r1bqkbr1/1p2p1p1/p1np4/1Pp2p1p/P2PP1nP/5PP1/2PK4/RNB1QBNR w q - 1 13
FEN state: r1bqkbr1/1p2p1p1/p1np4/1Pp2p1p/P2PP1nP/5PP1/2PK4/RNB1QBNR w q - 1 13 ; Best move: b5c6
The current state of the chess board is: Black rook at a8, black bishop at c8, black queen at d8, black king at e8, black bishop at f8 and black rook at g8. Black pawn at b7, black pawn at e7 and black pawn at g7. Black pawn at a6, black knight at c6 and black pawn at d6. White pawn at b5, black pawn at c5, black pawn at f5 and black pawn at h5. White pawn at a4, white pawn at d4, white pawn at e4, black knight at g4 and white pawn at h4. White pawn at f3 and white pawn at g3. White pawn at c2 and white king at d2. White rook at a1, white knight at b1, white bishop at c1, white queen at e1, white bishop at f1, white knight at g1 and white rook at h1. Black queenside is the only castle move available. Half move number is 1. Full move number is 13. White to move.