1n1qkb1r/1r2n3/7p/pppppP2/P1PP2PR/NPB5/1Q3P2/RB2K1N1 b k - 0 21
FEN state: 1n1qkb1r/1r2n3/7p/pppppP2/P1PP2PR/NPB5/1Q3P2/RB2K1N1 b k - 0 21 ; Best move: c5d4
The current state of the chess board is: Black knight at b8, black queen at d8, black king at e8, black bishop at f8 and black rook at h8. Black rook at b7 and black knight at e7. Black pawn at h6. Black pawn at a5, black pawn at b5, black pawn at c5, black pawn at d5, black pawn at e5 and white pawn at f5. White pawn at a4, white pawn at c4, white pawn at d4, white pawn at g4 and white rook at h4. White knight at a3, white pawn at b3 and white bishop at c3. White queen at b2 and white pawn at f2. White rook at a1, white bishop at b1, white king at e1 and white knight at g1. Black kingside is the only castle move available. Half move number is 0. Full move number is 21. Black to move.