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No DC prune in QS (official-stockfish#2185)

Don't prune discover checks in qSearch

STC:
LLR: 2.96 (-2.94,2.94) [0.50,4.50]
Total: 23176 W: 5320 L: 5039 D: 12817
http://tests.stockfishchess.org/tests/view/5cfbc9350ebc5925cf094ab3

LTC:
LLR: 2.95 (-2.94,2.94) [0.00,3.50]
Total: 128428 W: 22222 L: 21679 D: 84527
http://tests.stockfishchess.org/tests/view/5cfbf0b70ebc5925cf094ebc

Bench: 3883245
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VoyagerOne authored and mcostalba committed Jun 9, 2019
1 parent d39bc2e commit a9cca5c953e6ccec865102b13b47b9f45d98a0fc
Showing with 1 addition and 0 deletions.
  1. +1 −0 src/search.cpp
@@ -1363,6 +1363,7 @@ namespace {

// Don't search moves with negative SEE values
if ( (!inCheck || evasionPrunable)
&& (!givesCheck || !(pos.blockers_for_king(~pos.side_to_move()) & from_sq(move)))
&& !pos.see_ge(move))
continue;

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