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Pawn flank attacks

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This patch tweaks some pawn values to favor flank attacks.

The first part of the patch increases the midgame psqt values of external pawns to launch more attacks (credits to user GuardianRM for this idea), while the second part increases the endgame connection values for pawns on upper ranks.

Passed STC:
LLR: 2.95 (-2.94,2.94) [0.00,4.00]
Total: 34997 W: 6328 L: 6055 D: 22614

and LTC:
LLR: 2.96 (-2.94,2.94) [0.00,4.00]
Total: 13844 W: 1832 L: 1650 D: 10362

Bench: 5884767
This commit is contained in:
Stéphane Nicolet
2016-12-05 18:49:07 +01:00
committed by Marco Costalba
parent 46d066b041
commit 0d33466bcd
2 changed files with 7 additions and 7 deletions
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2
src/pawns.cpp
View File

@@ -197,7 +197,7 @@ void init() {
{
int v = (Seed[r] + (phalanx ? (Seed[r + 1] - Seed[r]) / 2 : 0)) >> opposed;
v += (apex ? v / 2 : 0);
Connected[opposed][phalanx][apex][r] = make_score(v, v * 5 / 8);
Connected[opposed][phalanx][apex][r] = make_score(v, v * (r-2) / 4);
}
}

12
src/psqt.cpp
View File

@@ -39,12 +39,12 @@ const Score Bonus[][RANK_NB][int(FILE_NB) / 2] = {
{ },
{ // Pawn
{ S( 0, 0), S( 0, 0), S( 0, 0), S( 0, 0) },
{ S(-16, 7), S( 1,-4), S( 7, 8), S( 3,-2) },
{ S(-23,-4), S( -7,-5), S( 19, 5), S(24, 4) },
{ S(-22, 3), S(-14, 3), S( 20,-8), S(35,-3) },
{ S(-11, 8), S( 0, 9), S( 3, 7), S(21,-6) },
{ S(-11, 8), S(-13,-5), S( -6, 2), S(-2, 4) },
{ S( -9, 3), S( 15,-9), S( -8, 1), S(-4,18) }
{ S(-11, 7), S( 6,-4), S( 7, 8), S( 3,-2) },
{ S(-18,-4), S( -2,-5), S( 19, 5), S(24, 4) },
{ S(-17, 3), S( -9, 3), S( 20,-8), S(35,-3) },
{ S(- 6, 8), S( 5, 9), S( 3, 7), S(21,-6) },
{ S(- 6, 8), S(- 8,-5), S( -6, 2), S(-2, 4) },
{ S( -4, 3), S( 20,-9), S( -8, 1), S(-4,18) }
},
{ // Knight
{ S(-143, -97), S(-96,-82), S(-80,-46), S(-73,-14) },