Fix check escape rule

fdomig · fdomig · commit 82f6a06220a9 · 2016-03-20T13:24:24.000+01:00
diff --git a/engine/fen.go b/engine/fen.go
@@ -12,6 +12,7 @@ const (
 	// 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
+	// defaultFEN = "rnbqkbnr/3p1ppp/p3p3/1pp3B1/3PP3/2N2N2/PPP2PPP/R2QKB1R b KQkq - 1 5" // thinks it's check but isn't
 )
 
 func generateFEN(board *Board) string {
diff --git a/engine/game.go b/engine/game.go
@@ -63,6 +63,7 @@ func (g *Game) Run() {
 
 		} else if in == "do" || in == "d" {
 			g.board.MakeMove(Search(g.board))
+			fmt.Printf("%s\n", g.board.String())
 
 		} else if in == "eval" || in == "e" {
 			fmt.Printf("Score: %d\n", Evaluate(g.board))
diff --git a/engine/generator.go b/engine/generator.go
@@ -465,10 +465,11 @@ func (g *Generator) findThreats(square Square, sideToMove int8, skipKing bool) [
 	for _, delta := range deltaAll {
 		depth := 0
 		for to := int8(square) + delta; g.board.legalSquare(to); to += delta {
+			depth++
 			content := g.board.data[to] * sideToMove
 
 			// if there is a pawn/king on next square, check for attack
-			if content == Pawn || content == King {
+			if content == -Pawn || content == -King {
 				if depth == 1 {
 					if g.attackPosible(to, opposite(delta)) {
 						threats = append(threats, to)

Original file line number	Diff line number	Diff line change
`@@ -12,6 +12,7 @@ const (`
`12`	`12`	`// defaultFEN = "r3k2r/p1ppqpb1/bn2pnp1/3PN3/1p2P3/2N2Q1p/PPPBBPPP/R3K2R w KQkq -"`
`13`	`13`	`// defaultFEN = "k7/8/K7/8/7p/7P/8/8 w - - 0 1" // only kings`
`14`	`14`	`// defaultFEN = "r1bqkb1r/ppp1pppp/1nnp4/4P3/2P5/2N2N2/PP1PQPPP/R1B1KB1R b KQkq - 1 6" // leads to a thrid rook for black`
	`15`	`+ // defaultFEN = "rnbqkbnr/3p1ppp/p3p3/1pp3B1/3PP3/2N2N2/PPP2PPP/R2QKB1R b KQkq - 1 5" // thinks it's check but isn't`
`15`	`16`	`)`
`16`	`17`
`17`	`18`	`func generateFEN(board *Board) string {`