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  // for the given color. We have to provide the position in addition to the color
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  // for the given color. We have to provide the position in addition to the color
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  // because the scale factor may also be a function which should be applied to
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  // because the scale factor may also be a function which should be applied to
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  // the position. For instance, in KBP vs K endgames, the scaling function looks
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  // the position. For instance, in KBP vs K endgames, the scaling function looks
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  // for rook pawns and wrong-colored bishops.
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  // for rook pawns and wrong-colored bishops.
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  ScaleFactor scale_factor(const Position& pos, Color c) const {
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  ScaleFactor scale_factor(const Position& pos, Color c) const {
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    return   !scalingFunction[c]
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    ScaleFactor sf = scalingFunction[c] ? (*scalingFunction[c])(pos)
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          || (*scalingFunction[c])(pos) == SCALE_FACTOR_NONE ? ScaleFactor(factor[c])
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                                        :  SCALE_FACTOR_NONE;
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                                                             : (*scalingFunction[c])(pos);
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    return sf != SCALE_FACTOR_NONE ? sf : ScaleFactor(factor[c]);
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  }
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  }
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  Key key;
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  Key key;
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  int16_t value;
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  int16_t value;
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  uint8_t factor[COLOR_NB];
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  uint8_t factor[COLOR_NB];