rn1k4/p4p1r/bq1p4/1pp1p2p/1PPP2P1/P4PP1/N4R2/R1BQKBN1 w Q - 1 21
FEN state: rn1k4/p4p1r/bq1p4/1pp1p2p/1PPP2P1/P4PP1/N4R2/R1BQKBN1 w Q - 1 21 ; Best move: d4c5
The current state of the chess board is: Black rook at a8, black knight at b8 and black king at d8. Black pawn at a7, black pawn at f7 and black rook at h7. Black bishop at a6, black queen at b6 and black pawn at d6. Black pawn at b5, black pawn at c5, black pawn at e5 and black pawn at h5. White pawn at b4, white pawn at c4, white pawn at d4 and white pawn at g4. White pawn at a3, white pawn at f3 and white pawn at g3. White knight at a2 and white rook at f2. White rook at a1, white bishop at c1, white queen at d1, white king at e1, white bishop at f1 and white knight at g1. White queenside is the only castle move available. Half move number is 1. Full move number is 21. White to move.