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Bishop Pawns based on Files #3194

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Bishop Pawns based on Files #3194

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db5a709
Update evaluate.cpp
FauziAkram Oct 23, 2020
5725b55
Update AUTHORS
FauziAkram Oct 23, 2020
78fa1f7
Bench:4067106
FauziAkram Oct 23, 2020
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8 changes: 6 additions & 2 deletions src/evaluate.cpp
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Expand Up @@ -221,6 +221,11 @@ namespace {
S( 74,147), S( 76,149), S( 90,153), S(104,169), S(105,171), S(106,171),
S(112,178), S(114,185), S(114,187), S(119,221) }
};

// A description of BishopPawns[distance from edge] to be inserted here
constexpr Score BishopPawns[int(FILE_NB) / 2] = {
S(3, 8), S(3, 9), S(1, 8), S(3, 7)
};

// KingProtector[knight/bishop] contains penalty for each distance unit to own king
constexpr Score KingProtector[] = { S(8, 9), S(6, 9) };
Expand Down Expand Up @@ -252,7 +257,6 @@ namespace {
// Assorted bonuses and penalties
constexpr Score BadOutpost = S( -7, 36);
constexpr Score BishopOnKingRing = S( 24, 0);
constexpr Score BishopPawns = S( 3, 7);
constexpr Score BishopXRayPawns = S( 4, 5);
constexpr Score CorneredBishop = S( 50, 50);
constexpr Score FlankAttacks = S( 8, 0);
Expand Down Expand Up @@ -453,7 +457,7 @@ namespace {
// when the bishop is outside the pawn chain.
Bitboard blocked = pos.pieces(Us, PAWN) & shift<Down>(pos.pieces());

score -= BishopPawns * pos.pawns_on_same_color_squares(Us, s)
score -= BishopPawns[edge_distance(file_of(s))] * pos.pawns_on_same_color_squares(Us, s)
* (!(attackedBy[Us][PAWN] & s) + popcount(blocked & CenterFiles));

// Penalty for all enemy pawns x-rayed
Expand Down