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Introducing King On File

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this new concept calculates bonuses/penalties for the king when the king is in a semiopen or open file.

Passed STC:
LLR: 2.95 (-2.94,2.94) {-0.25,1.25}
Total: 44904 W: 9365 L: 9028 D: 26511
Ptnml(0-2): 857, 5309, 9841, 5530, 915
https://tests.stockfishchess.org/tests/view/5fa343625d72639a7acef72b

Passed LTC:
LLR: 2.94 (-2.94,2.94) {0.25,1.25}
Total: 60552 W: 8449 L: 8051 D: 44052
Ptnml(0-2): 466, 5772, 17481, 6012, 545
https://tests.stockfishchess.org/tests/view/5fa40e365d72639a7acef79e

closes https://github.com/official-stockfish/Stockfish/pull/3219

Bench: 3689484
This commit is contained in:
FauziAkram 2020-11-05 01:54:53 +02:00 • committed by Joost VandeVondele
parent 04a320666e
commit 7fc47eeb6f
1 changed files with 16 additions and 8 deletions
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24
src/pawns.cpp
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@ -49,10 +49,10 @@ namespace {
// Strength of pawn shelter for our king by [distance from edge][rank].
// RANK_1 = 0 is used for files where we have no pawn, or pawn is behind our king.
constexpr Value ShelterStrength[int(FILE_NB) / 2][RANK_NB] = {
{ V( -6), V( 81), V( 93), V( 58), V( 39), V( 18), V( 25) },
{ V(-43), V( 61), V( 35), V(-49), V(-29), V(-11), V( -63) },
{ V(-10), V( 75), V( 23), V( -2), V( 32), V( 3), V( -45) },
{ V(-39), V(-13), V(-29), V(-52), V(-48), V(-67), V(-166) }
{ V( -5), V( 82), V( 92), V( 54), V( 36), V( 22), V( 28) },
{ V(-44), V( 63), V( 33), V(-50), V(-30), V(-12), V( -62) },
{ V(-11), V( 77), V( 22), V( -6), V( 31), V( 8), V( -45) },
{ V(-39), V(-12), V(-29), V(-50), V(-43), V(-68), V(-164) }
};
// Danger of enemy pawns moving toward our king by [distance from edge][rank].
@ -60,12 +60,17 @@ namespace {
// is behind our king. Note that UnblockedStorm[0][1-2] accommodate opponent pawn
// on edge, likely blocked by our king.
constexpr Value UnblockedStorm[int(FILE_NB) / 2][RANK_NB] = {
{ V( 85), V(-289), V(-166), V(97), V(50), V( 45), V( 50) },
{ V( 46), V( -25), V( 122), V(45), V(37), V(-10), V( 20) },
{ V( -6), V( 51), V( 168), V(34), V(-2), V(-22), V(-14) },
{ V(-15), V( -11), V( 101), V( 4), V(11), V(-15), V(-29) }
{ V( 87), V(-288), V(-168), V( 96), V( 47), V( 44), V( 46) },
{ V( 42), V( -25), V( 120), V( 45), V( 34), V( -9), V( 24) },
{ V( -8), V( 51), V( 167), V( 35), V( -4), V(-16), V(-12) },
{ V(-17), V( -13), V( 100), V( 4), V( 9), V(-16), V(-31) }
};
// KingOnFile[semi-open Us][semi-open Them] contains bonuses/penalties
// for king when the king is on a semi-open or open file.
constexpr Score KingOnFile[2][2] = {{ S(-19,12), S(-6, 7) },
{ S( 0, 2), S( 6,-5) }};
#undef S
#undef V
@ -237,6 +242,9 @@ Score Entry::evaluate_shelter(const Position& pos, Square ksq) const {
bonus -= make_score(UnblockedStorm[d][theirRank], 0);
}
// King On File
bonus -= KingOnFile[pos.is_on_semiopen_file(Us, ksq)][pos.is_on_semiopen_file(Them, ksq)];
return bonus;
}