r1bq1br1/pp1nk1p1/5pPn/3ppP1p/PPP1N3/3NK3/1R1PP2P/2BQ1BR1 b - - 1 21
FEN state: r1bq1br1/pp1nk1p1/5pPn/3ppP1p/PPP1N3/3NK3/1R1PP2P/2BQ1BR1 b - - 1 21 ; Best move: d5e4
The current state of the chess board is: Black rook at a8, black bishop at c8, black queen at d8, black bishop at f8 and black rook at g8. Black pawn at a7, black pawn at b7, black knight at d7, black king at e7 and black pawn at g7. Black pawn at f6, white pawn at g6 and black knight at h6. Black pawn at d5, black pawn at e5, white pawn at f5 and black pawn at h5. White pawn at a4, white pawn at b4, white pawn at c4 and white knight at e4. White knight at d3 and white king at e3. White rook at b2, white pawn at d2, white pawn at e2 and white pawn at h2. White bishop at c1, white queen at d1, white bishop at f1 and white rook at g1. Both players have exhausted their castles. Half move number is 1. Full move number is 21. Black to move.