r2qk1nr/pbppp3/np5p/1P2b1p1/3NPpPP/P1P2P2/3PK3/RNBQ1B1R b kq - 0 13
FEN state: r2qk1nr/pbppp3/np5p/1P2b1p1/3NPpPP/P1P2P2/3PK3/RNBQ1B1R b kq - 0 13 ; Best move: a6c5
The current state of the chess board is: Black rook at a8, black queen at d8, black king at e8, black knight at g8 and black rook at h8. Black pawn at a7, black bishop at b7, black pawn at c7, black pawn at d7 and black pawn at e7. Black knight at a6, black pawn at b6 and black pawn at h6. White pawn at b5, black bishop at e5 and black pawn at g5. White knight at d4, white pawn at e4, black pawn at f4, white pawn at g4 and white pawn at h4. White pawn at a3, white pawn at c3 and white pawn at f3. White pawn at d2 and white king at e2. White rook at a1, white knight at b1, white bishop at c1, white queen at d1, white bishop at f1 and white rook at h1. Black kingside and black queenside castles are available. Half move number is 0. Full move number is 13. Black to move.