = getTotalMaterialValue(chess); // Count major pieces (queens and rooks) and minor pieces (bishops and knights) let queens = 0; let rooks = 0; let minorPieces = 0; // bishops + knights let totalPieces = 0; const board = chess.board(); for (const row of board) { for (const square of row) { if (square) { switch (square.type) { case 'q': queens++; break; case 'r': rooks++; break; case 'b': case 'n': minorPieces++; break; case 'p': case 'k': break; // Count separately or not at all } if (square.type !== 'k') totalPieces++; // Don't count kings } } } // Check if pieces have been developed (not in starting positions) const startingFen = "rnbqkbnr/pppppppp/8/8/8/8/PPPPPPPP/RNBQKBNR w KQkq - 0 1"; const isStartingPosition = chess.fen().split(' ')[0] === startingFen.split(' ')[0]; // ENDGAME CRITERIA (most restrictive first) // Classic endgame: Very low material or specific piece combinations if (totalMaterial <= 10 || // Very few pieces left (queens === 0 && rooks <= 2 && minorPieces <= 2) || // No queens, minimal pieces (queens <= 1 && rooks === 0 && minorPieces <= 1) || // Queen vs minimal pieces (totalPieces <= 6)) { // Very few total pieces return 'endgame'; } // OPENING CRITERIA // Early in the game with most pieces still on board if (moveNumber <= 12 || // Very early moves isStartingPosition || (totalMaterial >= 30 && moveNumber <= 20) || // High material, early moves (queens === 2 && rooks === 4 && minorPieces >= 6)) { // Most pieces undeveloped return 'opening'; } // ENDGAME CRITERIA (broader check after opening is ruled out) if (totalMaterial <= 20 || // Low material threshold queens === 0 || // No queens typically indicates endgame (queens === 1 && totalMaterial <= 25) || // Single queen with low material totalPieces <= 10) { // Limited pieces remaining return 'endgame'; } // Everything else is middlegame return 'middlegame'; } export function getTotalMaterialValue(chess: Chess): number { let total = 0; const board = chess.board(); for (const row of board) { for (const piece of row) { if (piece) { total += PIECE_VALUES[piece.type] || 0; } } } return total; }