rn2k1n1/4p1b1/2p2p1r/p1P1q1p1/p2PP1Pp/R1Q2N1P/1P2K3/1NB2B1R w q - 3 21
FEN state: rn2k1n1/4p1b1/2p2p1r/p1P1q1p1/p2PP1Pp/R1Q2N1P/1P2K3/1NB2B1R w q - 3 21 ; Best move: d4e5
The current state of the chess board is: Black rook at a8, black knight at b8, black king at e8 and black knight at g8. Black pawn at e7 and black bishop at g7. Black pawn at c6, black pawn at f6 and black rook at h6. Black pawn at a5, white pawn at c5, black queen at e5 and black pawn at g5. Black pawn at a4, white pawn at d4, white pawn at e4, white pawn at g4 and black pawn at h4. White rook at a3, white queen at c3, white knight at f3 and white pawn at h3. White pawn at b2 and white king at e2. White knight at b1, white bishop at c1, white bishop at f1 and white rook at h1. Black queenside is the only castle move available. Half move number is 3. Full move number is 21. White to move.