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Update reverse move stats

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For a good quiet non-pawn move consider the reverse move as bad
and update the main history with a negative stat bonus.

STC:
LLR: 2.95 (-2.94,2.94) [0.50,4.50]
Total: 19292 W: 4401 L: 4141 D: 10750
http://tests.stockfishchess.org/tests/view/5d7751d50ebc594e7864973c

LTC:
LLR: 2.95 (-2.94,2.94) [0.00,3.50]
Total: 111952 W: 18762 L: 18275 D: 74915
http://tests.stockfishchess.org/tests/view/5d7771cf0ebc594e786498fa

Closes https://github.com/official-stockfish/Stockfish/pull/2294

Bench: 3914238
This commit is contained in:
Stefan Geschwentner
2019-09-11 13:46:08 +02:00
committed by Stéphane Nicolet
parent 8fec883471
commit 61f44ce578
2 changed files with 8 additions and 1 deletions
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src/search.cpp
+4 -1
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@@ -1113,7 +1113,7 @@ moves_loop: // When in check, search starts from here
// castling moves, because they are coded as "king captures rook" and
// hence break make_move(). (~5 Elo)
else if ( type_of(move) == NORMAL
&& !pos.see_ge(make_move(to_sq(move), from_sq(move))))
&& !pos.see_ge(reverse_move(move)))
r -= 2 * ONE_PLY;
ss->statScore = thisThread->mainHistory[us][from_to(move)]
@@ -1603,6 +1603,9 @@ moves_loop: // When in check, search starts from here
thisThread->mainHistory[us][from_to(move)] << bonus;
update_continuation_histories(ss, pos.moved_piece(move), to_sq(move), bonus);
if (type_of(pos.moved_piece(move)) != PAWN)
thisThread->mainHistory[us][from_to(reverse_move(move))] << -bonus;
if (is_ok((ss-1)->currentMove))
{
Square prevSq = to_sq((ss-1)->currentMove);