do IID for all sufficiently deep searches without TT move.
passed STC:
LLR: 2.96 (-2.94,2.94) [-3.00,1.00]
Total: 25494 W: 5313 L: 5199 D: 14982
http://tests.stockfishchess.org/tests/view/
5ae1e8dd0ebc596317520583
passed LTC:
LLR: 2.95 (-2.94,2.94) [-3.00,1.00]
Total: 80582 W: 12162 L: 12130 D: 56290
http://tests.stockfishchess.org/tests/view/
5ae1f5ab0ebc5963175205a4
Bench:
4966970
}
// Step 11. Internal iterative deepening (skipped when in check, ~2 Elo)
- if ( depth >= 6 * ONE_PLY
- && !ttMove
- && (PvNode || ss->staticEval + 128 >= beta))
+ if ( depth >= 8 * ONE_PLY
+ && !ttMove)
{
Depth d = 3 * depth / 4 - 2 * ONE_PLY;
search<NT>(pos, ss, alpha, beta, d, cutNode, true);