One root move paired with the position it reaches: the unit of work a root-split
search hands out. The split itself is synchronous and cheap (legal moves plus one
apply each); the expensive part is scoring each child, which is what leaves the
caller's thread.
One root move paired with the position it reaches: the unit of work a root-split search hands out. The split itself is synchronous and cheap (legal moves plus one apply each); the expensive part is scoring each child, which is what leaves the caller's thread.