rule: Support removing unplaced piece

If a player forms the mill in the placing phase, she will remove
the opponent's unplaced piece and continue to make a move.

src/position.cpp

@@ -694,7 +694,35 @@ bool Position::put_piece(Square s, bool updateRecord)
         } else {
             pieceToRemoveCount = rule.mayRemoveMultiple ? n : 1;
             update_key_misc();
-            action = Action::remove;
+
+            if (rule.mayOnlyRemoveUnplacedPieceInPlacingPhase) {
+                pieceInHandCount[them] -= 1; // Or pieceToRemoveCount?;
+
+                if (pieceInHandCount[them] < 0) {
+                    pieceInHandCount[them] = 0;
+                }
+
+                assert(pieceInHandCount[WHITE] >= 0 && pieceInHandCount[BLACK] >= 0);
+
+                if (pieceInHandCount[WHITE] == 0 && pieceInHandCount[BLACK] == 0) {
+                    if (check_if_game_is_over()) {
+                        return true;
+                    }
+
+                    phase = Phase::moving;
+                    action = Action::select;
+
+                    if (rule.isDefenderMoveFirst) {
+                        change_side_to_move();
+                    }
+
+                    if (check_if_game_is_over()) {
+                        return true;
+                    }
+                }
+            } else {
+                action = Action::remove;
+            }
         }
 
     } else if (phase == Phase::moving) {

src/rule.cpp

@@ -33,6 +33,7 @@ struct Rule rule = {
         false,      // 先摆棋者先行棋
         false,      // 多个“三连”只能提一子
         false,      // 不能提对手的“三连”子，除非无子可提；
+        false,      // 摆子阶段不移除对方未摆的棋子；
         true,       // 摆棋满子（闷棋，只有12子棋才出现）算先手负
         true,       // 走棋阶段不能行动（被“闷”）算负
         true,       // 剩三子时可以飞棋
@@ -59,6 +60,7 @@ const struct Rule RULES[N_RULES] = {
         false,      // 先摆棋者先行棋
         false,      // 多个“三连”只能提一子
         false,      // 不能提对手的“三连”子，除非无子可提；
+        false,      // 摆子阶段不移除对方未摆的棋子；
         true,       // 摆棋满子（闷棋，只有12子棋才出现）算先手负
         true,       // 走棋阶段不能行动（被“闷”）算负
         false,      // 剩三子时不可以飞棋
@@ -82,6 +84,7 @@ const struct Rule RULES[N_RULES] = {
         true,       // 后摆棋者先行棋
         false,      // 多个“三连”只能提一子
         true,       // 可以提对手的“三连”子
+        false,      // 摆子阶段不移除对方未摆的棋子；
         true,       // 摆棋满子（闷棋，只有12子棋才出现）算先手负
         true,       // 走棋阶段不能行动（被“闷”）算负
         false,      // 剩三子时不可以飞棋
@@ -100,6 +103,7 @@ const struct Rule RULES[N_RULES] = {
         false,      // 先摆棋者先行棋
         false,      // 多个“三连”只能提一子
         false,      // 不能提对手的“三连”子，除非无子可提；
+        false,      // 摆子阶段不移除对方未摆的棋子；
         true,       // 摆棋满子（闷棋，只有12子棋才出现）算先手负
         true,       // 走棋阶段不能行动（被“闷”）算负
         true,       // 剩三子时可以飞棋
@@ -123,6 +127,7 @@ const struct Rule RULES[N_RULES] = {
         false,      // 先摆棋者先行棋
         false,      // 多个“三连”只能提一子
         false,      // 不能提对手的“三连”子，除非无子可提；
+        false,      // 摆子阶段不移除对方未摆的棋子；
         true,       // 摆棋满子（闷棋，只有12子棋才出现）算先手负
         true,       // 走棋阶段不能行动（被“闷”）算负
         true,       // 剩三子时可以飞棋
@@ -141,6 +146,7 @@ const struct Rule RULES[N_RULES] = {
         false,      // 先摆棋者先行棋
         false,      // 多个“三连”只能提一子
         false,      // 不能提对手的“三连”子，除非无子可提；
+        false,      // 摆子阶段不移除对方未摆的棋子；
         true,       // 摆棋满子（闷棋，只有12子棋才出现）算先手负
         true,       // 走棋阶段不能行动（被“闷”）算负
         true,       // 剩三子时可以飞棋

src/rule.h

@@ -56,6 +56,9 @@ struct Rule
     // Enable this option to disable the limitation.
     bool mayRemoveFromMillsAlways;
 
+    // If a player forms the mill in the placing phase, she will remove the opponent's unplaced piece and continue to make a move.
+    bool mayOnlyRemoveUnplacedPieceInPlacingPhase;
+
     // At the end of the placing phase, when the board is full,
     // the side that places first loses the game, otherwise, the game is a draw.
     bool isWhiteLoseButNotDrawWhenBoardFull;

src/ucioption.cpp

@@ -142,6 +142,11 @@ void on_mayRemoveFromMillsAlways(const Option &o)
     rule.mayRemoveFromMillsAlways = (bool)o;
 }
 
+void on_mayOnlyRemoveUnplacedPieceInPlacingPhase(const Option &o)
+{
+    rule.mayOnlyRemoveUnplacedPieceInPlacingPhase = (bool)o;
+}
+
 void on_isWhiteLoseButNotDrawWhenBoardFull(const Option &o)
 {
     rule.isWhiteLoseButNotDrawWhenBoardFull = (bool)o;
@@ -211,6 +216,7 @@ void init(OptionsMap &o)
     o["IsDefenderMoveFirst"] << Option(false, on_isDefenderMoveFirst);
     o["MayRemoveMultiple"] << Option(false, on_mayRemoveMultiple);
     o["MayRemoveFromMillsAlways"] << Option(false, on_mayRemoveFromMillsAlways);
+    o["MayOnlyRemoveUnplacedPieceInPlacingPhase"] << Option(false, on_mayOnlyRemoveUnplacedPieceInPlacingPhase);
     o["IsWhiteLoseButNotDrawWhenBoardFull"] << Option(true, on_isWhiteLoseButNotDrawWhenBoardFull);
     o["IsLoseButNotChangeSideWhenNoWay"] << Option(true, on_isLoseButNotChangeSideWhenNoWay);
     o["MayFly"] << Option(true, on_mayFly);

src/ui/flutter_app/lib/common/config.dart

@@ -92,6 +92,7 @@ class Config {
   static bool isDefenderMoveFirst = false;
   static bool mayRemoveMultiple = false;
   static bool mayRemoveFromMillsAlways = false;
+  static bool mayOnlyRemoveUnplacedPieceInPlacingPhase = false;
   static bool isWhiteLoseButNotDrawWhenBoardFull = true;
   static bool isLoseButNotChangeSideWhenNoWay = true;
   static bool mayFly = true;
@@ -195,6 +196,9 @@ class Config {
         Config.mayRemoveMultiple = settings['MayRemoveMultiple'] ?? false;
     rule.mayRemoveFromMillsAlways = Config.mayRemoveFromMillsAlways =
         settings['MayRemoveFromMillsAlways'] ?? false;
+    rule.mayOnlyRemoveUnplacedPieceInPlacingPhase =
+        Config.mayOnlyRemoveUnplacedPieceInPlacingPhase =
+            settings['MayOnlyRemoveUnplacedPieceInPlacingPhase'] ?? false;
     rule.isWhiteLoseButNotDrawWhenBoardFull =
         Config.isWhiteLoseButNotDrawWhenBoardFull =
             settings['IsWhiteLoseButNotDrawWhenBoardFull'] ?? true;
@@ -275,6 +279,8 @@ class Config {
     settings['IsDefenderMoveFirst'] = Config.isDefenderMoveFirst;
     settings['MayRemoveMultiple'] = Config.mayRemoveMultiple;
     settings['MayRemoveFromMillsAlways'] = Config.mayRemoveFromMillsAlways;
+    settings['MayOnlyRemoveUnplacedPieceInPlacingPhase'] =
+        Config.mayOnlyRemoveUnplacedPieceInPlacingPhase;
     settings['IsWhiteLoseButNotDrawWhenBoardFull'] =
         Config.isWhiteLoseButNotDrawWhenBoardFull;
     settings['IsLoseButNotChangeSideWhenNoWay'] =

src/ui/flutter_app/lib/engine/native_engine.dart

@@ -164,6 +164,8 @@ class NativeEngine extends Engine {
         'setoption name MayRemoveMultiple value ${Config.mayRemoveMultiple}');
     await send(
         'setoption name MayRemoveFromMillsAlways value ${Config.mayRemoveFromMillsAlways}');
+    await send(
+        'setoption name MayOnlyRemoveUnplacedPieceInPlacingPhase value ${Config.mayOnlyRemoveUnplacedPieceInPlacingPhase}');
     await send(
         'setoption name IsWhiteLoseButNotDrawWhenBoardFull value ${Config.isWhiteLoseButNotDrawWhenBoardFull}');
     await send(

src/ui/flutter_app/lib/l10n/intl_ar.arb

@@ -1200,5 +1200,13 @@
     "algorithm": "الخوارزمية",
     "@algorithm": {
         "description": "Algorithm"
+    },
+    "removeUnplacedPiece": "قم بإزالة القطعة غير الموضوعة",
+    "@removeUnplacedPiece": {
+        "description": "Remove unplaced piece"
+    },
+    "removeUnplacedPiece_Detail": "إذا قام اللاعب بتشكيل الطاحونة في مرحلة التسوية ، فسوف يقوم بإزالة القطعة غير الموضوعة للخصم ويستمر في التحرك.",
+    "@removeUnplacedPiece_Detail": {
+        "description": "If a player forms the mill in the placing phase, she will remove the opponent's unplaced piece and continue to make a move."
     }
 }

src/ui/flutter_app/lib/l10n/intl_bg.arb

@@ -1200,5 +1200,13 @@
     "algorithm": "Алгоритъм",
     "@algorithm": {
         "description": "Algorithm"
+    },
+    "removeUnplacedPiece": "Отстранете непоставеното парче",
+    "@removeUnplacedPiece": {
+        "description": "Remove unplaced piece"
+    },
+    "removeUnplacedPiece_Detail": "Ако играч формира мелницата във фазата на поставяне, тя ще премахне непоставената фигура на противника и ще продължи да прави ход.",
+    "@removeUnplacedPiece_Detail": {
+        "description": "If a player forms the mill in the placing phase, she will remove the opponent's unplaced piece and continue to make a move."
     }
 }

src/ui/flutter_app/lib/l10n/intl_bn.arb

@@ -1200,5 +1200,13 @@
     "algorithm": "অ্যালগরিদম",
     "@algorithm": {
         "description": "Algorithm"
+    },
+    "removeUnplacedPiece": "স্থানহীন টুকরা সরান",
+    "@removeUnplacedPiece": {
+        "description": "Remove unplaced piece"
+    },
+    "removeUnplacedPiece_Detail": "যদি প্লেয়ার প্লেসিং পর্যায়ে মিল গঠন করে, সে প্রতিপক্ষের স্থানহীন টুকরাটি সরিয়ে দেবে এবং একটি পদক্ষেপ নিতে থাকবে।",
+    "@removeUnplacedPiece_Detail": {
+        "description": "If a player forms the mill in the placing phase, she will remove the opponent's unplaced piece and continue to make a move."
     }
 }

src/ui/flutter_app/lib/l10n/intl_cs.arb

@@ -1200,5 +1200,13 @@
     "algorithm": "Algoritmus",
     "@algorithm": {
         "description": "Algorithm"
+    },
+    "removeUnplacedPiece": "Odstraňte neumístěný kus",
+    "@removeUnplacedPiece": {
+        "description": "Remove unplaced piece"
+    },
+    "removeUnplacedPiece_Detail": "Pokud hráč vytvoří mlýn ve fázi umisťování, odstraní soupeřovu neumístěnou figurku a pokračuje v tahu.",
+    "@removeUnplacedPiece_Detail": {
+        "description": "If a player forms the mill in the placing phase, she will remove the opponent's unplaced piece and continue to make a move."
     }
 }

src/ui/flutter_app/lib/l10n/intl_da.arb

@@ -1200,5 +1200,13 @@
     "algorithm": "Algoritme",
     "@algorithm": {
         "description": "Algorithm"
+    },
+    "removeUnplacedPiece": "Fjern uplaceret stykke",
+    "@removeUnplacedPiece": {
+        "description": "Remove unplaced piece"
+    },
+    "removeUnplacedPiece_Detail": "Hvis en spiller danner møllen i placeringsfasen, vil hun fjerne modstanderens uplacerede brik og fortsætte med at foretage et træk.",
+    "@removeUnplacedPiece_Detail": {
+        "description": "If a player forms the mill in the placing phase, she will remove the opponent's unplaced piece and continue to make a move."
     }
 }

src/ui/flutter_app/lib/l10n/intl_de.arb

@@ -1200,5 +1200,13 @@
     "algorithm": "Algorithmus",
     "@algorithm": {
         "description": "Algorithm"
+    },
+    "removeUnplacedPiece": "Entfernen Sie nicht platzierte Steine",
+    "@removeUnplacedPiece": {
+        "description": "Remove unplaced piece"
+    },
+    "removeUnplacedPiece_Detail": "Wenn ein Spieler in der Platzierungsphase die Mühle bildet, entfernt er den nicht platzierten Stein des Gegners und macht weiter seinen Zug.",
+    "@removeUnplacedPiece_Detail": {
+        "description": "If a player forms the mill in the placing phase, she will remove the opponent's unplaced piece and continue to make a move."
     }
 }

src/ui/flutter_app/lib/l10n/intl_de_ch.arb

@@ -1200,5 +1200,13 @@
     "algorithm": "Algorithmus",
     "@algorithm": {
         "description": "Algorithm"
+    },
+    "removeUnplacedPiece": "Entfernen Sie nicht platzierte Steine",
+    "@removeUnplacedPiece": {
+        "description": "Remove unplaced piece"
+    },
+    "removeUnplacedPiece_Detail": "Wenn ein Spieler in der Platzierungsphase die Mühle bildet, entfernt er den nicht platzierten Stein des Gegners und macht weiter seinen Zug.",
+    "@removeUnplacedPiece_Detail": {
+        "description": "If a player forms the mill in the placing phase, she will remove the opponent's unplaced piece and continue to make a move."
     }
 }

src/ui/flutter_app/lib/l10n/intl_el.arb

@@ -1200,5 +1200,13 @@
     "algorithm": "Αλγόριθμος",
     "@algorithm": {
         "description": "Algorithm"
+    },
+    "removeUnplacedPiece": "Αφαιρέστε το μη τοποθετημένο κομμάτι",
+    "@removeUnplacedPiece": {
+        "description": "Remove unplaced piece"
+    },
+    "removeUnplacedPiece_Detail": "Εάν ένας παίκτης σχηματίσει το μύλο στη φάση τοποθέτησης, θα αφαιρέσει το μη τοποθετημένο κομμάτι του αντιπάλου και θα συνεχίσει να κάνει μια κίνηση.",
+    "@removeUnplacedPiece_Detail": {
+        "description": "If a player forms the mill in the placing phase, she will remove the opponent's unplaced piece and continue to make a move."
     }
 }

src/ui/flutter_app/lib/l10n/intl_en.arb

@@ -1200,5 +1200,13 @@
     "algorithm": "Algorithm",
     "@algorithm": {
         "description": "Algorithm"
+    },
+    "removeUnplacedPiece": "Remove unplaced piece",
+    "@removeUnplacedPiece": {
+        "description": "Remove unplaced piece"
+    },
+    "removeUnplacedPiece_Detail": "If a player forms the mill in the placing phase, she will remove the opponent's unplaced piece and continue to make a move.",
+    "@removeUnplacedPiece_Detail": {
+        "description": "If a player forms the mill in the placing phase, she will remove the opponent's unplaced piece and continue to make a move."
     }
 }

src/ui/flutter_app/lib/l10n/intl_es.arb

@@ -1200,5 +1200,13 @@
     "algorithm": "Algoritmo",
     "@algorithm": {
         "description": "Algorithm"
+    },
+    "removeUnplacedPiece": "Quitar pieza no colocada",
+    "@removeUnplacedPiece": {
+        "description": "Remove unplaced piece"
+    },
+    "removeUnplacedPiece_Detail": "Si un jugador forma el molino en la fase de colocación, retirará la pieza no colocada del oponente y continuará haciendo un movimiento.",
+    "@removeUnplacedPiece_Detail": {
+        "description": "If a player forms the mill in the placing phase, she will remove the opponent's unplaced piece and continue to make a move."
     }
 }

src/ui/flutter_app/lib/l10n/intl_et.arb

@@ -1200,5 +1200,13 @@
     "algorithm": "Algoritm",
     "@algorithm": {
         "description": "Algorithm"
+    },
+    "removeUnplacedPiece": "Eemaldage asetamata tükk",
+    "@removeUnplacedPiece": {
+        "description": "Remove unplaced piece"
+    },
+    "removeUnplacedPiece_Detail": "Kui mängija moodustab veski paigutamise faasis, eemaldab ta vastase asetamata tüki ja jätkab käigu tegemist.",
+    "@removeUnplacedPiece_Detail": {
+        "description": "If a player forms the mill in the placing phase, she will remove the opponent's unplaced piece and continue to make a move."
     }
 }

src/ui/flutter_app/lib/l10n/intl_fa.arb

@@ -1200,5 +1200,13 @@
     "algorithm": "الگوریتم",
     "@algorithm": {
         "description": "Algorithm"
+    },
+    "removeUnplacedPiece": "قطعه بدون محل را بردارید",
+    "@removeUnplacedPiece": {
+        "description": "Remove unplaced piece"
+    },
+    "removeUnplacedPiece_Detail": "اگر بازیکنی آسیاب را در مرحله قرار دادن تشکیل دهد ، مهره بدون محل حریف را برداشته و به حرکت خود ادامه می دهد.",
+    "@removeUnplacedPiece_Detail": {
+        "description": "If a player forms the mill in the placing phase, she will remove the opponent's unplaced piece and continue to make a move."
     }
 }

src/ui/flutter_app/lib/l10n/intl_fi.arb

@@ -1200,5 +1200,13 @@
     "algorithm": "Algoritmi",
     "@algorithm": {
         "description": "Algorithm"
+    },
+    "removeUnplacedPiece": "Poista sijoittamaton kappale",
+    "@removeUnplacedPiece": {
+        "description": "Remove unplaced piece"
+    },
+    "removeUnplacedPiece_Detail": "Jos pelaaja muodostaa myllyn sijoitusvaiheessa, hän poistaa vastustajan sijoittamattoman palan ja jatkaa siirtoa.",
+    "@removeUnplacedPiece_Detail": {
+        "description": "If a player forms the mill in the placing phase, she will remove the opponent's unplaced piece and continue to make a move."
     }
 }

src/ui/flutter_app/lib/l10n/intl_fr.arb

@@ -1200,5 +1200,13 @@
     "algorithm": "Algorithme",
     "@algorithm": {
         "description": "Algorithm"
+    },
+    "removeUnplacedPiece": "Retirer la pièce non placée",
+    "@removeUnplacedPiece": {
+        "description": "Remove unplaced piece"
+    },
+    "removeUnplacedPiece_Detail": "Si un joueur forme le moulin lors de la phase de placement, il retirera la pièce non placée de l'adversaire et continuera à se déplacer.",
+    "@removeUnplacedPiece_Detail": {
+        "description": "If a player forms the mill in the placing phase, she will remove the opponent's unplaced piece and continue to make a move."
     }
 }

src/ui/flutter_app/lib/l10n/intl_gu.arb

@@ -1200,5 +1200,13 @@
     "algorithm": "અલ્ગોરિધમ",
     "@algorithm": {
         "description": "Algorithm"
+    },
+    "removeUnplacedPiece": "સ્થાનાંતરિત ભાગ દૂર કરો",
+    "@removeUnplacedPiece": {
+        "description": "Remove unplaced piece"
+    },
+    "removeUnplacedPiece_Detail": "જો કોઈ ખેલાડી પ્લેસિંગ તબક્કામાં મિલની રચના કરે છે, તો તે વિરોધીના સ્થાનાંતરિત ભાગને દૂર કરશે અને ચાલ ચાલુ રાખશે.",
+    "@removeUnplacedPiece_Detail": {
+        "description": "If a player forms the mill in the placing phase, she will remove the opponent's unplaced piece and continue to make a move."
     }
 }

src/ui/flutter_app/lib/l10n/intl_hi.arb

@@ -1200,5 +1200,13 @@
     "algorithm": "कलन विधि",
     "@algorithm": {
         "description": "Algorithm"
+    },
+    "removeUnplacedPiece": "हटाए गए टुकड़े को हटा दें",
+    "@removeUnplacedPiece": {
+        "description": "Remove unplaced piece"
+    },
+    "removeUnplacedPiece_Detail": "यदि कोई खिलाड़ी प्लेसिंग चरण में चक्की बनाता है, तो वह प्रतिद्वंद्वी के स्थान से हटाए गए टुकड़े को हटा देगी और एक चाल चलती रहेगी।",
+    "@removeUnplacedPiece_Detail": {
+        "description": "If a player forms the mill in the placing phase, she will remove the opponent's unplaced piece and continue to make a move."
     }
 }

src/ui/flutter_app/lib/l10n/intl_hr.arb

@@ -1200,5 +1200,13 @@
     "algorithm": "Algoritam",
     "@algorithm": {
         "description": "Algorithm"
+    },
+    "removeUnplacedPiece": "Uklonite nenamješteni komad",
+    "@removeUnplacedPiece": {
+        "description": "Remove unplaced piece"
+    },
+    "removeUnplacedPiece_Detail": "Ako igrač formira mlin u fazi postavljanja, uklonit će protivnikov nezamješten dio i nastaviti činiti potez.",
+    "@removeUnplacedPiece_Detail": {
+        "description": "If a player forms the mill in the placing phase, she will remove the opponent's unplaced piece and continue to make a move."
     }
 }

src/ui/flutter_app/lib/l10n/intl_hu.arb

@@ -1200,5 +1200,13 @@
     "algorithm": "Algoritmus",
     "@algorithm": {
         "description": "Algorithm"
+    },
+    "removeUnplacedPiece": "Távolítsa el az elhelyezett darabot",
+    "@removeUnplacedPiece": {
+        "description": "Remove unplaced piece"
+    },
+    "removeUnplacedPiece_Detail": "Ha egy játékos az elhelyezési szakaszban megalapítja a malmot, akkor eltávolítja az ellenfél elhelyezett darabját, és folytatja a lépést.",
+    "@removeUnplacedPiece_Detail": {
+        "description": "If a player forms the mill in the placing phase, she will remove the opponent's unplaced piece and continue to make a move."
     }
 }

src/ui/flutter_app/lib/l10n/intl_id.arb

@@ -1200,5 +1200,13 @@
     "algorithm": "algoritma",
     "@algorithm": {
         "description": "Algorithm"
+    },
+    "removeUnplacedPiece": "Hapus bagian yang tidak ditempatkan",
+    "@removeUnplacedPiece": {
+        "description": "Remove unplaced piece"
+    },
+    "removeUnplacedPiece_Detail": "Jika seorang pemain membentuk penggilingan di fase penempatan, dia akan menghapus bidak lawan yang belum ditempatkan dan terus bergerak.",
+    "@removeUnplacedPiece_Detail": {
+        "description": "If a player forms the mill in the placing phase, she will remove the opponent's unplaced piece and continue to make a move."
     }
 }

src/ui/flutter_app/lib/l10n/intl_it.arb

@@ -1200,5 +1200,13 @@
     "algorithm": "Algoritmo",
     "@algorithm": {
         "description": "Algorithm"
+    },
+    "removeUnplacedPiece": "Rimuovere il pezzo non posizionato",
+    "@removeUnplacedPiece": {
+        "description": "Remove unplaced piece"
+    },
+    "removeUnplacedPiece_Detail": "Se un giocatore forma il mulino nella fase di piazzamento, rimuoverà il pezzo non piazzato dell'avversario e continuerà a fare una mossa.",
+    "@removeUnplacedPiece_Detail": {
+        "description": "If a player forms the mill in the placing phase, she will remove the opponent's unplaced piece and continue to make a move."
     }
 }

src/ui/flutter_app/lib/l10n/intl_ja.arb

@@ -1200,5 +1200,13 @@
     "algorithm": "アルゴリズム",
     "@algorithm": {
         "description": "Algorithm"
+    },
+    "removeUnplacedPiece": "相手の手に残っているチェスの駒しか食べられない",
+    "@removeUnplacedPiece": {
+        "description": "Remove unplaced piece"
+    },
+    "removeUnplacedPiece_Detail": "スリーカムが形成されると、対戦相手の配置されていないピースのみをキャプチャしてゲームを続行できます。",
+    "@removeUnplacedPiece_Detail": {
+        "description": "If a player forms the mill in the placing phase, she will remove the opponent's unplaced piece and continue to make a move."
     }
 }

src/ui/flutter_app/lib/l10n/intl_kn.arb

@@ -1200,5 +1200,13 @@
     "algorithm": "ಅಲ್ಗಾರಿದಮ್",
     "@algorithm": {
         "description": "Algorithm"
+    },
+    "removeUnplacedPiece": "ಸ್ಥಳವಿಲ್ಲದ ತುಂಡನ್ನು ತೆಗೆಯಿರಿ",
+    "@removeUnplacedPiece": {
+        "description": "Remove unplaced piece"
+    },
+    "removeUnplacedPiece_Detail": "ಇರಿಸುವ ಹಂತದಲ್ಲಿ ಆಟಗಾರ್ತಿಯು ಗಿರಣಿಯನ್ನು ರೂಪಿಸಿದರೆ, ಆಕೆ ಎದುರಾಳಿಯ ಸ್ಥಾನವಿಲ್ಲದ ತುಂಡನ್ನು ತೆಗೆದು ಚಲನೆಯನ್ನು ಮುಂದುವರಿಸುತ್ತಾಳೆ.",
+    "@removeUnplacedPiece_Detail": {
+        "description": "If a player forms the mill in the placing phase, she will remove the opponent's unplaced piece and continue to make a move."
     }
 }

src/ui/flutter_app/lib/l10n/intl_ko.arb

@@ -1200,5 +1200,13 @@
     "algorithm": "연산",
     "@algorithm": {
         "description": "Algorithm"
+    },
+    "removeUnplacedPiece": "배치되지 않은 조각 제거",
+    "@removeUnplacedPiece": {
+        "description": "Remove unplaced piece"
+    },
+    "removeUnplacedPiece_Detail": "플레이어가 배치 단계에서 밀을 형성하면 상대의 배치되지 않은 조각을 제거하고 계속 이동합니다.",
+    "@removeUnplacedPiece_Detail": {
+        "description": "If a player forms the mill in the placing phase, she will remove the opponent's unplaced piece and continue to make a move."
     }
 }

src/ui/flutter_app/lib/l10n/intl_lt.arb

@@ -1200,5 +1200,13 @@
     "algorithm": "Algoritmas",
     "@algorithm": {
         "description": "Algorithm"
+    },
+    "removeUnplacedPiece": "Pašalinkite neįdėtą gabalą",
+    "@removeUnplacedPiece": {
+        "description": "Remove unplaced piece"
+    },
+    "removeUnplacedPiece_Detail": "Jei žaidėjas suformuoja malūną dėjimo stadijoje, ji pašalina priešininko nepadėtą figūrą ir toliau daro ėjimą.",
+    "@removeUnplacedPiece_Detail": {
+        "description": "If a player forms the mill in the placing phase, she will remove the opponent's unplaced piece and continue to make a move."
     }
 }

src/ui/flutter_app/lib/l10n/intl_lv.arb

@@ -1200,5 +1200,13 @@
     "algorithm": "Algoritms",
     "@algorithm": {
         "description": "Algorithm"
+    },
+    "removeUnplacedPiece": "Noņemiet neizvietoto gabalu",
+    "@removeUnplacedPiece": {
+        "description": "Remove unplaced piece"
+    },
+    "removeUnplacedPiece_Detail": "Ja spēlētājs ievieto dzirnavas ievietošanas fāzē, viņa noņem pretinieka nenovietoto gabalu un turpina gājienu.",
+    "@removeUnplacedPiece_Detail": {
+        "description": "If a player forms the mill in the placing phase, she will remove the opponent's unplaced piece and continue to make a move."
     }
 }

src/ui/flutter_app/lib/l10n/intl_mk.arb

@@ -1200,5 +1200,13 @@
     "algorithm": "Алгоритам",
     "@algorithm": {
         "description": "Algorithm"
+    },
+    "removeUnplacedPiece": "Отстранете го непоставеното парче",
+    "@removeUnplacedPiece": {
+        "description": "Remove unplaced piece"
+    },
+    "removeUnplacedPiece_Detail": "Ако играчот ја формира воденицата во фазата на пласман, таа ќе го отстрани непласираното парче на противничката и ќе продолжи да прави потег.",
+    "@removeUnplacedPiece_Detail": {
+        "description": "If a player forms the mill in the placing phase, she will remove the opponent's unplaced piece and continue to make a move."
     }
 }

src/ui/flutter_app/lib/l10n/intl_ms.arb

@@ -1200,5 +1200,13 @@
     "algorithm": "Algoritma",
     "@algorithm": {
         "description": "Algorithm"
+    },
+    "removeUnplacedPiece": "Tanggalkan kepingan yang tidak diletak",
+    "@removeUnplacedPiece": {
+        "description": "Remove unplaced piece"
+    },
+    "removeUnplacedPiece_Detail": "Sekiranya pemain membentuk kilang dalam fasa penempatan, dia akan mengeluarkan bahagian lawan yang tidak ditempatkan dan terus bergerak.",
+    "@removeUnplacedPiece_Detail": {
+        "description": "If a player forms the mill in the placing phase, she will remove the opponent's unplaced piece and continue to make a move."
     }
 }

src/ui/flutter_app/lib/l10n/intl_nl.arb

@@ -1200,5 +1200,13 @@
     "algorithm": "Algoritme",
     "@algorithm": {
         "description": "Algorithm"
+    },
+    "removeUnplacedPiece": "Verwijder niet-geplaatst stuk",
+    "@removeUnplacedPiece": {
+        "description": "Remove unplaced piece"
+    },
+    "removeUnplacedPiece_Detail": "Als een speler de molen vormt in de plaatsingsfase, zal ze het niet-geplaatste stuk van de tegenstander verwijderen en doorgaan met een zet.",
+    "@removeUnplacedPiece_Detail": {
+        "description": "If a player forms the mill in the placing phase, she will remove the opponent's unplaced piece and continue to make a move."
     }
 }

src/ui/flutter_app/lib/l10n/intl_nn.arb

@@ -1200,5 +1200,13 @@
     "algorithm": "Algoritme",
     "@algorithm": {
         "description": "Algorithm"
+    },
+    "removeUnplacedPiece": "Fjern det uplasserte stykket",
+    "@removeUnplacedPiece": {
+        "description": "Remove unplaced piece"
+    },
+    "removeUnplacedPiece_Detail": "Hvis en spiller danner møllen i plasseringsfasen, vil hun fjerne motstanderens uplasserte brikke og fortsette å gjøre et trekk.",
+    "@removeUnplacedPiece_Detail": {
+        "description": "If a player forms the mill in the placing phase, she will remove the opponent's unplaced piece and continue to make a move."
     }
 }

src/ui/flutter_app/lib/l10n/intl_pl.arb

@@ -1200,5 +1200,13 @@
     "algorithm": "Algorytm",
     "@algorithm": {
         "description": "Algorithm"
+    },
+    "removeUnplacedPiece": "Usuń nieumieszczony kawałek",
+    "@removeUnplacedPiece": {
+        "description": "Remove unplaced piece"
+    },
+    "removeUnplacedPiece_Detail": "Jeśli gracz utworzy młyn w fazie układania, usunie nieumieszczony pion przeciwnika i kontynuuje ruch.",
+    "@removeUnplacedPiece_Detail": {
+        "description": "If a player forms the mill in the placing phase, she will remove the opponent's unplaced piece and continue to make a move."
     }
 }

src/ui/flutter_app/lib/l10n/intl_pt.arb

@@ -1200,5 +1200,13 @@
     "algorithm": "Algoritmo",
     "@algorithm": {
         "description": "Algorithm"
+    },
+    "removeUnplacedPiece": "Remova a peça não colocada",
+    "@removeUnplacedPiece": {
+        "description": "Remove unplaced piece"
+    },
+    "removeUnplacedPiece_Detail": "Se um jogador formar o moinho na fase de colocação, ele removerá a peça não colocada do oponente e continuará a fazer um movimento.",
+    "@removeUnplacedPiece_Detail": {
+        "description": "If a player forms the mill in the placing phase, she will remove the opponent's unplaced piece and continue to make a move."
     }
 }

src/ui/flutter_app/lib/l10n/intl_ro.arb

@@ -1200,5 +1200,13 @@
     "algorithm": "Algoritm",
     "@algorithm": {
         "description": "Algorithm"
+    },
+    "removeUnplacedPiece": "Îndepărtați piesa neplasată",
+    "@removeUnplacedPiece": {
+        "description": "Remove unplaced piece"
+    },
+    "removeUnplacedPiece_Detail": "Dacă un jucător formează moara în faza de plasare, va elimina piesa neplasată a adversarului și va continua să facă o mișcare.",
+    "@removeUnplacedPiece_Detail": {
+        "description": "If a player forms the mill in the placing phase, she will remove the opponent's unplaced piece and continue to make a move."
     }
 }

src/ui/flutter_app/lib/l10n/intl_ru.arb

@@ -1200,5 +1200,13 @@
     "algorithm": "Алгоритм",
     "@algorithm": {
         "description": "Algorithm"
+    },
+    "removeUnplacedPiece": "Удалить неразмещенный кусок",
+    "@removeUnplacedPiece": {
+        "description": "Remove unplaced piece"
+    },
+    "removeUnplacedPiece_Detail": "Если игрок формирует мельницу в фазе размещения, он удалит неразмещенную фишку противника и продолжит движение.",
+    "@removeUnplacedPiece_Detail": {
+        "description": "If a player forms the mill in the placing phase, she will remove the opponent's unplaced piece and continue to make a move."
     }
 }

src/ui/flutter_app/lib/l10n/intl_sk.arb

@@ -1200,5 +1200,13 @@
     "algorithm": "Algoritmus",
     "@algorithm": {
         "description": "Algorithm"
+    },
+    "removeUnplacedPiece": "Odstráňte neuložený kus",
+    "@removeUnplacedPiece": {
+        "description": "Remove unplaced piece"
+    },
+    "removeUnplacedPiece_Detail": "Ak hráč formuje mlyn vo fáze kladenia, odstráni súperovo neumiestnené miesto a pokračuje v ťahu.",
+    "@removeUnplacedPiece_Detail": {
+        "description": "If a player forms the mill in the placing phase, she will remove the opponent's unplaced piece and continue to make a move."
     }
 }

src/ui/flutter_app/lib/l10n/intl_sl.arb

@@ -1200,5 +1200,13 @@
     "algorithm": "Algoritem",
     "@algorithm": {
         "description": "Algorithm"
+    },
+    "removeUnplacedPiece": "Odstranite nenastavljen kos",
+    "@removeUnplacedPiece": {
+        "description": "Remove unplaced piece"
+    },
+    "removeUnplacedPiece_Detail": "Če igralec v fazi postavitve oblikuje mlin, bo odstranil nasprotnikov nezameščen kos in nadaljeval s potezo.",
+    "@removeUnplacedPiece_Detail": {
+        "description": "If a player forms the mill in the placing phase, she will remove the opponent's unplaced piece and continue to make a move."
     }
 }

src/ui/flutter_app/lib/l10n/intl_sq.arb

@@ -1200,5 +1200,13 @@
     "algorithm": "Algoritmi",
     "@algorithm": {
         "description": "Algorithm"
+    },
+    "removeUnplacedPiece": "Hiqni copën e pavendosur",
+    "@removeUnplacedPiece": {
+        "description": "Remove unplaced piece"
+    },
+    "removeUnplacedPiece_Detail": "Nëse një lojtar formon mullirin në fazën e vendosjes, ajo do të heqë pjesën e pavendosur të kundërshtarit dhe do të vazhdojë të bëjë një lëvizje.",
+    "@removeUnplacedPiece_Detail": {
+        "description": "If a player forms the mill in the placing phase, she will remove the opponent's unplaced piece and continue to make a move."
     }
 }

src/ui/flutter_app/lib/l10n/intl_sr.arb

@@ -1200,5 +1200,13 @@
     "algorithm": "Алгоритам",
     "@algorithm": {
         "description": "Algorithm"
+    },
+    "removeUnplacedPiece": "Уклоните непостављени комад",
+    "@removeUnplacedPiece": {
+        "description": "Remove unplaced piece"
+    },
+    "removeUnplacedPiece_Detail": "Ако играч формира воденицу у фази постављања, она ће уклонити противников незамењени део и наставити да прави потез.",
+    "@removeUnplacedPiece_Detail": {
+        "description": "If a player forms the mill in the placing phase, she will remove the opponent's unplaced piece and continue to make a move."
     }
 }

src/ui/flutter_app/lib/l10n/intl_sv.arb

@@ -1200,5 +1200,13 @@
     "algorithm": "Algoritm",
     "@algorithm": {
         "description": "Algorithm"
+    },
+    "removeUnplacedPiece": "Ta bort oplacerad bit",
+    "@removeUnplacedPiece": {
+        "description": "Remove unplaced piece"
+    },
+    "removeUnplacedPiece_Detail": "Om en spelare bildar kvarnen i placeringsfasen, tar hon bort motståndarens oplacerade bit och fortsätter att göra ett drag.",
+    "@removeUnplacedPiece_Detail": {
+        "description": "If a player forms the mill in the placing phase, she will remove the opponent's unplaced piece and continue to make a move."
     }
 }

src/ui/flutter_app/lib/l10n/intl_te.arb

@@ -1200,5 +1200,13 @@
     "algorithm": "అల్గోరిథం",
     "@algorithm": {
         "description": "Algorithm"
+    },
+    "removeUnplacedPiece": "ఉంచని భాగాన్ని తొలగించండి",
+    "@removeUnplacedPiece": {
+        "description": "Remove unplaced piece"
+    },
+    "removeUnplacedPiece_Detail": "ప్లేసింగ్ ఉంచే దశలో ఒక క్రీడాకారుడు మిల్లును ఏర్పాటు చేస్తే, ఆమె ప్రత్యర్థి యొక్క అన్‌ప్లాస్డ్ భాగాన్ని తీసివేసి, ఒక కదలికను కొనసాగిస్తుంది.",
+    "@removeUnplacedPiece_Detail": {
+        "description": "If a player forms the mill in the placing phase, she will remove the opponent's unplaced piece and continue to make a move."
     }
 }

src/ui/flutter_app/lib/l10n/intl_th.arb

@@ -1200,5 +1200,13 @@
     "algorithm": "อัลกอริทึม",
     "@algorithm": {
         "description": "Algorithm"
+    },
+    "removeUnplacedPiece": "ถอดชิ้นส่วนที่ไม่ได้วาง",
+    "@removeUnplacedPiece": {
+        "description": "Remove unplaced piece"
+    },
+    "removeUnplacedPiece_Detail": "หากผู้เล่นสร้างโรงสีในขั้นตอนการวาง เธอจะถอดชิ้นส่วนที่ไม่ได้วางของคู่ต่อสู้ออกและทำการเคลื่อนไหวต่อไป",
+    "@removeUnplacedPiece_Detail": {
+        "description": "If a player forms the mill in the placing phase, she will remove the opponent's unplaced piece and continue to make a move."
     }
 }

src/ui/flutter_app/lib/l10n/intl_tr.arb

@@ -1200,5 +1200,13 @@
     "algorithm": "algoritma",
     "@algorithm": {
         "description": "Algorithm"
+    },
+    "removeUnplacedPiece": "Yerleştirilmemiş parçayı kaldır",
+    "@removeUnplacedPiece": {
+        "description": "Remove unplaced piece"
+    },
+    "removeUnplacedPiece_Detail": "Bir oyuncu değirmeni yerleştirme aşamasında oluşturursa, rakibin yerleştirilmemiş taşını kaldıracak ve hamle yapmaya devam edecektir.",
+    "@removeUnplacedPiece_Detail": {
+        "description": "If a player forms the mill in the placing phase, she will remove the opponent's unplaced piece and continue to make a move."
     }
 }

src/ui/flutter_app/lib/l10n/intl_uz.arb

@@ -1200,5 +1200,13 @@
     "algorithm": "Algoritm",
     "@algorithm": {
         "description": "Algorithm"
+    },
+    "removeUnplacedPiece": "O'rnatilmagan qismni olib tashlang",
+    "@removeUnplacedPiece": {
+        "description": "Remove unplaced piece"
+    },
+    "removeUnplacedPiece_Detail": "Agar o'yinchi joylashtirish bosqichida tegirmonni hosil qilsa, u raqibning joylanmagan qismini olib tashlaydi va harakatni davom ettiradi.",
+    "@removeUnplacedPiece_Detail": {
+        "description": "If a player forms the mill in the placing phase, she will remove the opponent's unplaced piece and continue to make a move."
     }
 }

src/ui/flutter_app/lib/l10n/intl_vi.arb

@@ -1200,5 +1200,13 @@
     "algorithm": "Thuật toán",
     "@algorithm": {
         "description": "Algorithm"
+    },
+    "removeUnplacedPiece": "Loại bỏ mảnh không có vị trí",
+    "@removeUnplacedPiece": {
+        "description": "Remove unplaced piece"
+    },
+    "removeUnplacedPiece_Detail": "Nếu một người chơi hình thành cối xay trong giai đoạn đặt, cô ấy sẽ loại bỏ quân cờ của đối thủ và tiếp tục di chuyển.",
+    "@removeUnplacedPiece_Detail": {
+        "description": "If a player forms the mill in the placing phase, she will remove the opponent's unplaced piece and continue to make a move."
     }
 }

src/ui/flutter_app/lib/l10n/intl_zh.arb

@@ -1200,5 +1200,13 @@
     "algorithm": "算法",
     "@algorithm": {
         "description": "Algorithm"
+    },
+    "removeUnplacedPiece": "只能吃掉未摆的子",
+    "@removeUnplacedPiece": {
+        "description": "Remove unplaced piece"
+    },
+    "removeUnplacedPiece_Detail": "当形成三连时，只能吃掉对手未摆的棋子并继续行棋。",
+    "@removeUnplacedPiece_Detail": {
+        "description": "If a player forms the mill in the placing phase, she will remove the opponent's unplaced piece and continue to make a move."
     }
 }

src/ui/flutter_app/lib/l10n/intl_zh_Hant.arb

@@ -1200,5 +1200,13 @@
     "algorithm": "算法",
     "@algorithm": {
         "description": "Algorithm"
+    },
+    "removeUnplacedPiece": "只能吃掉未擺的子",
+    "@removeUnplacedPiece": {
+        "description": "Remove unplaced piece"
+    },
+    "removeUnplacedPiece_Detail": "當形成三連時，只能吃掉對手未擺的棋子並繼續行棋。",
+    "@removeUnplacedPiece_Detail": {
+        "description": "If a player forms the mill in the placing phase, she will remove the opponent's unplaced piece and continue to make a move."
     }
 }

src/ui/flutter_app/lib/mill/position.dart

@@ -522,7 +522,37 @@ class Position {
       } else {
         pieceToRemoveCount = rule.mayRemoveMultiple ? n : 1;
         updateKeyMisc();
-        action = Act.remove;
+
+        if (rule.mayOnlyRemoveUnplacedPieceInPlacingPhase &&
+            pieceInHandCount[them] != null) {
+          pieceInHandCount[them] =
+              pieceInHandCount[them]! - 1; // Or pieceToRemoveCount?
+
+          if (pieceInHandCount[them]! < 0) {
+            pieceInHandCount[them] = 0;
+          }
+
+          if (pieceInHandCount[PieceColor.white] == 0 &&
+              pieceInHandCount[PieceColor.black] == 0) {
+            if (checkIfGameIsOver()) {
+              return true;
+            }
+
+            phase = Phase.moving;
+            action = Act.select;
+
+            if (rule.isDefenderMoveFirst) {
+              changeSideToMove();
+            }
+
+            if (checkIfGameIsOver()) {
+              return true;
+            }
+          }
+        } else {
+          action = Act.remove;
+        }
+
         Game.instance.focusIndex = squareToIndex[s] ?? invalidIndex;
         Audios.playTone(Audios.millSoundId);
       }

src/ui/flutter_app/lib/mill/rule.dart

@@ -30,6 +30,7 @@ class Rule {
   bool isDefenderMoveFirst = false;
   bool mayRemoveMultiple = false;
   bool mayRemoveFromMillsAlways = false;
+  bool mayOnlyRemoveUnplacedPieceInPlacingPhase = false;
   bool isWhiteLoseButNotDrawWhenBoardFull = true;
   bool isLoseButNotChangeSideWhenNoWay = true;
   bool mayFly = true;

src/ui/flutter_app/lib/widgets/game_page.dart

@@ -263,10 +263,14 @@ class _GamePageState extends State<GamePage>
               if (Game.instance.engineType == EngineType.humanVsAi && mounted) {
                 showTip(S.of(context).tipPlaced);
               } else if (mounted) {
-                var side = Game.instance.sideToMove == PieceColor.white
-                    ? S.of(context).black
-                    : S.of(context).white;
-                showTip(side + S.of(context).tipToMove);
+                if (rule.mayOnlyRemoveUnplacedPieceInPlacingPhase) {
+                  showTip(S.of(context).tipPlaced); // TODO: Change tip
+                } else {
+                  var side = Game.instance.sideToMove == PieceColor.white
+                      ? S.of(context).black
+                      : S.of(context).white;
+                  showTip(side + S.of(context).tipToMove);
+                }
               }
             }
             ret = true;

src/ui/flutter_app/lib/widgets/rule_settings_page.dart

@@ -109,6 +109,14 @@ class _RuleSettingsPageState extends State<RuleSettingsPage> {
             subtitleString:
                 S.of(context).isWhiteLoseButNotDrawWhenBoardFull_Detail,
           ),
+          ListItemDivider(),
+          SettingsSwitchListTile(
+            context: context,
+            value: Config.mayOnlyRemoveUnplacedPieceInPlacingPhase,
+            onChanged: setMayOnlyRemoveUnplacedPieceInPlacingPhase,
+            titleString: S.of(context).removeUnplacedPiece,
+            subtitleString: S.of(context).removeUnplacedPiece_Detail,
+          ),
         ],
       ),
       SizedBox(height: AppTheme.sizedBoxHeight),
@@ -402,6 +410,17 @@ class _RuleSettingsPageState extends State<RuleSettingsPage> {
     Config.save();
   }
 
+  setMayOnlyRemoveUnplacedPieceInPlacingPhase(bool value) async {
+    setState(() {
+      rule.mayOnlyRemoveUnplacedPieceInPlacingPhase =
+          Config.mayOnlyRemoveUnplacedPieceInPlacingPhase = value;
+    });
+
+    print("[config] rule.mayOnlyRemoveUnplacedPieceInPlacingPhase: $value");
+
+    Config.save();
+  }
+
   // Moving
 
   setMayMoveInPlacingPhase(bool value) async {