Re-adding the 5th continuation history

FauziAkram · vondele · commit f6b0d53a995d · 2025-04-26T21:58:46.000+02:00
the two simplifications (official-stockfish#5992 and official-stockfish#5978) are strongly correlated. Passed STC: LLR: 2.95 (-2.94,2.94) <0.00,2.00> Total: 98016 W: 25415 L: 25008 D: 47593 Ptnml(0-2): 291, 11509, 25005, 11908, 295 https://tests.stockfishchess.org/tests/view/6802774fcd501869c6698168 Passed LTC: LLR: 2.95 (-2.94,2.94) <0.50,2.50> Total: 588588 W: 150073 L: 148633 D: 289882 Ptnml(0-2): 281, 63615, 165078, 65023, 297 https://tests.stockfishchess.org/tests/view/6804cbdacd501869c66987dc closes official-stockfish#6002 Bench: 1783315
diff --git a/src/search.cpp b/src/search.cpp
@@ -1921,7 +1921,7 @@ void update_all_stats(const Position&      pos,
 // at ply -1, -2, -3, -4, and -6 with current move.
 void update_continuation_histories(Stack* ss, Piece pc, Square to, int bonus) {
     static constexpr std::array<ConthistBonus, 6> conthist_bonuses = {
-      {{1, 1103}, {2, 659}, {3, 323}, {4, 533}, {6, 474}}};
+      {{1, 1103}, {2, 659}, {3, 323}, {4, 533}, {5, 121}, {6, 474}}};
 
     for (const auto [i, weight] : conthist_bonuses)
     {

Original file line number	Diff line number	Diff line change
`@@ -1921,7 +1921,7 @@ void update_all_stats(const Position& pos,`
`1921`	`1921`	`// at ply -1, -2, -3, -4, and -6 with current move.`
`1922`	`1922`	`void update_continuation_histories(Stack* ss, Piece pc, Square to, int bonus) {`
`1923`	`1923`	`static constexpr std::array<ConthistBonus, 6> conthist_bonuses = {`
`1924`		`- {{1, 1103}, {2, 659}, {3, 323}, {4, 533}, {6, 474}}};`
	`1924`	`+ {{1, 1103}, {2, 659}, {3, 323}, {4, 533}, {5, 121}, {6, 474}}};`
`1925`	`1925`
`1926`	`1926`	`for (const auto [i, weight] : conthist_bonuses)`
`1927`	`1927`	`{`