bugfix: king position not updating properly after long castle

- This causes valid move generation to fail and allow illegal king moves like capturing a defended piece or moving next to the enemy king
dechristopher · Mar 3, 2021 · 45d3763 · 45d3763
1 parent 4de4072
commit 45d3763
Showing 1 changed file with 6 additions and 0 deletions.
diff --git a/board.go b/board.go
@@ -295,8 +295,14 @@ func (b *Board) calcConvenienceBBs(m *Move) {
  }
  } else if m.s1 == b.whiteKingSq {
  b.whiteKingSq = m.s2
+ if m.HasTag(FarPawnCastle) {
+ b.whiteKingSq = C1
+ }
  } else if m.s1 == b.blackKingSq {
  b.blackKingSq = m.s2
+ if m.HasTag(FarPawnCastle) {
+ b.blackKingSq = B4
+ }
  }
 }