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Author: Vizvezdenec
Date: Tue Nov 19 23:18:14 2019 +0100
Timestamp: 1574201894

Simplify advanced pawn push pruning

This patch simplifies away all conditions related to advanced pawn pushes
in shallow depth pruning. Idea is based on fact that in master we have
advanced pawn pushes not being pruned what we are only in PV node and
when non-pawn material of opponent is > Bishop, so pretty rarely. With
this patch we will have all pruning heuristics working for this moves as
for every other move.

STC
LLR: 2.94 (-2.94,2.94) [-3.00,1.00]
Total: 159143 W: 34271 L: 34418 D: 90454 Elo -0.32
http://tests.stockfishchess.org/tests/view/5dcdb3110ebc5902563249d7

LTC
LLR: 2.95 (-2.94,2.94) [-3.00,1.00]
Total: 63900 W: 10375 L: 10322 D: 43203 Elo +0.29
http://tests.stockfishchess.org/tests/view/5dd05e820ebc5902579e1fb8

Closes https://github.com/official-stockfish/Stockfish/pull/2416

bench 4897149