Implement 50-move rule and same position rule
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Wuzzy
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7c27bb75ed
commit
21bcfeada2
107
src/chess.lua
107
src/chess.lua
@ -1711,17 +1711,20 @@ local function update_formspec(meta)
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"tooltip[resign;"..FS("Resign").."]"
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end
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if playerActionsAvailable then
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local drawClaim = meta:get_string("drawClaim")
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if playerActionsAvailable and drawClaim == "" then
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-- 50-move rule
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local halfmoveClock = meta:get_int("halfmoveClock")
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if halfmoveClock == 99 then
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-- when the 50 moves without capture / pawn move is about to occur
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-- When the 50 moves without capture / pawn move is about to occur.
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-- Will trigger "draw claim" mode in which player must do the final move that triggers the draw
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game_buttons = game_buttons .. "image_button[13.36,9.7;0.8,0.8;chess_draw_50move_next.png;draw_50_moves;]"..
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"tooltip[draw_50_moves;"..
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FS("Invoke the 50-move rule and try to draw the game in your next move.").."\n"..
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FS("If your next move is the 50th consecutive move of both players where no pawn moved and no piece was captured, the game will be drawn.").."]"
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elseif halfmoveClock >= 100 then
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-- when the 50 moves without capture / pawn move have occured occur
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-- When the 50 moves without capture / pawn move have occured occur.
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-- Will insta-draw.
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game_buttons = game_buttons .. "image_button[13.36,9.7;0.8,0.8;chess_draw_50move.png;draw_50_moves;]"..
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"tooltip[draw_50_moves;"..
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FS("Invoke the 50-move rule and draw the game.").."\n"..
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@ -1733,20 +1736,40 @@ local function update_formspec(meta)
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local positions = get_positions_history(meta)
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local maxRepeatedPositions = count_repeated_positions(positions, 3)
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if maxRepeatedPositions == 2 then
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-- If the same position is about to occur 3 times
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-- If the same position is about to occur 3 times.
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-- Will trigger "draw claim" mode in which player must do the final move that triggers the draw.
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game_buttons = game_buttons .. "image_button[12.36,9.7;0.8,0.8;chess_draw_repeat3_next.png;draw_repeat_3;]"..
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"tooltip[draw_repeat_3;"..
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FS("Invoke the 'same position' rule and try to draw the game in your next move.").."\n"..
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S("If your next move causes the same position to occur a 3rd time, the game will be drawn.").."]"
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FS("If your next move causes the same position to occur a 3rd time, the game will be drawn.").."]"
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elseif maxRepeatedPositions >= 3 then
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-- If the same position has already occured 3 times
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-- Will insta-draw.
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game_buttons = game_buttons .. "image_button[12.36,9.7;0.8,0.8;chess_draw_repeat3.png;draw_repeat_3;]"..
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"tooltip[draw_repeat_3;"..
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FS("Invoke the 'same position' rule and draw the game.").."\n"..
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S("(The same position has occured 3 times.)").."]"
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FS("(The same position has occured 3 times.)").."]"
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end
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end
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local s_draw_claim = ""
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-- Change interface when in "draw claim" mode to make the move
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-- that triggers the draw condition
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if drawClaim == "50_move_rule" then
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eaten_img = ""
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s_draw_claim = "" ..
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"image[13.36,9.7;0.8,0.8;chess_draw_50move_next.png]" ..
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"tooltip[13.36,9.7;0.8,0.8;"..
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FS("Draw claim active: 50-move rule").."\n"..
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FS("If the next move satisfies the 50-move rule, the game is drawn.").."]"
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elseif drawClaim == "same_position_3" then
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eaten_img = ""
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s_draw_claim = "" ..
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"image[12.36,9.7;0.8,0.8;chess_draw_repeat3_next.png]" ..
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"tooltip[12.36,9.7;0.8,0.8;"..
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FS("Draw claim active: Same position").."\n"..
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FS("If the next move satisfies the same position rule, the game is drawn.").."]"
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end
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local debug_formstring = ""
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if CHESS_DEBUG then
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@ -1788,6 +1811,7 @@ local function update_formspec(meta)
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"label[2.2,10.21;" .. turnWhite .. minetest.formspec_escape(status_white) .. "]" ..
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whiteArr ..
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"table[9.9,1.25;5.45,4;moves;" .. moves .. ";"..mlistlen.."]" ..
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s_draw_claim ..
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promotion_formstring ..
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eaten_img ..
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game_buttons ..
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@ -1906,24 +1930,51 @@ local function update_game_result(meta)
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minetest.log("action", "[xdecor] Chess: A game between "..playerWhite.." and "..playerBlack.." ended in a draw by dead position")
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end
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-- 75-moves rule. Automatically draw game if the last 75 moves of EACH player (thus 150 halfmoves)
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-- 50-move rule, after a player issued a draw claim when the halfmove clock was at 99.
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-- If no pawn moved nor a piece was captured for >= 100 halfmoves, the game is drawn.
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if meta:get_int("halfmoveClock") >= 100 and meta:get_string("drawClaim") == "50_move_rule" then
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meta:set_string("drawClaim", "")
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meta:set_string("gameResult", "draw")
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meta:set_string("gameResultReason", "50_move_rule")
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add_special_to_moves_list(meta, "draw")
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update_formspec(meta)
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local claimer, other
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if lastMove == "black" or lastMove == "" then
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claimer = playerWhite
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other = playerBlack
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else
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claimer = playerBlack
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other = playerWhite
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end
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send_message(claimer, S("You have drawn the game by invoking the 50-move rule."), botColor)
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if claimer ~= other then
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send_message(other, S("@1 has drawn the game by invoking the 50-move rule.", claimer), botColor)
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end
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minetest.log("action", "[xdecor] Chess: A game between "..playerWhite.." and "..playerBlack.." ended in a draw because "..claimer.." has applied the 50-move rule")
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-- 75-move rule. Automatically draw game if the last 75 moves of EACH player (thus 150 halfmoves)
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-- neither moved a pawn or captured a piece.
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-- Important: This rule MUST be checked AFTER checkmate because checkmate takes precedence.
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if meta:get_int("halfmoveClock") >= 150 then
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elseif meta:get_int("halfmoveClock") >= 150 then
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meta:set_string("gameResult", "draw")
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meta:set_string("gameResultReason", "75_moves_rule")
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meta:set_string("gameResultReason", "75_move_rule")
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add_special_to_moves_list(meta, "draw")
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local msg = S("No piece was captured and no pawn was moved for 75 consecutive moves of each player. It's a draw!")
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send_message_2(playerWhite, playerBlack, msg, botColor)
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minetest.log("action", "[xdecor] Chess: A game between "..playerWhite.." and "..playerBlack.." ended in a draw via the 75-move rule")
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end
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-- Draw if same position appeared 5 times
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-- Draw if same position appeared >= 5 times
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-- or if it appeared >= 3 times and the player claimed the draw previously
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-- First, generate the position history
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local forceRepetitionDraw = false
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local chosenRepetitionDraw = false
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local positions = get_positions_history(meta)
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-- Then count the repeated positions
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local maxRepeatedPositions = count_repeated_positions(positions, 5)
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if maxRepeatedPositions >= 3 then
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chosenRepetitionDraw = true
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end
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if maxRepeatedPositions >= 5 then
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forceRepetitionDraw = true
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end
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@ -1979,7 +2030,28 @@ local function update_game_result(meta)
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local msg = S("The exact same position has occured 5 times. It's a draw!")
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send_message_2(playerWhite, playerBlack, msg, botColor)
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minetest.log("action", "[xdecor] Chess: A game between "..playerWhite.." and "..playerBlack.." ended in a draw because the same position has appeared 5 times")
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elseif chosenRepetitionDraw and meta:get_string("drawClaim") == "same_position_3" then
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meta:set_string("drawClaim", "")
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meta:set_string("gameResult", "draw")
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meta:set_string("gameResultReason", "same_position_3")
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add_special_to_moves_list(meta, "draw")
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update_formspec(meta)
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local claimer, other
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if lastMove == "black" or lastMove == "" then
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claimer = playerWhite
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other = playerBlack
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else
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claimer = playerBlack
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other = playerWhite
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end
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send_message(claimer, S("You have drawn the game by invoking the same position rule."), botColor)
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if claimer ~= other then
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send_message(other, S("@1 has drawn the game by invoking the same position rule.", claimer), botColor)
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end
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minetest.log("action", "[xdecor] Chess: A game between "..playerWhite.." and "..playerBlack.." ended in a draw because "..claimer.." has applied the same position rule")
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end
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meta:set_string("drawClaim", "")
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end
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@ -1995,6 +2067,7 @@ function realchess.init(pos)
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meta:set_string("lastMove", "")
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meta:set_string("gameResult", "")
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meta:set_string("gameResultReason", "")
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meta:set_string("drawClaim", "")
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meta:set_string("blackAttacked", "")
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meta:set_string("whiteAttacked", "")
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meta:set_string("promotionActive", "")
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@ -2760,15 +2833,16 @@ function realchess.fields(pos, _, fields, sender)
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local halfmoveClock = meta:get_int("halfmoveClock")
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if halfmoveClock == 99 then
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send_message(claimer, S("<not implemented>"), botColor)
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meta:set_string("drawClaim", "50_move_rule")
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update_formspec(meta)
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elseif halfmoveClock >= 100 then
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meta:set_string("gameResult", "draw")
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meta:set_string("gameResultReason", "50_move_rule")
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add_special_to_moves_list(meta, "draw")
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update_formspec(meta)
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send_message(claimer, S("You have drawn the game by applying the 50-move rule."), botColor)
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send_message(claimer, S("You have drawn the game by invoking the 50-move rule."), botColor)
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if claimer ~= other then
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send_message(other, S("@1 has drawn the game by applying the 50-move rule.", claimer), botColor)
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send_message(other, S("@1 has drawn the game by invoking the 50-move rule.", claimer), botColor)
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end
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minetest.log("action", "[xdecor] Chess: A game between "..playerWhite.." and "..playerBlack.." ended in a draw because "..claimer.." has applied the 50-move rule")
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else
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@ -2807,15 +2881,16 @@ function realchess.fields(pos, _, fields, sender)
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local positions = get_positions_history(meta)
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local maxRepeatedPositions = count_repeated_positions(positions, 3)
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if maxRepeatedPositions == 2 then
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send_message(claimer, S("<not implemented>"), botColor)
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meta:set_string("drawClaim", "same_position_3")
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update_formspec(meta)
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elseif maxRepeatedPositions >= 3 then
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meta:set_string("gameResult", "draw")
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meta:set_string("gameResultReason", "same_position_3")
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add_special_to_moves_list(meta, "draw")
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update_formspec(meta)
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send_message(claimer, S("You have drawn the game by applying the same position rule."), botColor)
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send_message(claimer, S("You have drawn the game by invoking the same position rule."), botColor)
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if claimer ~= other then
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send_message(other, S("@1 has drawn the game by applying the same position rule.", claimer), botColor)
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send_message(other, S("@1 has drawn the game by invoking the same position rule.", claimer), botColor)
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end
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minetest.log("action", "[xdecor] Chess: A game between "..playerWhite.." and "..playerBlack.." ended in a draw because "..claimer.." has applied the same position rule")
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else
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