Add Hamilton Chess

diff --git a/TODO b/TODO
index 293d78a..cfc62fc 100644 (file)
--- a/TODO
+++ b/TODO
@@ -1,8 +1,7 @@
 Chakart :)
+https://www.chessvariants.com/d.betza/chessvar/trapdoor.html
 https://www.chessvariants.com/crossover.dir/koopachess.html
---> Can a stunned piece capture? Maybe not.
-Donkey pose une banane soit en début de coup soit à la fin, en diagonale, et explosion orthogonale.
-Wario pareil mais pose orthogonale et explosion diagonale.
+--> Can a stunned piece capture? Maybe not. ...recover? After 5 moves? Never?
 
 Diamond Chess [Rynd] (J. A.
 Porterfield Rynd, 1886)  --> Berolina2 ?
@@ -28,15 +27,6 @@ the NOST combination games. (Nost-algia
 150, also Nost-algia 112 ‘not seen’) 
 --> pourquoi pas, mais faudra pouvoir tracer des lignes sur plateau (Ball, Koth, Sittuyin, celle-là, Rococo)
 
-Contact (quoted by David Silverman, 1971).
-White puts a knight on any square of an empty
-chessboard. Black moves the knight and
-places a marker on the square vacated. Play
-alternates. The knight may only be moved to
-vacant squares. The object is to make the last
-move. The game can also be played with any
-of the other pieces. (Your Move)
-
 https://www.chessvariants.com/diffmove.dir/checkers.html --> move forward (Multhopp)
 in 1974 by Hans Multhopp
 https://www.chessvariants.com/diffmove.dir/checkers.html

diff --git a/client/public/images/pieces/Hamilton/hole.svg b/client/public/images/pieces/Hamilton/hole.svg
new file mode 100644 (file)
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+   id="path3750"
+   inkscape:connector-curvature="0" /></svg>
\ No newline at end of file

diff --git a/client/src/translations/en.js b/client/src/translations/en.js
index e9bd52c..520c482 100644 (file)
--- a/client/src/translations/en.js
+++ b/client/src/translations/en.js
@@ -233,5 +233,6 @@ export const translations = {
   "Two kings": "Two kings",
   "Two royal pieces": "Two royal pieces",
   "Unidentified pieces": "Unidentified pieces",
+  "Walk on a graph": "Walk on a graph",
   "White move twice": "White move twice"
 };

diff --git a/client/src/translations/es.js b/client/src/translations/es.js
index 27ad31c..f803df2 100644 (file)
--- a/client/src/translations/es.js
+++ b/client/src/translations/es.js
@@ -233,5 +233,6 @@ export const translations = {
   "Two kings": "Dos reyes",
   "Two royal pieces": "Dos piezas reales",
   "Unidentified pieces": "Piezas no identificadas",
+  "Walk on a graph": "Camino en un gráfico",
   "White move twice": "Las blancas juegan dos veces"
 };

diff --git a/client/src/translations/fr.js b/client/src/translations/fr.js
index 5d2ef3b..e73e2e5 100644 (file)
--- a/client/src/translations/fr.js
+++ b/client/src/translations/fr.js
@@ -233,5 +233,6 @@ export const translations = {
   "Two kings": "Deux rois",
   "Two royal pieces": "Deux pièces royales",
   "Unidentified pieces": "Pièces non identifiées",
+  "Walk on a graph": "Marche sur un graphe",
   "White move twice": "Les blancs jouent deux fois"
 };

diff --git a/client/src/translations/rules/Hamilton/en.pug b/client/src/translations/rules/Hamilton/en.pug
new file mode 100644 (file)
index 0000000..813c420
--- /dev/null
+++ b/client/src/translations/rules/Hamilton/en.pug
@@ -0,0 +1,27 @@
+p.boxed
+  | Click on an empty square to start the game.
+  | The first player unable to move the knight loses.
+
+p.
+  White puts a knight on any square of an empty chessboard.
+  Black moves the knight, and its initial square vanish:
+  the knight will no longer be able to land on that square.
+  Play alternates, always with the vanishing initial square condition.
+  The first player unable to make a move loses.
+
+figure.diagram-container
+  .diagram
+    | fen:3xx2x/1x1xNxx1/2xxxxxx/xxxxxx2/2xxxxx1/x1xxxx2/1xxxxx2/1x2xx2 g8,c8:
+  figcaption Ng8 wins, but Nc8 loses because it allows Na7.
+
+p
+  | Note about the name: when the game ends, the knight has walked on an 
+  a(href="https://en.wikipedia.org/wiki/Hamiltonian_path") Hamiltonian path
+  |  considering the subgraph formed by all the removed squares
+  | plus the final square.
+
+p
+  | Inventor: David Silverman (1971) according to 
+  a(href="https://www.jsbeasley.co.uk/encyc.htm")
+    | The Classified Encyclopedia of Chess Variants
+  | . The game idea is probably quite older.

diff --git a/client/src/translations/rules/Hamilton/es.pug b/client/src/translations/rules/Hamilton/es.pug
new file mode 100644 (file)
index 0000000..8acf042
--- /dev/null
+++ b/client/src/translations/rules/Hamilton/es.pug
@@ -0,0 +1,29 @@
+p.boxed
+  | Haz clic en una casilla vacía para comenzar el juego.
+  | El primer jugador que no puede mover al caballo ha perdido.
+
+p.
+  White pone el caballo en cualquier casilla de un tablero vacío.
+  Las negras mueven a este caballo, y su casilla inicial desaparece:
+  el caballo ya no puede llegar a este espacio.
+  El juego continúa, siempre con la condición de desaparezca de la casilla
+  inicial. El primer jugador que no puede ejecutar un movimiento ha perdido.
+
+figure.diagram-container
+  .diagram
+    | fen:3xx2x/1x1xNxx1/2xxxxxx/xxxxxx2/2xxxxx1/x1xxxx2/1xxxxx2/1x2xx2 g8,c8:
+  figcaption Ng8 gana, pero Nc8 pierde porque permite Na7.
+
+p
+  | Nota sobre el nombre: cuando termina el juego, el caballo ha caminado
+  | sobre un 
+  a(href="https://es.wikipedia.org/wiki/Camino_hamiltoniano")
+    | camino hamiltoniano
+  |  considerando el sub-gráfico que consiste en los cuadros eliminados y
+  | la casilla final.
+
+p
+  | Inventor: David Silverman (1971) después 
+  a(href="https://www.jsbeasley.co.uk/encyc.htm")
+    | The Classified Encyclopedia of Chess Variants
+  | . La idea del juego es probablemente más antigua.

diff --git a/client/src/translations/rules/Hamilton/fr.pug b/client/src/translations/rules/Hamilton/fr.pug
new file mode 100644 (file)
index 0000000..a369618
--- /dev/null
+++ b/client/src/translations/rules/Hamilton/fr.pug
@@ -0,0 +1,28 @@
+p.boxed
+  | Cliquez sur une case vide pour démarrer la partie.
+  | Le premier joueur incapable de déplacer le cavalier a perdu.
+
+p.
+  Les blancs posent le cavalier sur n'importe quelle case d'un échiquier vide.
+  Les noirs déplacent ce cavalier, et sa case de départ disparaît :
+  le cavalier ne pourra plus arriver sur cette case.
+  Le jeu continue, toujours avec la condition de disparition de la case
+  initiale. Le premier joueur ne pouvant effectuer un coup a perdu.
+
+figure.diagram-container
+  .diagram
+    | fen:3xx2x/1x1xNxx1/2xxxxxx/xxxxxx2/2xxxxx1/x1xxxx2/1xxxxx2/1x2xx2 g8,c8:
+  figcaption Ng8 gagne, mais Nc8 perd car cela permet Na7.
+
+p
+  | Note au sujet du nom : quand la partie s'achève, le cavalier s'est promené
+  | sur un 
+  a(href="https://fr.wikipedia.org/wiki/Graphe_hamiltonien") chemin hamiltonien
+  |  considérant le sous-graphe constitué des cases supprimées et de la
+  | case finale.
+
+p
+  | Inventeur : David Silverman (1971) d'après 
+  a(href="https://www.jsbeasley.co.uk/encyc.htm")
+    | The Classified Encyclopedia of Chess Variants
+  | . L'idée du jeu est probablement plus ancienne.

diff --git a/client/src/variants/Hamilton.js b/client/src/variants/Hamilton.js
new file mode 100644 (file)
index 0000000..8c3a1bd
--- /dev/null
+++ b/client/src/variants/Hamilton.js
@@ -0,0 +1,153 @@
+import { ChessRules, Move, PiPo } from "@/base_rules";
+import { randInt } from "@/utils/alea";
+
+export class HamiltonRules extends ChessRules {
+  static get HasFlags() {
+    return false;
+  }
+
+  static get HasEnpassant() {
+    return false;
+  }
+
+  static get HOLE() {
+    return "xx";
+  }
+
+  static board2fen(b) {
+    if (b[0] == 'x') return 'x';
+    return ChessRules.board2fen(b);
+  }
+
+  static fen2board(f) {
+    if (f == 'x') return V.HOLE;
+    return ChessRules.fen2board(f);
+  }
+
+  getPpath(b) {
+    if (b[0] == 'x') return "Hamilton/hole";
+    return b;
+  }
+
+  static get PIECES() {
+    return [ChessRules.KNIGHT];
+  }
+
+  static IsGoodPosition(position) {
+    if (position.length == 0) return false;
+    const rows = position.split("/");
+    if (rows.length != V.size.x) return false;
+    for (let row of rows) {
+      let sumElts = 0;
+      for (let i = 0; i < row.length; i++) {
+        if (['x'].concat(V.PIECES).includes(row[i].toLowerCase())) sumElts++;
+        else {
+          const num = parseInt(row[i]);
+          if (isNaN(num)) return false;
+          sumElts += num;
+        }
+      }
+      if (sumElts != V.size.y) return false;
+    }
+    return true;
+  }
+
+  static GenRandInitFen() {
+    return "8/8/8/8/8/8/8/8 w 0";
+  }
+
+  canIplay(side, [x, y]) {
+    return side == this.turn;
+  }
+
+  // Initiate the game by choosing a square for the knight:
+  doClick(square) {
+    if (this.movesCount > 0) return null;
+    return new Move({
+      appear: [
+        new PiPo({ x: square[0], y: square[1], c: 'w', p: V.KNIGHT })
+      ],
+      vanish: [],
+      start: { x: -1, y: -1 }
+    });
+  }
+
+  getAllPotentialMoves() {
+    if (this.movesCount == 0) {
+      return [...Array(64).keys()].map(k => {
+        const i = k % 8;
+        const j = (k - i) / 8;
+        return new Move({
+          appear: [
+            new PiPo({ x: i, y: j, c: 'w', p: V.KNIGHT })
+          ],
+          vanish: [],
+          start: { x: -1, y: -1 }
+        });
+      });
+    }
+    for (let i=0; i<8; i++) {
+      for (let j=0; j<8; j++) {
+        if (!([V.EMPTY, V.HOLE].includes(this.board[i][j])))
+          return this.getPotentialKnightMoves([i, j]);
+      }
+    }
+    return [];
+  }
+
+  getPotentialKnightMoves([x, y]) {
+    return (
+      V.steps[V.KNIGHT].filter(
+        s => {
+          const [i, j] = [x + s[0], y + s[1]];
+          return (V.OnBoard(i, j) && this.board[i][j] != V.HOLE);
+        }
+      ).map(s => {
+        return this.getBasicMove([x, y], [x + s[0], y + s[1]]);
+      })
+    );
+  }
+
+  atLeastOneMove() {
+    if (this.movesCount == 0) return true;
+    for (let i=0; i<8; i++) {
+      for (let j=0; j<8; j++) {
+        if (!([V.EMPTY, V.HOLE].includes(this.board[i][j])))
+          return this.getPotentialKnightMoves([i, j]).length > 0;
+      }
+    }
+    return false;
+  }
+
+  filterValid(moves) {
+    return moves;
+  }
+
+  static PlayOnBoard(board, move) {
+    if (move.vanish.length > 0)
+      board[move.vanish[0].x][move.vanish[0].y] = V.HOLE;
+    for (let psq of move.appear) board[psq.x][psq.y] = psq.c + psq.p;
+  }
+
+  getCheckSquares() {
+    return [];
+  }
+
+  getCurrentScore() {
+    if (this.atLeastOneMove()) return "*";
+    // No valid move: I lose
+    return this.turn == "w" ? "0-1" : "1-0";
+  }
+
+  getComputerMove() {
+    const moves = this.getAllValidMoves();
+    // Just a random mover for now...
+    return moves[randInt(moves.length)];
+  }
+
+  getNotation(move) {
+    if (move.vanish.length > 0) return super.getNotation(move);
+    // First game move:
+    return "N@" + V.CoordsToSquare(move.end);
+  }
+};

diff --git a/server/db/populate.sql b/server/db/populate.sql
index a347920..48f97c0 100644 (file)
--- a/server/db/populate.sql
+++ b/server/db/populate.sql
@@ -41,6 +41,7 @@ insert or ignore into Variants (name, description) values
   ('Extinction', 'Capture all of a kind'),
   ('Grand', 'Big board'),
   ('Grasshopper', 'Long jumps over pieces'),
+  ('Hamilton', 'Walk on a graph'),
   ('Horde', 'A pawns cloud'),
   ('Interweave', 'Interweaved colorbound teams'),
   ('Knightmate', 'Mate the knight'),