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Introduce separate counter-move tables for captures

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Enhance counter-move history table by adding a capture/no-capture dimension,
depending wether the previous move was a quiet move or a capture. This doubles
the size of the table but provides more accurate move ordering.

STC:
LLR: 2.95 (-2.94,2.94) [0.50,4.50]
Total: 79702 W: 17720 L: 17164 D: 44818
http://tests.stockfishchess.org/tests/view/5d97945e0ebc590c21aa724b

LTC:
LLR: 2.96 (-2.94,2.94) [0.00,3.50]
Total: 29147 W: 4907 L: 4651 D: 19589
http://tests.stockfishchess.org/tests/view/5d97ccb90ebc590c21aa7bc0

Closes https://github.com/official-stockfish/Stockfish/pull/2344

Bench: 4131643
This commit is contained in:
VoyagerOne
2019-10-05 10:42:36 -04:00
committed by Stéphane Nicolet
parent ca7d4e9ac7
commit 2e96c513ad
5 changed files with 27 additions and 21 deletions
Download Patch File Download Diff File Expand all files Collapse all files

12
src/movepick.cpp
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@@ -111,11 +111,11 @@ void MovePicker::score() {
+ (*captureHistory)[pos.moved_piece(m)][to_sq(m)][type_of(pos.piece_on(to_sq(m)))];
else if (Type == QUIETS)
m.value = (*mainHistory)[pos.side_to_move()][from_to(m)]
+ (*continuationHistory[0])[pos.moved_piece(m)][to_sq(m)]
+ (*continuationHistory[1])[pos.moved_piece(m)][to_sq(m)]
+ (*continuationHistory[3])[pos.moved_piece(m)][to_sq(m)]
+ (*continuationHistory[5])[pos.moved_piece(m)][to_sq(m)] / 2;
m.value = (*mainHistory)[pos.side_to_move()][from_to(m)]
+ 2 * (*continuationHistory[0])[pos.moved_piece(m)][to_sq(m)]
+ 2 * (*continuationHistory[1])[pos.moved_piece(m)][to_sq(m)]
+ 2 * (*continuationHistory[3])[pos.moved_piece(m)][to_sq(m)]
+ (*continuationHistory[5])[pos.moved_piece(m)][to_sq(m)];
else // Type == EVASIONS
{
@@ -206,7 +206,7 @@ top:
endMoves = generate<QUIETS>(pos, cur);
score<QUIETS>();
partial_insertion_sort(cur, endMoves, -4000 * depth);
partial_insertion_sort(cur, endMoves, -3000 * depth);
}
++stage;