r1b1kbn1/qp1pp2r/n1p5/pN3p1p/3PPP2/P3B1p1/1PP1K1PP/R1Q2BNR w q - 1 12
FEN state: r1b1kbn1/qp1pp2r/n1p5/pN3p1p/3PPP2/P3B1p1/1PP1K1PP/R1Q2BNR w q - 1 12 ; Best move: b5a7
The current state of the chess board is: Black rook at a8, black bishop at c8, black king at e8, black bishop at f8 and black knight at g8. Black queen at a7, black pawn at b7, black pawn at d7, black pawn at e7 and black rook at h7. Black knight at a6 and black pawn at c6. Black pawn at a5, white knight at b5, black pawn at f5 and black pawn at h5. White pawn at d4, white pawn at e4 and white pawn at f4. White pawn at a3, white bishop at e3 and black pawn at g3. White pawn at b2, white pawn at c2, white king at e2, white pawn at g2 and white pawn at h2. White rook at a1, white queen at c1, 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 12. White to move.