From: Benjamin Auder <benjamin.auder@somewhere>
Date: Mon, 30 Mar 2020 21:34:05 +0000 (+0200)
Subject: Clarify Synchrone rules
X-Git-Url: https://git.auder.net/doc/html/index.html?a=commitdiff_plain;h=d448f93296ce2a4fcc6f2fbb959ec2485e172432;p=vchess.git

Clarify Synchrone rules
---

diff --git a/client/src/translations/rules/Synchrone/en.pug b/client/src/translations/rules/Synchrone/en.pug
index 3344652e..b72064b4 100644
--- a/client/src/translations/rules/Synchrone/en.pug
+++ b/client/src/translations/rules/Synchrone/en.pug
@@ -24,6 +24,17 @@ figure.diagram-container
     | fen:rnb1kbnr/ppp1pppp/8/3qP3/8/8/PPPP1PPP/RNBQKBNR:
   figcaption After 1.e4 d5 2.e5 Qxd5 (anticipating 2.exd5 which isn't played)
 
+p.
+  When the king is under check, a legal orthodox move must be played.
+  Some weird situations would occur otherwise, like on the following diagram.
+  If we allow self-(re)captures then the king would take on h2 and escape to
+  the third rank.
+
+figure.diagram-container
+  .diagram
+    | fen:7k/8/8/3QR3/3P4/4P3/r6P/q6K:
+  figcaption 1.Kxh2 by anticipation isn't allowed: white is checkmated.
+
 h3 End of the game
 
 p.
diff --git a/client/src/translations/rules/Synchrone/es.pug b/client/src/translations/rules/Synchrone/es.pug
index 1a98c95d..d9963a21 100644
--- a/client/src/translations/rules/Synchrone/es.pug
+++ b/client/src/translations/rules/Synchrone/es.pug
@@ -25,6 +25,17 @@ figure.diagram-container
     | fen:rnb1kbnr/ppp1pppp/8/3qP3/8/8/PPPP1PPP/RNBQKBNR:
   figcaption Después de 1.e4 d5 2.e5 Qxd5 (anticipando 2.exd5 que no se juega)
 
+p.
+  Cuando el rey está en jaque, un movimiento legal de acuerdo con las reglas
+  ortodoxas debe ser jugado. Situaciones extrañas pueden ocurrir de otra
+  manera, como en el siguiente diagrama. Si permitimos las auto-(re)capturas,
+  entonces el rey toma en h2 y escapa por la tercera fila.
+
+figure.diagram-container
+  .diagram
+    | fen:7k/8/8/3QR3/3P4/4P3/r6P/q6K:
+  figcaption 1.Kxh2 por adelantado no está permitido: las blancas son mate.
+
 h3 Fin de la partida
 
 p.
diff --git a/client/src/translations/rules/Synchrone/fr.pug b/client/src/translations/rules/Synchrone/fr.pug
index df48a123..f60ff48d 100644
--- a/client/src/translations/rules/Synchrone/fr.pug
+++ b/client/src/translations/rules/Synchrone/fr.pug
@@ -25,6 +25,17 @@ figure.diagram-container
     | fen:rnb1kbnr/ppp1pppp/8/3qP3/8/8/PPPP1PPP/RNBQKBNR:
   figcaption Après 1.e4 d5 2.e5 Qxd5 (anticipant 2.exd5 qui n'est pas joué)
 
+p.
+  Quand le roi est en échec, un coup légal selon les règles orthodoxes doit
+  être joué. Des situations bizarres peuvent arriver sinon, comme sur le
+  diagramme suivant. Si on autorise les auto-(re)captures alors le roi prend
+  en h2 et s'échappe par la troisème rangée.
+
+figure.diagram-container
+  .diagram
+    | fen:7k/8/8/3QR3/3P4/4P3/r6P/q6K:
+  figcaption 1.Kxh2 par anticipation n'est pas autorisé : les blancs sont mat.
+
 h3 Fin de la partie
 
 p.
diff --git a/client/src/variants/Synchrone.js b/client/src/variants/Synchrone.js
index 1af9379f..70afa0e5 100644
--- a/client/src/variants/Synchrone.js
+++ b/client/src/variants/Synchrone.js
@@ -107,11 +107,11 @@ export class SynchroneRules extends ChessRules {
   }
 
   getPossibleMovesFrom([x, y]) {
-    return (
-      this.filterValid(super.getPotentialMovesFrom([x, y]))
-      // Augment with potential recaptures:
-      .concat(this.getRecaptures([x, y]))
-    );
+    let moves = this.filterValid(super.getPotentialMovesFrom([x, y]));
+    if (!this.underCheck(this.getColor(x, y)))
+      // Augment with potential recaptures, except if we are under check
+      Array.prototype.push.apply(moves, this.getRecaptures([x, y]));
+    return moves;
   }
 
   // Aux function used to find opponent and self captures