Fix casteling bug

fdomig · fdomig · commit 56060cc5d8d6 · 2016-03-19T23:41:14.000+01:00
diff --git a/engine/board.go b/engine/board.go
@@ -59,8 +59,11 @@ func (b *Board) legalSquare(square int8) bool {
 func (b *Board) MakeMove(m Move) {
 
 	historyItem := HistoryItem{
-		move: m, whiteCastle: b.whiteCastle,
-		blackCastle: b.blackCastle, enPassant: b.enPassant, halfMoveClock: b.halfMoveClock,
+		move:          m,
+		whiteCastle:   b.whiteCastle,
+		blackCastle:   b.blackCastle,
+		enPassant:     b.enPassant,
+		halfMoveClock: b.halfMoveClock,
 	}
 
 	b.halfMoveClock++
@@ -139,7 +142,7 @@ func (b *Board) MakeMove(m Move) {
 		b.data[m.From] = Empty
 		// rook
 		rookPos := int8(m.From) - castleLongDistanceRook*nextFile
-		b.data[int8(m.From)+nextFile] = b.data[rookPos]
+		b.data[int8(m.From)-nextFile] = b.data[rookPos]
 		b.data[rookPos] = Empty
 		if m.MovedPiece == WhiteKing {
 			b.whiteCastle = castleNone
diff --git a/engine/fen.go b/engine/fen.go
@@ -9,9 +9,9 @@ import (
 
 const (
 	defaultFEN = "rnbqkbnr/pppppppp/8/8/8/8/PPPPPPPP/RNBQKBNR w KQkq - 0 1"
-
-//defaultFEN = "r3k2r/p1ppqpb1/bn2pnp1/3PN3/1p2P3/2N2Q1p/PPPBBPPP/R3K2R w KQkq -"
-// defaultFEN = "k7/8/K7/8/7p/7P/8/8 w - - 0 1" // only kings
+	// defaultFEN = "r3k2r/p1ppqpb1/bn2pnp1/3PN3/1p2P3/2N2Q1p/PPPBBPPP/R3K2R w KQkq -"
+	// defaultFEN = "k7/8/K7/8/7p/7P/8/8 w - - 0 1" // only kings
+	// defaultFEN = "r1bqkb1r/ppp1pppp/1nnp4/4P3/2P5/2N2N2/PP1PQPPP/R1B1KB1R b KQkq - 1 6" // leads to a thrid rook for black
 )
 
 func generateFEN(board *Board) string {
