1r1qk1nr/1b2pp1p/3p2p1/1P6/pP2Pb1P/n1P3P1/PBN2PB1/R4KNR b k - 2 21
FEN state: 1r1qk1nr/1b2pp1p/3p2p1/1P6/pP2Pb1P/n1P3P1/PBN2PB1/R4KNR b k - 2 21 ; Best move: a3c2
The current state of the chess board is: Black rook at b8, black queen at d8, black king at e8, black knight at g8 and black rook at h8. Black bishop at b7, black pawn at e7, black pawn at f7 and black pawn at h7. Black pawn at d6 and black pawn at g6. White pawn at b5. Black pawn at a4, white pawn at b4, white pawn at e4, black bishop at f4 and white pawn at h4. Black knight at a3, white pawn at c3 and white pawn at g3. White pawn at a2, white bishop at b2, white knight at c2, white pawn at f2 and white bishop at g2. White rook at a1, white king at f1, white knight at g1 and white rook at h1. Black kingside is the only castle move available. Half move number is 2. Full move number is 21. Black to move.