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Outpost array simplification

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The ReachableOutpost values were almost exactly half the Outpost values.

Passed STC
http://tests.stockfishchess.org/tests/view/588020510ebc5915193f781e
LLR: 3.86 (-2.94,2.94) [-3.00,1.00]
Total: 119238 W: 21462 L: 21460 D: 76316

Passed LTC
http://tests.stockfishchess.org/tests/view/5880ae090ebc5915193f7843
LLR: 2.96 (-2.94,2.94) [-3.00,1.00]
Total: 23540 W: 3097 L: 2980 D: 17463

Curiously, using a division by 2, with slightly different values, did not passed
http://tests.stockfishchess.org/tests/view/587fece00ebc5915193f780a

bench: 5828283
This commit is contained in:
Alain SAVARD 2017-01-18 21:10:31 -05:00 • committed by Marco Costalba
parent 243a9f5484
commit 9eed183489
1 changed files with 8 additions and 14 deletions
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22
src/evaluate.cpp
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@ -135,19 +135,13 @@ namespace {
S(118,174), S(119,177), S(123,191), S(128,199) }
};
// Outpost[knight/bishop][supported by pawn] contains bonuses for knights and
// bishops outposts, bigger if outpost piece is supported by a pawn.
// Outpost[knight/bishop][supported by pawn] contains bonuses for minor
// pieces if they can reach an outpost square, bigger if that square is
// supported by a pawn. If the minor piece occupies an outpost square
// then score is doubled.
const Score Outpost[][2] = {
{ S(43,11), S(65,20) }, // Knights
{ S(20, 3), S(29, 8) } // Bishops
};
// ReachableOutpost[knight/bishop][supported by pawn] contains bonuses for
// knights and bishops which can reach an outpost square in one move, bigger
// if outpost square is supported by a pawn.
const Score ReachableOutpost[][2] = {
{ S(21, 5), S(35, 8) }, // Knights
{ S( 8, 0), S(14, 4) } // Bishops
{ S(22, 6), S(33, 9) }, // Knight
{ S( 9, 2), S(14, 4) } // Bishop
};
// RookOnFile[semiopen/open] contains bonuses for each rook when there is no
@ -316,12 +310,12 @@ namespace {
// Bonus for outpost squares
bb = OutpostRanks & ~ei.pe->pawn_attacks_span(Them);
if (bb & s)
score += Outpost[Pt == BISHOP][!!(ei.attackedBy[Us][PAWN] & s)];
score += Outpost[Pt == BISHOP][!!(ei.attackedBy[Us][PAWN] & s)] * 2;
else
{
bb &= b & ~pos.pieces(Us);
if (bb)
score += ReachableOutpost[Pt == BISHOP][!!(ei.attackedBy[Us][PAWN] & bb)];
score += Outpost[Pt == BISHOP][!!(ei.attackedBy[Us][PAWN] & bb)];
}
// Bonus when behind a pawn