1nb1kb2/r1pp2pr/4p2p/1NP3PP/p2P2p1/PQ2P3/1PK3BR/RNB5 b - - 0 21
FEN state: 1nb1kb2/r1pp2pr/4p2p/1NP3PP/p2P2p1/PQ2P3/1PK3BR/RNB5 b - - 0 21 ; Best move: a4b3
The current state of the chess board is: Black knight at b8, black bishop at c8, black king at e8 and black bishop at f8. Black rook at a7, black pawn at c7, black pawn at d7, black pawn at g7 and black rook at h7. Black pawn at e6 and black pawn at h6. White knight at b5, white pawn at c5, white pawn at g5 and white pawn at h5. Black pawn at a4, white pawn at d4 and black pawn at g4. White pawn at a3, white queen at b3 and white pawn at e3. White pawn at b2, white king at c2, white bishop at g2 and white rook at h2. White rook at a1, white knight at b1 and white bishop at c1. Both players have exhausted their castles. Half move number is 0. Full move number is 21. Black to move.