Chess engine: Stockfish 20012810

Stockfish - UCI chess engine, compiled by 31m059

Timestamp: 1580203885
Less NMP if the position was previously in PV.

The intention of the patch is to avoid aggressive null move pruning (NMP) in positions that have previously been found to be important (PV nodes).
If we already do not apply NMP for current PV nodes, it makes sense to apply it less often for positions that have previously been PV nodes too.

STC:
LLR: 2.96 (-2.94,2.94) {-1.00,3.00}
Total: 14959 W: 2921 L: 2782 D: 9256 Elo +3.23
Ptnml(0-2): 254, 1679, 3493, 1762, 282

LTC:
LLR: 2.95 (-2.94,2.94) {0.00,2.00}
Total: 6442 W: 899 L: 753 D: 4790 Elo +7.88
Ptnml(0-2): 42, 549, 1885, 659, 61
Bench: 4725546

Rating JCER=3344

Stockfish 20012810 - download