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Move depth calculation in probCut

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The change passed an STC regression:

LLR: 2.95 (-2.94,2.94) [-3.00,1.00]
Total: 59350 W: 10793 L: 10738 D: 37819

I verified that there was no change in performance on my machine, but of course YMMV:

Results for 40 tests for each version:

                Base      Test      Diff
        Mean    2014338   2016121   -1783
        StDev   62655     63441     3860

p-value: 0.678
speedup: 0.001

No functional change.

Closes #1137
This commit is contained in:
Brian Sheppard 2017-06-16 19:27:36 -07:00 • committed by Joona Kiiski
parent ebc563059c
commit f907d5b7d9
1 changed files with 2 additions and 3 deletions
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5
src/search.cpp
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@ -784,9 +784,7 @@ namespace {
&& abs(beta) < VALUE_MATE_IN_MAX_PLY)
{
Value rbeta = std::min(beta + 200, VALUE_INFINITE);
Depth rdepth = depth - 4 * ONE_PLY;
assert(rdepth >= ONE_PLY);
assert(is_ok((ss-1)->currentMove));
MovePicker mp(pos, ttMove, rbeta - ss->staticEval);
@ -797,8 +795,9 @@ namespace {
ss->currentMove = move;
ss->history = &thisThread->counterMoveHistory[pos.moved_piece(move)][to_sq(move)];
assert(depth >= 5 * ONE_PLY);
pos.do_move(move, st);
value = -search<NonPV>(pos, ss+1, -rbeta, -rbeta+1, rdepth, !cutNode, false);
value = -search<NonPV>(pos, ss+1, -rbeta, -rbeta+1, depth - 4 * ONE_PLY, !cutNode, false);
pos.undo_move(move);
if (value >= rbeta)
return value;