rn1qkbn1/2pppp1r/b7/pp5p/PP1P2pP/1N6/R1P1PPPR/2BQKBN1 b q - 0 10
FEN state: rn1qkbn1/2pppp1r/b7/pp5p/PP1P2pP/1N6/R1P1PPPR/2BQKBN1 b q - 0 10 ; Best move: b5a4
The current state of the chess board is: Black rook at a8, black knight at b8, black queen at d8, black king at e8, black bishop at f8 and black knight at g8. Black pawn at c7, black pawn at d7, black pawn at e7, black pawn at f7 and black rook at h7. Black bishop at a6. Black pawn at a5, black pawn at b5 and black pawn at h5. White pawn at a4, white pawn at b4, white pawn at d4, black pawn at g4 and white pawn at h4. White knight at b3. White rook at a2, white pawn at c2, white pawn at e2, white pawn at f2, white pawn at g2 and white rook at h2. White bishop at c1, white queen at d1, white king at e1, white bishop at f1 and white knight at g1. Black queenside is the only castle move available. Half move number is 0. Full move number is 10. Black to move.