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Reintroduce king infiltration

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This patch reintroduces the recently simplified king infiltration bonus
in initiative calculation, doubling its effect, and compensating more.

passed STC
http://tests.stockfishchess.org/tests/view/5e3476f630ae32da08941d5c
LLR: 2.94 (-2.94,2.94) {-0.50,1.50}
Total: 75323 W: 14434 L: 14140 D: 46749
Ptnml(0-2): 1231, 8729, 17528, 8826, 1331

passed LTC
http://tests.stockfishchess.org/tests/view/5e377353e70d848499f638c1
LLR: 2.94 (-2.94,2.94) {0.25,1.75}
Total: 171466 W: 22223 L: 21561 D: 127682
Ptnml(0-2): 1204, 15951, 50831, 16397, 1312

closes https://github.com/official-stockfish/Stockfish/pull/2545

Brench: 4869669
This commit is contained in:
Vizvezdenec
2020-02-04 20:41:58 +03:00
committed by Joost VandeVondele
parent 0f37da0e34
commit ddd4224640
1 changed files with 5 additions and 1 deletions
Download Patch File Download Diff File Expand all files Collapse all files

6
src/evaluate.cpp
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@@ -708,14 +708,18 @@ namespace {
&& outflanking < 0 && outflanking < 0
&& !pawnsOnBothFlanks; && !pawnsOnBothFlanks;
bool infiltration = rank_of(pos.square<KING>(WHITE)) > RANK_4
|| rank_of(pos.square<KING>(BLACK)) < RANK_5;
// Compute the initiative bonus for the attacking side // Compute the initiative bonus for the attacking side
int complexity = 9 * pe->passed_count() int complexity = 9 * pe->passed_count()
+ 11 * pos.count<PAWN>() + 11 * pos.count<PAWN>()
+ 9 * outflanking + 9 * outflanking
+ 21 * pawnsOnBothFlanks + 21 * pawnsOnBothFlanks
+ 24 * infiltration
+ 51 * !pos.non_pawn_material() + 51 * !pos.non_pawn_material()
- 43 * almostUnwinnable - 43 * almostUnwinnable
- 95 ; -110 ;
// Give more importance to non-material score // Give more importance to non-material score
Value mg = mg_value(score); Value mg = mg_value(score);