1rb1kbr1/pp2pp1p/3p4/2P3p1/q3Pn2/2P4P/PP1Q1PPR/RNB1KBN1 b Q - 7 12
FEN state: 1rb1kbr1/pp2pp1p/3p4/2P3p1/q3Pn2/2P4P/PP1Q1PPR/RNB1KBN1 b Q - 7 12 ; Best move: a4e4
The current state of the chess board is: Black rook at b8, black bishop at c8, black king at e8, black bishop at f8 and black rook at g8. Black pawn at a7, black pawn at b7, black pawn at e7, black pawn at f7 and black pawn at h7. Black pawn at d6. White pawn at c5 and black pawn at g5. Black queen at a4, white pawn at e4 and black knight at f4. White pawn at c3 and white pawn at h3. White pawn at a2, white pawn at b2, white queen at d2, white pawn at f2, white pawn at g2 and white rook at h2. White rook at a1, white knight at b1, white bishop at c1, white king at e1, white bishop at f1 and white knight at g1. White queenside is the only castle move available. Half move number is 7. Full move number is 12. Black to move.