1rb1k2r/1pp2p2/2q3p1/p1Npp2p/P2P2PB/Rnb2P2/1PPQP2P/3K1B1R b k - 1 20
FEN state: 1rb1k2r/1pp2p2/2q3p1/p1Npp2p/P2P2PB/Rnb2P2/1PPQP2P/3K1B1R b k - 1 20 ; Best move: b3d2
The current state of the chess board is: Black rook at b8, black bishop at c8, black king at e8 and black rook at h8. Black pawn at b7, black pawn at c7 and black pawn at f7. Black queen at c6 and black pawn at g6. Black pawn at a5, white knight at c5, black pawn at d5, black pawn at e5 and black pawn at h5. White pawn at a4, white pawn at d4, white pawn at g4 and white bishop at h4. White rook at a3, black knight at b3, black bishop at c3 and white pawn at f3. White pawn at b2, white pawn at c2, white queen at d2, white pawn at e2 and white pawn at h2. White king at d1, white bishop at f1 and white rook at h1. Black kingside is the only castle move available. Half move number is 1. Full move number is 20. Black to move.