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Add bonus for advanced lever

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Passed both STC
LLR: 2.95 (-2.94,2.94) [-1.50,4.50]
Total: 15413 W: 2670 L: 2530 D: 10213

And LTC:
LLR: 2.95 (-2.94,2.94) [1.00,6.00]
Total: 66908 W: 9398 L: 8960 D: 48550

Bench : 7859385
This commit is contained in:
Reuven Peleg 2014-06-11 23:36:46 +09:00 • committed by Marco Costalba
parent b6cd89aeaf
commit 2312c26722
1 changed files with 11 additions and 1 deletions
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12
src/pawns.cpp
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@ -57,6 +57,11 @@ namespace {
S( 0, 0), S( 6, 13), S(6,13), S(14,29),
S(34,68), S(83,166), S(0, 0), S( 0, 0) };
// Levers bonus by rank
const Score Lever[RANK_NB] = {
S( 0, 0), S( 0, 0), S(0, 0), S(0, 0),
S(20,20), S(40,40), S(0, 0), S(0, 0) };
// Bonus for file distance of the two outermost pawns
const Score PawnsFileSpan = S(0, 15);
@ -88,11 +93,12 @@ namespace {
const Square Up = (Us == WHITE ? DELTA_N : DELTA_S);
const Square Right = (Us == WHITE ? DELTA_NE : DELTA_SW);
const Square Left = (Us == WHITE ? DELTA_NW : DELTA_SE);
const Piece pc = make_piece(Us, PAWN);
Bitboard b, p, doubled;
Square s;
File f;
bool passed, isolated, opposed, connected, backward, candidate, unsupported;
bool passed, isolated, opposed, connected, backward, candidate, unsupported, lever;
Score value = SCORE_ZERO;
const Square* pl = pos.list<PAWN>(Us);
@ -130,6 +136,7 @@ namespace {
doubled = ourPawns & forward_bb(Us, s);
opposed = theirPawns & forward_bb(Us, s);
passed = !(theirPawns & passed_pawn_mask(Us, s));
lever = theirPawns & StepAttacksBB[pc][s];
// Test for backward pawn.
// If the pawn is passed, isolated, or connected it cannot be
@ -192,6 +199,9 @@ namespace {
if (!doubled)
e->candidatePawns[Us] |= s;
}
if (lever)
value += Lever[relative_rank(Us, s)];
}
// In endgame it's better to have pawns on both wings. So give a bonus according