r1bk3r/1p4pp/3p3n/pn3Pb1/PPP5/6BN/4PP1P/R2QKBR1 b Q - 2 21
FEN state: r1bk3r/1p4pp/3p3n/pn3Pb1/PPP5/6BN/4PP1P/R2QKBR1 b Q - 2 21 ; Best move: g5f6
The current state of the chess board is: Black rook at a8, black bishop at c8, black king at d8 and black rook at h8. Black pawn at b7, black pawn at g7 and black pawn at h7. Black pawn at d6 and black knight at h6. Black pawn at a5, black knight at b5, white pawn at f5 and black bishop at g5. White pawn at a4, white pawn at b4 and white pawn at c4. White bishop at g3 and white knight at h3. White pawn at e2, white pawn at f2 and white pawn at h2. White rook at a1, white queen at d1, white king at e1, white bishop at f1 and white rook at g1. White queenside is the only castle move available. Half move number is 2. Full move number is 21. Black to move.