Add Alapo, Crossing, Kingsmaker, Squatter variants

[vchess.git] / client / src / variants / Crossing.js

diff --git a/client/src/variants/Crossing.js b/client/src/variants/Crossing.js
new file mode 100644 (file)
index 0000000..4090746
--- /dev/null
+++ b/client/src/variants/Crossing.js
@@ -0,0 +1,30 @@
+import { ChessRules } from "@/base_rules";
+
+export class CrossingRules extends ChessRules {
+
+  static get Lines() {
+    return [ [[4, 0], [4, 8]] ];
+  }
+
+  getCurrentScore() {
+    // Turn has changed:
+    const color = V.GetOppCol(this.turn);
+    const secondHalf = (color == 'w' ? [0, 1, 2, 3] : [4, 5, 6, 7]);
+    if (secondHalf.includes(this.kingPos[color][0]))
+      // Half-board is crossed
+      return color == "w" ? "1-0" : "0-1";
+    return super.getCurrentScore();
+  }
+
+  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["b"][0] - 3.5)
+    );
+  }
+
+};