kate/BadFish
1
0
Fork 0
mirror of https://github.com/sockspls/badfish synced 2025-07-11 19:49:14 +00:00
Code Issues Releases Wiki Activity

Pieces protecting king

Browse source 
Initial protective idea by Snicolet for knight, for other pieces too
Patch add penalties and bonuses for pieces, depending on the distance from the own king

STC:
LLR: 2.95 (-2.94,2.94) [0.00,5.00]
Total: 21192 W: 3919 L: 3704 D: 13569

LTC:
LLR: 2.96 (-2.94,2.94) [0.00,5.00]
Total: 26177 W: 3642 L: 3435 D: 19100

Bench : 6687377

Closes #1012
This commit is contained in:
GuardianRM 2017-02-23 21:26:59 -08:00 • committed by Joona Kiiski
parent eefbe967c2
commit 9f48e1ec15
1 changed files with 13 additions and 0 deletions
Show stats Download patch file Download diff file Expand all files Collapse all files

13
src/evaluate.cpp
View file

@ -180,6 +180,16 @@ namespace {
S( 9, 10), S( 2, 10), S( 1, -8), S(-20,-12),
S(-20,-12), S( 1, -8), S( 2, 10), S( 9, 10)
};
// Protector[PieceType][distance] contains a protecting bonus for our king,
// indexed by piece type and distance between the piece and the king.
const Score Protector[PIECE_TYPE_NB][8] = {
{}, {},
{ S(0, 0), S( 7, 9), S( 7, 1), S( 1, 5), S(-10,-4), S( -1,-4), S( -7,-3), S(-16,-10) }, // Knight
{ S(0, 0), S(11, 8), S(-7,-1), S(-1,-2), S( -1,-7), S(-11,-3), S( -9,-1), S(-16, -1) }, // Bishop
{ S(0, 0), S(10, 0), S(-2, 2), S(-5, 4), S( -6, 2), S(-14,-3), S( -2,-9), S(-12, -7) }, // Rook
{ S(0, 0), S( 3,-5), S( 2,-5), S(-4, 0), S( -9,-6), S(-4, 7), S(-13,-7), S(-10, -7) } // Queen
};
// Assorted bonuses and penalties used by evaluation
const Score MinorBehindPawn = S(16, 0);
@ -294,6 +304,9 @@ namespace {
int mob = popcount(b & ei.mobilityArea[Us]);
mobility[Us] += MobilityBonus[Pt][mob];
// Bonus for this piece as a king protector
score += Protector[Pt][distance(s, pos.square<KING>(Us))];
if (Pt == BISHOP || Pt == KNIGHT)
{