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Lower razor depth to < 3 and adjust margin

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Various margins were tested: 600, 560, 585, 580, 590 and 595.

Only 590 (this patch) passed both STC and LTC.
Higher margins appear to be better for longer time controls.

STC:
LLR: 2.95 (-2.94,2.94) [0.00,4.00]
Total: 24496 W: 5470 L: 5210 D: 13816
http://tests.stockfishchess.org/tests/view/5a8c6d040ebc590297cc8508

LTC:
LLR: 2.95 (-2.94,2.94) [0.00,4.00]
Total: 74540 W: 12888 L: 12491 D: 49161
http://tests.stockfishchess.org/tests/view/5a8d14c70ebc590297cc8566

Bench: 5475941
This commit is contained in:
Tom Vijlbrief 2018-02-15 08:47:30 +01:00 • committed by Stéphane Nicolet
parent a09eee5798
commit 9246e4a6f9
1 changed files with 2 additions and 2 deletions
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4
src/search.cpp
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@ -67,7 +67,7 @@ namespace {
const int SkipPhase[] = { 0, 1, 0, 1, 2, 3, 0, 1, 2, 3, 4, 5, 0, 1, 2, 3, 4, 5, 6, 7 };
// Razoring and futility margins
const int RazorMargin = 600;
const int RazorMargin = 590;
Value futility_margin(Depth d) { return Value(150 * d / ONE_PLY); }
// Futility and reductions lookup tables, initialized at startup
@ -667,7 +667,7 @@ namespace {
// Step 7. Razoring (skipped when in check)
if ( !PvNode
&& depth < 4 * ONE_PLY
&& depth < 3 * ONE_PLY
&& eval + RazorMargin <= alpha)
{
if (depth <= ONE_PLY)