X-Git-Url: https://git.auder.net/?a=blobdiff_plain;f=client%2Fsrc%2Fbase_rules.js;h=52ec2c543d2de621b8c7d6fc0712d356f9a4bb72;hb=305ede7ec3753fc669b7c86af5b5c5b2fc78a164;hp=b83a409b8c37a98d6e366b959a1e64a3a56733cd;hpb=3f22c2c3939dfd6bd66da26e6d6d9848c6da86d2;p=vchess.git

diff --git a/client/src/base_rules.js b/client/src/base_rules.js
index b83a409b..52ec2c54 100644
--- a/client/src/base_rules.js
+++ b/client/src/base_rules.js
@@ -128,11 +128,11 @@ export const ChessRules = class ChessRules {
     if (position.length == 0) return false;
     const rows = position.split("/");
     if (rows.length != V.size.x) return false;
-    let kings = {};
+    let kings = { "k": 0, "K": 0 };
     for (let row of rows) {
       let sumElts = 0;
       for (let i = 0; i < row.length; i++) {
-        if (['K','k'].includes(row[i])) kings[row[i]] = true;
+        if (['K','k'].includes(row[i])) kings[row[i]]++;
         if (V.PIECES.includes(row[i].toLowerCase())) sumElts++;
         else {
           const num = parseInt(row[i]);
@@ -142,8 +142,8 @@ export const ChessRules = class ChessRules {
       }
       if (sumElts != V.size.y) return false;
     }
-    // Both kings should be on board:
-    if (Object.keys(kings).length != 2) return false;
+    // Both kings should be on board. Exactly one per color.
+    if (Object.values(kings).some(v => v != 1)) return false;
     return true;
   }
 
@@ -191,9 +191,9 @@ export const ChessRules = class ChessRules {
     return V.CoordToColumn(coords.y) + (V.size.x - coords.x);
   }
 
-  // Path to pieces
+  // Path to pieces (standard ones in pieces/ folder)
   getPpath(b) {
-    return b; //usual pieces in pieces/ folder
+    return b;
   }
 
   // Path to promotion pieces (usually the same)
@@ -367,6 +367,13 @@ export const ChessRules = class ChessRules {
 
   // Position part of the FEN string
   getBaseFen() {
+    const format = (count) => {
+      // if more than 9 consecutive free spaces, break the integer,
+      // otherwise FEN parsing will fail.
+      if (count <= 9) return count;
+      // Currently only boards of size up to 11 or 12:
+      return "9" + (count - 9);
+    };
     let position = "";
     for (let i = 0; i < V.size.x; i++) {
       let emptyCount = 0;
@@ -375,7 +382,7 @@ export const ChessRules = class ChessRules {
         else {
           if (emptyCount > 0) {
             // Add empty squares in-between
-            position += emptyCount;
+            position += format(emptyCount);
             emptyCount = 0;
           }
           position += V.board2fen(this.board[i][j]);
@@ -383,7 +390,7 @@ export const ChessRules = class ChessRules {
       }
       if (emptyCount > 0) {
         // "Flush remainder"
-        position += emptyCount;
+        position += format(emptyCount);
       }
       if (i < V.size.x - 1) position += "/"; //separate rows
     }
@@ -672,7 +679,8 @@ export const ChessRules = class ChessRules {
       enpassantMove.vanish.push({
         x: x,
         y: epSquare.y,
-        p: "p",
+        // Captured piece is usually a pawn, but next line seems harmless
+        p: this.getPiece(x, epSquare.y),
         c: this.getColor(x, epSquare.y)
       });
     }
@@ -1093,7 +1101,9 @@ export const ChessRules = class ChessRules {
     ) {
       const flagIdx = (move.start.y == this.castleFlags[c][0] ? 0 : 1);
       this.castleFlags[c][flagIdx] = V.size.y;
-    } else if (
+    }
+    // NOTE: not "else if" because a rook could take an opposing rook
+    if (
       move.end.x == oppFirstRank && //we took opponent rook?
       this.castleFlags[oppCol].includes(move.end.y)
     ) {
@@ -1187,7 +1197,7 @@ export const ChessRules = class ChessRules {
     return V.INFINITY;
   }
 
-  // Search depth: 2 for high branching factor, 4 for small (Loser chess, eg.)
+  // Search depth: 1,2 for high branching factor, 4 for small (Loser chess, eg.)
   static get SEARCH_DEPTH() {
     return 3;
   }