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struct TTEntry {
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struct TTEntry {
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  Move  move()  const { return (Move )move16; }
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  Move  move()  const { return (Move )move16; }
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  Value value() const { return (Value)value16; }
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  Value value() const { return (Value)value16; }
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  Value eval()  const { return (Value)eval16; }
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  Value eval()  const { return (Value)eval16; }
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  Depth depth() const { return (Depth)depth8; }
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  Depth depth() const { return (Depth)(depth8 * int(ONE_PLY)); }
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  Bound bound() const { return (Bound)(genBound8 & 0x3); }
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  Bound bound() const { return (Bound)(genBound8 & 0x3); }
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  void save(Key k, Value v, Bound b, Depth d, Move m, Value ev, uint8_t g) {
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  void save(Key k, Value v, Bound b, Depth d, Move m, Value ev, uint8_t g) {
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    assert(d / ONE_PLY * ONE_PLY == d);
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    // Preserve any existing move for the same position
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    // Preserve any existing move for the same position
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    if (m || (k >> 48) != key16)
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    if (m || (k >> 48) != key16)
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        move16 = (uint16_t)m;
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        move16 = (uint16_t)m;
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    // Don't overwrite more valuable entries
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    // Don't overwrite more valuable entries
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    if (  (k >> 48) != key16
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    if (  (k >> 48) != key16
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        || d > depth8 - 4
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        || d / ONE_PLY > depth8 - 4
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     /* || g != (genBound8 & 0xFC) // Matching non-zero keys are already refreshed by probe() */
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     /* || g != (genBound8 & 0xFC) // Matching non-zero keys are already refreshed by probe() */
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        || b == BOUND_EXACT)
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        || b == BOUND_EXACT)
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    {
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    {
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        key16     = (uint16_t)(k >> 48);
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        key16     = (uint16_t)(k >> 48);
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        value16   = (int16_t)v;
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        value16   = (int16_t)v;
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        eval16    = (int16_t)ev;
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        eval16    = (int16_t)ev;
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        genBound8 = (uint8_t)(g | b);
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        genBound8 = (uint8_t)(g | b);
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        depth8    = (int8_t)d;
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        depth8    = (int8_t)(d / ONE_PLY);
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    }
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    }
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  }
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  }
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private:
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private:
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  friend class TranspositionTable;
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  friend class TranspositionTable;