rnb1kb2/1p1p2p1/4p3/pN3pP1/P1pPn3/4P1P1/2Q1N3/4KB1R b q - 1 21
FEN state: rnb1kb2/1p1p2p1/4p3/pN3pP1/P1pPn3/4P1P1/2Q1N3/4KB1R b q - 1 21 ; Best move: b8a6
The current state of the chess board is: Black rook at a8, black knight at b8, black bishop at c8, black king at e8 and black bishop at f8. Black pawn at b7, black pawn at d7 and black pawn at g7. Black pawn at e6. Black pawn at a5, white knight at b5, black pawn at f5 and white pawn at g5. White pawn at a4, black pawn at c4, white pawn at d4 and black knight at e4. White pawn at e3 and white pawn at g3. White queen at c2 and white knight at e2. White king at e1, white bishop at f1 and white rook at h1. Black queenside is the only castle move available. Half move number is 1. Full move number is 21. Black to move.