Chess: Detect checkmate and stalemate (kinda)
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Wuzzy
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fb081e5411
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db80dd58db
130
src/chess.lua
130
src/chess.lua
@ -126,7 +126,17 @@ local function attacked(color, idx, board)
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return threatDetected
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end
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local function get_possible_moves(board, from_idx)
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-- Returns all theoretically possible moves from a given
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-- square, according to the piece it occupies. Ignores restrictions like check, etc.
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-- If the square is empty, no moves are returned.
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-- Parameters:
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-- * board: chessboard table
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-- * from_idx:
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-- returns: table with the keys used as destination indices
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-- Any key with a numeric value is a possible destination.
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-- The numeric value is a move rating for AI and is 0 by default.
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-- Example: { [4] = 0, [9] = 0 } -- can move to squares 4 and 9
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local function get_theoretical_moves_from(board, from_idx)
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local piece, color = board[from_idx]:match(":(%w+)_(%w+)")
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if not piece then
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return {}
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@ -513,6 +523,33 @@ local function get_possible_moves(board, from_idx)
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return moves
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end
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-- returns all theoretically possible moves on the board for a player
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-- Parameters:
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-- * board: chessboard table
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-- * player: "black" or "white"
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-- returns: table of this format:
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-- {
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-- [origin_index_1] = { [destination_index_1] = r1, [destination_index_2] = r2 },
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-- [origin_index_2] = { [destination_index_3] = r3 },
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-- ...
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-- }
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-- origin_index is the board index for the square to start the piece from (as string)
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-- and this is the key for a list of destination indixes.
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-- r1, r2, r3 ... are numeric values (normally 0) to "rate" this square for AI.
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local function get_theoretical_moves_for(board, player)
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local moves = {}
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for i = 1, 64 do
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local possibleMoves = get_theoretical_moves_from(board, i)
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if next(possibleMoves) then
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local stack_name = board[i]
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if stack_name:find(player) then
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moves[tostring(i)] = possibleMoves
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end
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end
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end
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return moves
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end
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local function best_move(moves)
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local value, choices = 0, {}
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@ -647,6 +684,10 @@ local function add_move_to_moves_list(meta, pieceFrom, pieceTo, pieceTo_s, from_
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meta:set_string("moves_raw", moves_raw)
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end
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local function add_special_to_moves_list(meta, special)
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add_move_to_moves_list(meta, "", "", "", "", "", special)
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end
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-- Create the full formspec string for the sequence of moves.
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-- Uses Figurine Algebraic Notation.
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local function get_moves_formstring(meta)
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@ -811,9 +852,9 @@ local function update_formspec(meta)
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-- player has resigned
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local resign_s = minetest.colorize("#FF0000", "["..S("resigned").."]")
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-- player has won
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local win_s = minetest.colorize("#00FF00", "["..S("winner").."]")
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local win_s = minetest.colorize("#26AB2B", "["..S("winner").."]")
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-- player has lost
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local lose_s = minetest.colorize("#00FF00", "["..S("loser").."]")
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local lose_s = minetest.colorize("#FF0000", "["..S("loser").."]")
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-- player has a draw
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local draw_s = minetest.colorize("#FF00FF", "["..S("draw").."]")
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@ -901,61 +942,77 @@ local function update_game_result(meta)
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local inv = meta:get_inventory()
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local board_t = board_to_table(inv)
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local playerWhite = meta:get_string("playerWhite")
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local playerBlack = meta:get_string("playerBlack")
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update_formspec(meta)
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local blackCanMove = false
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local whiteCanMove = false
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for i = 1, 64 do
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local possibleMovesHere = get_possible_moves(board_t, i)
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local stack_name = inv:get_stack("board", i):get_name()
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if stack_name:find("black") then
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for k, v in pairs(possibleMovesHere) do
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blackCanMove = true
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break
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end
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elseif stack_name:find("white") then
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for k, v in pairs(possibleMovesHere) do
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whiteCanMove = true
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break
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end
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end
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if blackCanMove and whiteCanMove then
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return
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end
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local blackMoves = get_theoretical_moves_for(board_t, "black")
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local whiteMoves = get_theoretical_moves_for(board_t, "white")
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local b = 0
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for k,v in pairs(blackMoves) do
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b = b + 1
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blackCanMove = true
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end
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local currentTurn
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local lastTurn = meta:get_string("lastTurn")
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if lastTurn == "black" or lastTurn == "" then
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currentTurn = "white"
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else
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currentTurn = "black"
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b = 0
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for k,v in pairs(whiteMoves) do
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b = b + 1
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whiteCanMove = true
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end
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if currentTurn == "black" and not blackCanMove then
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-- assume lastMove was updated *after* the player moved
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local lastMove = meta:get_string("lastMove")
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if lastMove == "white" and not blackCanMove then
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if meta:get_string("blackAttacked") == "true" then
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-- black was checkmated
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meta:set_string("gameResult", "whiteWon")
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meta:set_string("gameResultReason", "checkmate")
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add_special_to_moves_list(meta, "whiteWon")
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minetest.chat_send_player(playerWhite, chat_prefix .. S("You have checkmated @1. You win!", playerBlack))
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minetest.chat_send_player(playerBlack, chat_prefix .. S("You were checkmated by @1. You lose!", playerWhite))
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minetest.log("action", "[xdecor] Chess: "..playerWhite.." won against "..playerBlack.." by checkmate")
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return
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else
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-- stalemate
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meta:set_string("gameResult", "draw")
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meta:set_string("gameResultReason", "stalemate")
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add_special_to_moves_list(meta, "draw")
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minetest.chat_send_player(playerWhite, chat_prefix .. S("The game ended up in a stalemate! It's a draw!"))
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if playerWhite ~= playerBlack then
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minetest.chat_send_player(playerBlack, chat_prefix .. S("The game ended up in a stalemate! It's a draw!"))
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end
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minetest.log("action", "[xdecor] Chess: A game between "..playerWhite.." and "..playerBlack.." ended in a stalemate")
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return
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end
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end
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if currentTurn == "white" and not whiteCanMove then
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if lastMove == "black" and not whiteCanMove then
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if meta:get_string("whiteAttacked") == "true" then
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-- white was checkmated
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meta:set_string("gameResult", "blackWon")
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meta:set_string("gameResultReason", "checkmate")
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add_special_to_moves_list(meta, "blackWon")
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minetest.chat_send_player(playerBlack, chat_prefix .. S("You have checkmated @1. You win!", playerWhite))
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minetest.chat_send_player(playerWhite, chat_prefix .. S("You were checkmated by @1. You lose!", playerBlack))
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minetest.log("action", "[xdecor] Chess: "..playerBlack .." won against "..playerWhite.." by checkmate")
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return
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else
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-- stalemate
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meta:set_string("gameResult", "draw")
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meta:set_string("gameResultReason", "stalemate")
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add_special_to_moves_list(meta, "draw")
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minetest.chat_send_player(playerWhite, chat_prefix .. S("The game ended up in a stalemate! It's a draw!"))
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if playerWhite ~= playerBlack then
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minetest.chat_send_player(playerBlack, chat_prefix .. S("The game ended up in a stalemate! It's a draw!"))
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end
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minetest.log("action", "[xdecor] Chess: A game between "..playerWhite.." and "..playerBlack.." ended in a stalemate")
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return
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end
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end
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end
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function realchess.init(pos)
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local meta = minetest.get_meta(pos)
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local inv = meta:get_inventory()
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@ -1638,16 +1695,8 @@ local function ai_move(inv, meta)
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end
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if (lastMove == opponentColor or (aiColor == "white" and lastMove == "")) and gameResult == "" then
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update_formspec(meta)
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local moves = {}
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for i = 1, 64 do
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local possibleMoves = get_possible_moves(board_t, i)
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local stack_name = inv:get_stack("board", i):get_name()
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if stack_name:find(aiColor) then
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moves[tostring(i)] = possibleMoves
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end
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end
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local moves = get_theoretical_moves_for(board_t, aiColor)
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local choice_from, choice_to = best_move(moves)
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if choice_from == nil then
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@ -1758,6 +1807,7 @@ local function ai_move(inv, meta)
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add_move_to_moves_list(meta, pieceFrom, pieceTo, pieceTo_s, choice_from, choice_to)
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add_to_eaten_list(meta, pieceTo, pieceTo_s)
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update_game_result(meta)
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update_formspec(meta)
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@ -1856,10 +1906,10 @@ function realchess.fields(pos, _, fields, sender)
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meta:set_string("gameResultReason", "resign")
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if whiteWon then
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meta:set_string("gameResult", "whiteWon")
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add_move_to_moves_list(meta, "", "", "", "", "", "whiteWon")
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add_special_to_moves_list(meta, "whiteWon")
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else
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meta:set_string("gameResult", "blackWon")
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add_move_to_moves_list(meta, "", "", "", "", "", "blackWon")
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add_special_to_moves_list(meta, "blackWon")
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end
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minetest.chat_send_player(loser, chat_prefix .. S("You have resigned."))
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