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@@ -5,6 +5,8 @@ WORKDIR /app
 # Install system dependencies
 RUN apt-get update && apt-get install -y --no-install-recommends \
     gcc \
+    curl \
+    unzip \
     && rm -rf /var/lib/apt/lists/*
 
 # Install moonfish from PyPI (includes chess dependency)
@@ -36,6 +38,14 @@ RUN MOONFISH_PATH=$(python -c "import moonfish; import os; print(os.path.dirname
     cp -r /tmp/rl/* ${MOONFISH_PATH}/rl/ && \
     rm -rf /tmp/rl
 
+# Download cerebellum opening book
+# Source: https://zipproth.de/Brainfish/download/
+RUN mkdir -p /app/opening_book && \
+    curl -L -o /tmp/cerebellum.zip "https://zipproth.de/Brainfish/Cerebellum_Light.zip" && \
+    unzip -j /tmp/cerebellum.zip "Cerebellum_Light.bin" -d /app/opening_book && \
+    mv /app/opening_book/Cerebellum_Light.bin /app/opening_book/cerebellum.bin && \
+    rm /tmp/cerebellum.zip
+
 # Expose port - HF Spaces expects 7860
 EXPOSE 7860