rn2kb1r/p5p1/bp1p4/Np2p2p/1P1q1PnP/B1PK4/1Q2P1PR/1R3B2 w q - 0 23
FEN state: rn2kb1r/p5p1/bp1p4/Np2p2p/1P1q1PnP/B1PK4/1Q2P1PR/1R3B2 w q - 0 23 ; Best move: c3d4
The current state of the chess board is: Black rook at a8, black knight at b8, black king at e8, black bishop at f8 and black rook at h8. Black pawn at a7 and black pawn at g7. Black bishop at a6, black pawn at b6 and black pawn at d6. White knight at a5, black pawn at b5, black pawn at e5 and black pawn at h5. White pawn at b4, black queen at d4, white pawn at f4, black knight at g4 and white pawn at h4. White bishop at a3, white pawn at c3 and white king at d3. White queen at b2, white pawn at e2, white pawn at g2 and white rook at h2. White rook at b1 and white bishop at f1. Black queenside is the only castle move available. Half move number is 0. Full move number is 23. White to move.