rn2kb2/2pq3r/p4p2/1PBNpbp1/2P1P2P/1Q1P1p2/1P4B1/2R2KNR w q - 0 21
FEN state: rn2kb2/2pq3r/p4p2/1PBNpbp1/2P1P2P/1Q1P1p2/1P4B1/2R2KNR w q - 0 21 ; Best move: d5f6
The current state of the chess board is: Black rook at a8, black knight at b8, black king at e8 and black bishop at f8. Black pawn at c7, black queen at d7 and black rook at h7. Black pawn at a6 and black pawn at f6. White pawn at b5, white bishop at c5, white knight at d5, black pawn at e5, black bishop at f5 and black pawn at g5. White pawn at c4, white pawn at e4 and white pawn at h4. White queen at b3, white pawn at d3 and black pawn at f3. White pawn at b2 and white bishop at g2. White rook at c1, white king at f1, white knight at g1 and white rook at h1. Black queenside is the only castle move available. Half move number is 0. Full move number is 21. White to move.