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Simplify verification search (#1362)

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1. avoid recursive call of verification.
   For the interested side to move recursion makes no sense.
   For the other side it could make sense in case of mutual zugzwang,
   but I was not able to figure out any concrete problematic position.
   Allows the removal of 2 local variables.
   
2. avoid further reduction by removing R += ONE_PLY;

Benchmark with zugzwang-suite (see #1338), max 45 secs per position:
Patch  solves 33 out of 37
Master solves 31 out of 37

STC:
LLR: 2.95 (-2.94,2.94) [-3.00,1.00]
Total: 76188 W: 13866 L: 13840 D: 48482
http://tests.stockfishchess.org/tests/view/5a5612ed0ebc590297da516c

LTC:
LLR: 2.95 (-2.94,2.94) [-3.00,1.00]
Total: 40479 W: 5247 L: 5152 D: 30080
http://tests.stockfishchess.org/tests/view/5a56f7d30ebc590299e4550e

bench: 5340015
This commit is contained in:
Günther Demetz
2018-01-13 09:01:23 +01:00
committed by Marco Costalba
parent aa88261a8f
commit 1b6459195c
3 changed files with 7 additions and 12 deletions
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4
src/thread.cpp
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@@ -187,12 +187,10 @@ void ThreadPool::start_thinking(Position& pos, StateListPtr& states,
for (Thread* th : *this)
{
th->nodes = th->tbHits = 0;
th->nodes = th->tbHits = th->nmp_ply = th->nmp_odd = 0;
th->rootDepth = th->completedDepth = DEPTH_ZERO;
th->rootMoves = rootMoves;
th->rootPos.set(pos.fen(), pos.is_chess960(), &setupStates->back(), th);
th->nmp_ply = 0;
th->pair = -1;
}
setupStates->back() = tmp;