X-Git-Url: https://git.auder.net/?a=blobdiff_plain;f=client%2Fsrc%2Fvariants%2FKoth.js;fp=client%2Fsrc%2Fvariants%2FKoth.js;h=e286862d9c360b8e8505a9ff1e1d4be4b5b5cbe6;hb=236485b53993f2adfd588022e2899a39491fc825;hp=0000000000000000000000000000000000000000;hpb=59e74176f5e2e828ce0b81c2ead6f8cdb0654f69;p=vchess.git

diff --git a/client/src/variants/Koth.js b/client/src/variants/Koth.js
new file mode 100644
index 00000000..e286862d
--- /dev/null
+++ b/client/src/variants/Koth.js
@@ -0,0 +1,48 @@
+import { ChessRules } from "@/base_rules";
+
+export class KothRules extends ChessRules {
+  filterValid(moves) {
+    if (moves.length == 0) return [];
+    const color = this.turn;
+    const oppCol = V.GetOppCol(color);
+    return moves.filter(m => {
+      this.play(m);
+      // Giving check is forbidden as well:
+      const res = !this.underCheck(color) && !this.underCheck(oppCol);
+      this.undo(m);
+      return res;
+    });
+  }
+
+  getCurrentScore() {
+    // Turn has changed:
+    const color = V.GetOppCol(this.turn);
+    if (
+      [3,4].includes(this.kingPos[color][0]) &&
+      [3,4].includes(this.kingPos[color][1])
+    ) {
+      // The middle is reached!
+      return color == "w" ? "1-0" : "0-1";
+    }
+    if (this.atLeastOneMove()) return "*";
+    // Stalemate (will probably never happen)
+    return "1/2";
+  }
+
+  evalPosition() {
+    // Count material:
+    let evaluation = super.evalPosition();
+    // Ponder with king position:
+    return (
+      evaluation/5 +
+      (
+        Math.abs(this.kingPos["w"][0] - 3.5) +
+        Math.abs(this.kingPos["w"][1] - 3.5)
+      ) / 2 -
+      (
+        Math.abs(this.kingPos["b"][0] - 3.5) +
+        Math.abs(this.kingPos["b"][1] - 3.5)
+      ) / 2
+    );
+  }
+};