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Bonus for pawn scrifice which create passed pawn

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STC:
LLR: 2.95 (-2.94,2.94) [0.00,5.00]
Total: 16752 W: 3141 L: 2944 D: 10667

LTC:
LLR: 3.34 (-2.94,2.94) [0.00,5.00]
Total: 33928 W: 4544 L: 4300 D: 25084

Bench: 5639223

Closes #1092
This commit is contained in:
Stefan Geschwentner 2017-05-07 20:38:03 -07:00 • committed by Joona Kiiski
parent 25296547d0
commit 69ec09bd4b
2 changed files with 10 additions and 3 deletions
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6
src/evaluate.cpp
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@ -618,7 +618,7 @@ namespace {
{
Square s = pop_lsb(&b);
assert(!(pos.pieces(PAWN) & forward_bb(Us, s)));
assert(!(pos.pieces(Them, PAWN) & forward_bb(Us, s + pawn_push(Us))));
bb = forward_bb(Us, s) & (ei.attackedBy[Them][ALL_PIECES] | pos.pieces(Them));
score -= HinderPassedPawn * popcount(bb);
@ -675,8 +675,8 @@ namespace {
} // rr != 0
// Scale down bonus for candidate passers which need more than one
// pawn push to become passed.
if (!pos.pawn_passed(Us, s + pawn_push(Us)))
// pawn push to become passed or have a pawn in front of them.
if (!pos.pawn_passed(Us, s + pawn_push(Us)) || (pos.pieces(PAWN) & forward_bb(Us, s)))
mbonus /= 2, ebonus /= 2;
score += make_score(mbonus, ebonus) + PassedFile[file_of(s)];

7
src/pawns.cpp
View file

@ -163,6 +163,13 @@ namespace {
&& popcount(phalanx) >= popcount(leverPush))
e->passedPawns[Us] |= s;
else if ( stoppers == SquareBB[s + Up]
&& relative_rank(Us, s) >= RANK_5
&& (b = (shift<Up>(supported) & ~theirPawns)))
while(b)
if(!more_than_one(theirPawns & PawnAttacks[Us][pop_lsb(&b)]))
e->passedPawns[Us] |= s;
// Score this pawn
if (!neighbours)
score -= Isolated[opposed];