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Retire PawnsFileSpan

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It is useless. Tested as no regression:

STC
LLR: 4.06 (-2.94,2.94) [-3.00,1.00]
Total: 140718 W: 28527 L: 28568 D: 83623

LTC
LLR: 2.94 (-2.94,2.94) [-3.00,1.00]
Total: 60034 W: 10359 L: 10303 D: 39372

bench: 6564212

Resolves #88
This commit is contained in:
Marco Costalba 2014-11-01 18:15:07 +01:00 • committed by Joona Kiiski
parent d9caede324
commit d3091971b7
1 changed files with 0 additions and 7 deletions
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7
src/pawns.cpp
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@ -57,9 +57,6 @@ namespace {
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, 8);
// Unsupported pawn penalty
const Score UnsupportedPawnPenalty = S(20, 10);
@ -183,10 +180,6 @@ namespace {
b = e->semiopenFiles[Us] ^ 0xFF;
e->pawnSpan[Us] = b ? int(msb(b) - lsb(b)) : 0;
// In endgame it's better to have pawns on both wings. So give a bonus according
// to file distance between left and right outermost pawns.
value += PawnsFileSpan * e->pawnSpan[Us];
return value;
}