This is a functional simplification that simplifies
connected scoring of pawns.
STC
LLR: 2.95 (-2.94,2.94) [-3.00,1.00]
Total: 37472 W: 8318 L: 8228 D: 20926
http://tests.stockfishchess.org/tests/view/
5cae74ef0ebc5925cf00f8a5
LTC
LLR: 2.96 (-2.94,2.94) [-3.00,1.00]
Total: 43035 W: 7366 L: 7281 D: 28388
http://tests.stockfishchess.org/tests/view/
5caea3b50ebc5925cf00fe1e
Bench:
3470173
constexpr Score Isolated = S( 5, 15);
// Connected pawn bonus
constexpr Score Isolated = S( 5, 15);
// Connected pawn bonus
- constexpr int Connected[RANK_NB] = { 0, 13, 24, 18, 65, 100, 175, 330 };
+ constexpr int Connected[RANK_NB] = { 0, 13, 17, 24, 59, 96, 171 };
// 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.
// 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.
assert(pos.piece_on(s) == make_piece(Us, PAWN));
File f = file_of(s);
assert(pos.piece_on(s) == make_piece(Us, PAWN));
File f = file_of(s);
+ Rank r = relative_rank(Us, s);
e->semiopenFiles[Us] &= ~(1 << f);
e->pawnAttacksSpan[Us] |= pawn_attack_span(Us, s);
e->semiopenFiles[Us] &= ~(1 << f);
e->pawnAttacksSpan[Us] |= pawn_attack_span(Us, s);
&& popcount(phalanx) >= popcount(leverPush))
e->passedPawns[Us] |= s;
&& popcount(phalanx) >= popcount(leverPush))
e->passedPawns[Us] |= s;
- else if ( stoppers == square_bb(s + Up)
- && relative_rank(Us, s) >= RANK_5)
+ else if (stoppers == square_bb(s + Up) && r >= RANK_5)
{
b = shift<Up>(support) & ~theirPawns;
while (b)
{
b = shift<Up>(support) & ~theirPawns;
while (b)
// Score this pawn
if (support | phalanx)
{
// Score this pawn
if (support | phalanx)
{
- int r = relative_rank(Us, s);
- int v = phalanx ? Connected[r] + Connected[r + 1] : 2 * Connected[r];
+ int v = (phalanx ? 3 : 2) * Connected[r];
v = 17 * popcount(support) + (v >> (opposed + 1));
score += make_score(v, v * (r - 2) / 4);
}
v = 17 * popcount(support) + (v >> (opposed + 1));
score += make_score(v, v * (r - 2) / 4);
}