PV_CLEAR          107 src/search.cpp    PV_CLEAR(SearchBest->pv);
PV_CLEAR          380 src/search_full.cpp    PV_CLEAR(pv);
PV_CLEAR          602 src/search_full.cpp                   PV_CLEAR(pv);
PV_CLEAR          732 src/search_full.cpp    PV_CLEAR(pv);
PV_CLEAR          812 src/search_full.cpp    PV_CLEAR(pv);
PV_CLEAR          929 src/search_full.cpp                   PV_CLEAR(pv);