rnb4r/p2knp2/2pP2p1/4p3/pR1N3P/N1q4P/3PPPB1/2BQ1K1R b - - 3 21
FEN state: rnb4r/p2knp2/2pP2p1/4p3/pR1N3P/N1q4P/3PPPB1/2BQ1K1R b - - 3 21 ; Best move: c3b4
The current state of the chess board is: Black rook at a8, black knight at b8, black bishop at c8 and black rook at h8. Black pawn at a7, black king at d7, black knight at e7 and black pawn at f7. Black pawn at c6, white pawn at d6 and black pawn at g6. Black pawn at e5. Black pawn at a4, white rook at b4, white knight at d4 and white pawn at h4. White knight at a3, black queen at c3 and white pawn at h3. White pawn at d2, white pawn at e2, white pawn at f2 and white bishop at g2. White bishop at c1, white queen at d1, white king at f1 and white rook at h1. Both players have exhausted their castles. Half move number is 3. Full move number is 21. Black to move.