r1bqkb2/p1p3rp/2np1pp1/1p2n3/1P2p2P/4PPPR/PBPP4/RN1QKBN1 w q - 2 15
FEN state: r1bqkb2/p1p3rp/2np1pp1/1p2n3/1P2p2P/4PPPR/PBPP4/RN1QKBN1 w q - 2 15 ; Best move: f1b5
The current state of the chess board is: Black rook at a8, black bishop at c8, black queen at d8, black king at e8 and black bishop at f8. Black pawn at a7, black pawn at c7, black rook at g7 and black pawn at h7. Black knight at c6, black pawn at d6, black pawn at f6 and black pawn at g6. Black pawn at b5 and black knight at e5. White pawn at b4, black pawn at e4 and white pawn at h4. White pawn at e3, white pawn at f3, white pawn at g3 and white rook at h3. White pawn at a2, white bishop at b2, white pawn at c2 and white pawn at d2. White rook at a1, white knight at b1, white queen at d1, white king at e1, white bishop at f1 and white knight at g1. Black queenside is the only castle move available. Half move number is 2. Full move number is 15. White to move.