skip setting threatByLesser[KING]

anematode · PikaCat-OuO · commit 981613deaba9 · 2026-03-01T21:59:24.000+08:00
It doesn't make sense for a king to move to a square threatened by a lesser
piece, since that move would be illegal.

No functional change
diff --git a/src/movepick.cpp b/src/movepick.cpp
@@ -134,7 +134,7 @@ ExtMove* MovePicker::score(MoveList<Type>& ml) {
           pos.attacks_by<ADVISOR>(~us) | pos.attacks_by<BISHOP>(~us) | threatByLesser[ADVISOR];
         threatByLesser[ROOK] =
           pos.attacks_by<KNIGHT>(~us) | pos.attacks_by<CANNON>(~us) | threatByLesser[KNIGHT];
-        threatByLesser[KING] = pos.attacks_by<ROOK>(~us) | threatByLesser[ROOK];
+        threatByLesser[KING] = 0;
     }
 
     ExtMove* it = cur;

Original file line number	Diff line number	Diff line change
`@@ -134,7 +134,7 @@ ExtMove* MovePicker::score(MoveList<Type>& ml) {`
`134`	`134`	`pos.attacks_by<ADVISOR>(~us) \| pos.attacks_by<BISHOP>(~us) \| threatByLesser[ADVISOR];`
`135`	`135`	`threatByLesser[ROOK] =`
`136`	`136`	`pos.attacks_by<KNIGHT>(~us) \| pos.attacks_by<CANNON>(~us) \| threatByLesser[KNIGHT];`
`137`		`- threatByLesser[KING] = pos.attacks_by<ROOK>(~us) \| threatByLesser[ROOK];`
	`137`	`+ threatByLesser[KING] = 0;`
`138`	`138`	`}`
`139`	`139`
`140`	`140`	`ExtMove* it = cur;`