X-Git-Url: https://git.auder.net/?a=blobdiff_plain;f=public%2Fjavascripts%2Fvariants%2FExtinction.js;fp=public%2Fjavascripts%2Fvariants%2FExtinction.js;h=db330d9e31e656d609586a8022e3424d9e776c1f;hb=a6abf094c35a26019e47fea21302c4be32ff030b;hp=0000000000000000000000000000000000000000;hpb=cf1303697774a12ef9bb154014a38797716944cf;p=vchess.git

diff --git a/public/javascripts/variants/Extinction.js b/public/javascripts/variants/Extinction.js
new file mode 100644
index 00000000..db330d9e
--- /dev/null
+++ b/public/javascripts/variants/Extinction.js
@@ -0,0 +1,86 @@
+class ExtinctionRules extends ChessRules
+{
+	initVariables(fen)
+	{
+		super.initVariables(fen);
+		const V = VariantRules;
+		this.material =
+		{
+			"w":
+			{
+				[V.KING]: 1,
+				[V.QUEEN]: 1,
+				[V.ROOK]: 2,
+				[V.KNIGHT]: 2,
+				[V.BISHOP]: 2,
+				[V.PAWN]: 8
+			},
+			"b":
+			{
+				[V.KING]: 1,
+				[V.QUEEN]: 1,
+				[V.ROOK]: 2,
+				[V.KNIGHT]: 2,
+				[V.BISHOP]: 2,
+				[V.PAWN]: 8
+			}
+		};
+	}
+
+	// TODO: verify this assertion
+	atLeastOneMove()
+	{
+		return true; //always at least one possible move
+	}
+
+	underCheck(move)
+	{
+		return false; //there is no check
+	}
+
+	getCheckSquares(move)
+	{
+		return [];
+	}
+
+	updateVariables(move)
+	{
+		super.updateVariables(move);
+		if (move.vanish.length==2 && move.appear.length==1)
+			this.material[move.vanish[1].c][move.vanish[1].p]--;
+	}
+
+	unupdateVariables(move)
+	{
+		super.unupdateVariables(move);
+		if (move.vanish.length==2 && move.appear.length==1)
+			this.material[move.vanish[1].c][move.vanish[1].p]++;
+	}
+
+	checkGameOver()
+	{
+		if (this.checkRepetition())
+			return "1/2";
+
+		if (this.atLeastOneMove()) // game not over?
+		{
+			const color = this.turn;
+			if (Object.keys(this.material[color]).some(
+				p => { return this.material[color][p] == 0; }))
+			{
+				return this.checkGameEnd();
+			}
+			return "*";
+		}
+
+		return this.checkGameEnd();
+	}
+
+	// Very negative (resp. positive) if white (reps. black) pieces set is incomplete
+	evalPosition()
+	{
+		if (this.missAkind())
+			return (this.turn=="w"?-1:1) * VariantRules.INFINITY;
+		return super.evalPosition();
+	}
+}