rq2kb1r/p2n1p1N/1p2p1p1/1bPp1n2/P1BP3P/2P3PR/1B3P1N/2RQK3 w k - 5 21
FEN state: rq2kb1r/p2n1p1N/1p2p1p1/1bPp1n2/P1BP3P/2P3PR/1B3P1N/2RQK3 w k - 5 21 ; Best move: c4b5
The current state of the chess board is: Black rook at a8, black queen at b8, black king at e8, black bishop at f8 and black rook at h8. Black pawn at a7, black knight at d7, black pawn at f7 and white knight at h7. Black pawn at b6, black pawn at e6 and black pawn at g6. Black bishop at b5, white pawn at c5, black pawn at d5 and black knight at f5. White pawn at a4, white bishop at c4, white pawn at d4 and white pawn at h4. White pawn at c3, white pawn at g3 and white rook at h3. White bishop at b2, white pawn at f2 and white knight at h2. White rook at c1, white queen at d1 and white king at e1. Black kingside is the only castle move available. Half move number is 5. Full move number is 21. White to move.