From 151277524bf64453cd3107f32e5aa8c96cfb462b Mon Sep 17 00:00:00 2001
From: GuillaumeSD <gsd.lfny@gmail.com>
Date: Tue, 7 Jan 2025 00:03:00 +0100
Subject: [PATCH] fix : analysis with stalemate game

---
 src/lib/chess.ts            |  5 +++++
 src/lib/engine/uciEngine.ts | 18 +++++++++++++++++-
 2 files changed, 22 insertions(+), 1 deletion(-)

diff --git a/src/lib/chess.ts b/src/lib/chess.ts
index 1722e05..945d0d4 100644
--- a/src/lib/chess.ts
+++ b/src/lib/chess.ts
@@ -147,6 +147,11 @@ export const getEvaluationBarValue = (
   return { whiteBarPercentage, label };
 };
 
+export const getIsStalemate = (fen: string): boolean => {
+  const game = new Chess(fen);
+  return game.isStalemate();
+};
+
 export const getWhoIsCheckmated = (fen: string): "w" | "b" | null => {
   const game = new Chess(fen);
   if (!game.isCheckmate()) return null;
diff --git a/src/lib/engine/uciEngine.ts b/src/lib/engine/uciEngine.ts
index 7c2a41c..b3dc409 100644
--- a/src/lib/engine/uciEngine.ts
+++ b/src/lib/engine/uciEngine.ts
@@ -10,7 +10,7 @@ import {
   parseEvaluationResults,
 } from "./helpers/parseResults";
 import { computeAccuracy } from "./helpers/accuracy";
-import { getWhoIsCheckmated } from "../chess";
+import { getIsStalemate, getWhoIsCheckmated } from "../chess";
 import { getLichessEval } from "../lichess";
 import { getMovesClassification } from "./helpers/moveClassification";
 import { EngineWorker } from "@/types/engine";
@@ -158,6 +158,22 @@ export class UciEngine {
         });
         continue;
       }
+
+      const isStalemate = getIsStalemate(fen);
+      if (isStalemate) {
+        positions.push({
+          lines: [
+            {
+              pv: [],
+              depth: 0,
+              multiPv: 1,
+              cp: 0,
+            },
+          ],
+        });
+        continue;
+      }
+
       const result = await this.evaluatePosition(fen, depth);
       positions.push(result);
       setEvaluationProgress?.(