rn2kb1r/pp2pp1B/7n/1q1pN1P1/P1p5/4PP1b/1PPP1KP1/RNBQ3R w q - 1 13
FEN state: rn2kb1r/pp2pp1B/7n/1q1pN1P1/P1p5/4PP1b/1PPP1KP1/RNBQ3R w q - 1 13 ; Best move: a4b5
The current state of the chess board is: Black rook at a8, black knight at b8, black king at e8, black bishop at f8 and black rook at h8. Black pawn at a7, black pawn at b7, black pawn at e7, black pawn at f7 and white bishop at h7. Black knight at h6. Black queen at b5, black pawn at d5, white knight at e5 and white pawn at g5. White pawn at a4 and black pawn at c4. White pawn at e3, white pawn at f3 and black bishop at h3. White pawn at b2, white pawn at c2, white pawn at d2, white king at f2 and white pawn at g2. White rook at a1, white knight at b1, white bishop at c1, white queen at d1 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.