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IID margin reduced to 128

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Change the internal iterative deepening margin from +256 to +128.

Passed STC:
LLR: 3.26 (-2.94,2.94) [0.00,5.00]
Total: 22006 W: 4646 L: 4400 D: 12960
http://tests.stockfishchess.org/tests/view/5ab54a240ebc590295d8847d

Passed LTC:
LLR: 2.96 (-2.94,2.94) [0.00,4.00]
Total: 46665 W: 7187 L: 6898 D: 32580
http://tests.stockfishchess.org/tests/view/5ab5ba690ebc590295d884b4

Possible work in this area after this change:

• Reduce even more the margin?
• Try to do IID for smaller depths too?

Bench: 5851102
This commit is contained in:
Chess13234
2018-03-23 20:39:07 +02:00
committed by Stéphane Nicolet
parent d40e7ee209
commit 62937d1007
1 changed files with 1 additions and 1 deletions
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2
src/search.cpp
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@@ -791,7 +791,7 @@ namespace {
// Step 11. Internal iterative deepening (skipped when in check) // Step 11. Internal iterative deepening (skipped when in check)
if ( depth >= 6 * ONE_PLY if ( depth >= 6 * ONE_PLY
&& !ttMove && !ttMove
&& (PvNode || ss->staticEval + 256 >= beta)) && (PvNode || ss->staticEval + 128 >= beta))
{ {
Depth d = 3 * depth / 4 - 2 * ONE_PLY; Depth d = 3 * depth / 4 - 2 * ONE_PLY;
search<NT>(pos, ss, alpha, beta, d, cutNode, true); search<NT>(pos, ss, alpha, beta, d, cutNode, true);