1rb1k2r/ppp1b2p/n2pqp1n/NPP1P3/4P1p1/P2N4/3K1PPP/R1B2B1R b - - 0 20
FEN state: 1rb1k2r/ppp1b2p/n2pqp1n/NPP1P3/4P1p1/P2N4/3K1PPP/R1B2B1R b - - 0 20 ; Best move: a6c5
The current state of the chess board is: Black rook at b8, black bishop at c8, black king at e8 and black rook at h8. Black pawn at a7, black pawn at b7, black pawn at c7, black bishop at e7 and black pawn at h7. Black knight at a6, black pawn at d6, black queen at e6, black pawn at f6 and black knight at h6. White knight at a5, white pawn at b5, white pawn at c5 and white pawn at e5. White pawn at e4 and black pawn at g4. White pawn at a3 and white knight at d3. White king at d2, white pawn at f2, white pawn at g2 and white pawn at h2. White rook at a1, white bishop at c1, white bishop at f1 and white rook at h1. Both players have exhausted their castles. Half move number is 0. Full move number is 20. Black to move.