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Update failedHighCnt rule official-stockfish#2063

Treat all threads the same as main thread and increment
failedHighCnt on fail highs. This makes the search try
again at lower depth.

@vondele suggested also changing the reset of failedHighCnt
when there is a fail low. Tests including this passed so the
branch has been updated to include both changes. failedHighCnt
is now handled exactly the same in helper threads and the main
thread. Thanks vondele :-)

STC @ 5+0.05 th 4 :
LLR: 2.94 (-2.94,2.94) [-3.00,1.00]
Total: 7769 W: 1704 L: 1557 D: 4508
http://tests.stockfishchess.org/tests/view/5c9f19520ebc5925cfffd2a1

LTC @ 20+0.2 th 8 :
LLR: 2.94 (-2.94,2.94) [-3.00,1.00]
Total: 37888 W: 5983 L: 5889 D: 26016
http://tests.stockfishchess.org/tests/view/5c9f57d10ebc5925cfffd696

Bench 3824325
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xoto10 authored and mcostalba committed Mar 31, 2019
1 parent 02708a4 commit 3a572ffb4840bfea3c587c9c81a0008515f02a32
Showing with 2 additions and 5 deletions.
  1. +2 −5 src/search.cpp
@@ -404,17 +404,14 @@ void Thread::search() {
beta = (alpha + beta) / 2;
alpha = std::max(bestValue - delta, -VALUE_INFINITE);

failedHighCnt = 0;
if (mainThread)
{
failedHighCnt = 0;
mainThread->stopOnPonderhit = false;
}
}
else if (bestValue >= beta)
{
beta = std::min(bestValue + delta, VALUE_INFINITE);
if (mainThread)
++failedHighCnt;
++failedHighCnt;
}
else
break;

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