N1bqk2r/1pp1bp2/3rp2p/p1np2p1/PP1Nn2P/4P3/R2PBPPR/2BQK3 b - - 2 21
FEN state: N1bqk2r/1pp1bp2/3rp2p/p1np2p1/PP1Nn2P/4P3/R2PBPPR/2BQK3 b - - 2 21 ; Best move: a5b4
The current state of the chess board is: White knight at a8, black bishop at c8, black queen at d8, black king at e8 and black rook at h8. Black pawn at b7, black pawn at c7, black bishop at e7 and black pawn at f7. Black rook at d6, black pawn at e6 and black pawn at h6. Black pawn at a5, black knight at c5, black pawn at d5 and black pawn at g5. White pawn at a4, white pawn at b4, white knight at d4, black knight at e4 and white pawn at h4. White pawn at e3. White rook at a2, white pawn at d2, white bishop at e2, white pawn at f2, white pawn at g2 and white rook at h2. White bishop at c1, white queen at d1 and white king at e1. Both players have exhausted their castles. Half move number is 2. Full move number is 21. Black to move.