r1b1k1nr/p1pp4/n5p1/1pb1pp1p/2P5/BP3NP1/P2NPPBP/R1Q1KR2 b Qkq - 0 10
FEN state: r1b1k1nr/p1pp4/n5p1/1pb1pp1p/2P5/BP3NP1/P2NPPBP/R1Q1KR2 b Qkq - 0 10 ; Best move: b5b4
The current state of the chess board is: Black rook at a8, black bishop at c8, black king at e8, black knight at g8 and black rook at h8. Black pawn at a7, black pawn at c7 and black pawn at d7. Black knight at a6 and black pawn at g6. Black pawn at b5, black bishop at c5, black pawn at e5, black pawn at f5 and black pawn at h5. White pawn at c4. White bishop at a3, white pawn at b3, white knight at f3 and white pawn at g3. White pawn at a2, white knight at d2, white pawn at e2, white pawn at f2, white bishop at g2 and white pawn at h2. White rook at a1, white queen at c1, white king at e1 and white rook at f1. White queenside, black kingside and black queenside castles are available. Half move number is 0. Full move number is 10. Black to move.