r1bq2r1/ppp1k3/2n1np2/P2pP1p1/2P3Pp/bP1PP2P/4N3/RNB2KR1 b - - 0 21
FEN state: r1bq2r1/ppp1k3/2n1np2/P2pP1p1/2P3Pp/bP1PP2P/4N3/RNB2KR1 b - - 0 21 ; Best move: a3c1
The current state of the chess board is: Black rook at a8, black bishop at c8, black queen at d8 and black rook at g8. Black pawn at a7, black pawn at b7, black pawn at c7 and black king at e7. Black knight at c6, black knight at e6 and black pawn at f6. White pawn at a5, black pawn at d5, white pawn at e5 and black pawn at g5. White pawn at c4, white pawn at g4 and black pawn at h4. Black bishop at a3, white pawn at b3, white pawn at d3, white pawn at e3 and white pawn at h3. White knight at e2. White rook at a1, white knight at b1, white bishop at c1, white king at f1 and white rook at g1. Both players have exhausted their castles. Half move number is 0. Full move number is 21. Black to move.