public bool TryProbe(ulong key, out TranspositionTableEntry entry, out ulong entryKey)
{
//entry = default; return false;
var index = GetTableIndex(key);
entry = _entries[index];
var exists = entry.Flag != TranspositionTableFlags.None;
//entryKey = entry.Key;
entryKey = RestoreKey(entry.PartialKey, index);
//var exists = entry.Key != 0;
return(exists);
}
public void Store(UInt64 key, Move move, int depth, int score, Byte flag)
{
var index = GetTableIndex(key);
var existingEntry = _entries[index];
//var entryKey = existingEntry.Key;
var entryKey = RestoreKey(existingEntry.PartialKey, index);
// Cpw
if (entryKey == key && existingEntry.Depth > depth)
{
return;
}
if (existingEntry.Flag == TranspositionTableFlags.Exact)
{
if (flag != TranspositionTableFlags.Exact)
{
return;
}
}
//if (existingEntry.Depth > depth && existingEntry.Key == key)
//{
// return;
//}
// Stockfish
/*if (flag != TranspositionTableFlags.Exact && existingEntry.Key == key && depth <= existingEntry.Depth - 4)
* {
* return;
* }*/
var entry = new TranspositionTableEntry(key, move, (byte)depth, (short)score, flag /*, key2*/);
_entries[index] = entry;
}