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feat(ncs-110): feed NNUE root-move scores into search move ordering (#83)
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Pre-evaluated NNUE scores from NNUEBot.batchEvaluateRoot are now passed
as root hints into AlphaBetaSearch, improving move ordering at ply 0 before
the TT is populated. Hints are threaded immutably through SearchParams to
satisfy the no-var constraint.

Co-Authored-By: Claude Sonnet 4.6 <noreply@anthropic.com>

---------

Co-authored-by: Janis Eccarius <eccariusjanis@gmail.com>
Reviewed-on: #83
This commit was merged in pull request #83.
This commit is contained in:
Janis
2026-06-24 20:09:28 +02:00
parent b4709b4a33
commit e4fee85134
6 changed files with 130 additions and 8 deletions
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modules/official-bots/src/test/scala/de/nowchess/bot/AlphaBetaSearchTest.scala
+18
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@@ -312,6 +312,24 @@ class AlphaBetaSearchTest extends AnyFunSuite with Matchers:
val search = AlphaBetaSearch(qRules, weights = ZeroEval)
search.bestMove(GameContext.initial, maxDepth = 1) should be(Some(rootMove))
test("bestMove with root hints returns a valid move without regression"):
val context = GameContext.initial
val legalMoves = DefaultRules.allLegalMoves(context)
val hints = legalMoves.zipWithIndex.map { case (m, i) => m -> (legalMoves.length - i) }.toMap
val withHints = AlphaBetaSearch(DefaultRules, weights = EvaluationClassic)
.bestMove(context, maxDepth = 2, Set.empty, hints)
withHints should not be None
legalMoves should contain(withHints.get)
test("bestMoveWithTime with root hints returns a valid move without regression"):
val context = GameContext.initial
val legalMoves = DefaultRules.allLegalMoves(context)
val hints = legalMoves.zipWithIndex.map { case (m, i) => m -> (legalMoves.length - i) }.toMap
val withHints = AlphaBetaSearch(DefaultRules, weights = EvaluationClassic)
.bestMoveWithTime(context, 500L, Set.empty, hints)
withHints should not be None
legalMoves should contain(withHints.get)
test("quiescence depth-limit in-check branch is exercised"):
val rootMove = Move(Square(File.E, Rank.R2), Square(File.E, Rank.R3), MoveType.Normal())
val capMove = Move(Square(File.D, Rank.R2), Square(File.D, Rank.R3), MoveType.Normal(true))