kate/BadFish
1
0
Fork 0
mirror of https://github.com/sockspls/badfish synced 2025-04-30 16:53:09 +00:00
Code Issues Releases Wiki Activity

Refactor king ring calculation

Browse source 
Compute the "double protection by pawns" expression only once
in initialize(), instead of once for each piece in the piece loop.

Passed STC
http://tests.stockfishchess.org/tests/view/5c1506380ebc5902ba11f3b4
LLR: 2.95 (-2.94,2.94) [-3.00,1.00]
Total: 9494 W: 2191 L: 2045 D: 5258

Inspired by Nick Pelling's test
   http://tests.stockfishchess.org/tests/view/5c144d110ebc5902ba11e4af
and an older test of mine
   http://tests.stockfishchess.org/tests/view/5c0402810ebc5902bcee1fc8

Non functional change.
This commit is contained in:
Alain SAVARD 2018-12-15 12:09:35 -05:00 • committed by Stéphane Nicolet
parent 4e2bb8fa44
commit 64a6138d37
1 changed files with 2 additions and 1 deletions
Show stats Download patch file Download diff file Expand all files Collapse all files

3
src/evaluate.cpp
View file

@ -274,6 +274,7 @@ namespace {
kingRing[Us] |= shift<EAST>(kingRing[Us]); kingRing[Us] |= shift<EAST>(kingRing[Us]);
kingAttackersCount[Them] = popcount(kingRing[Us] & pe->pawn_attacks(Them)); kingAttackersCount[Them] = popcount(kingRing[Us] & pe->pawn_attacks(Them));
kingRing[Us] &= ~double_pawn_attacks_bb<Us>(pos.pieces(Us, PAWN));
kingAttacksCount[Them] = kingAttackersWeight[Them] = 0; kingAttacksCount[Them] = kingAttackersWeight[Them] = 0;
} }
} }
@ -309,7 +310,7 @@ namespace {
attackedBy[Us][Pt] |= b; attackedBy[Us][Pt] |= b;
attackedBy[Us][ALL_PIECES] |= b; attackedBy[Us][ALL_PIECES] |= b;
if (b & kingRing[Them] & ~double_pawn_attacks_bb<Them>(pos.pieces(Them, PAWN))) if (b & kingRing[Them])
{ {
kingAttackersCount[Us]++; kingAttackersCount[Us]++;
kingAttackersWeight[Us] += KingAttackWeights[Pt]; kingAttackersWeight[Us] += KingAttackWeights[Pt];