rq2kb2/p2bp3/3p1p1r/1N1p3p/3P2n1/2PR2p1/PPK1P3/R1B2BN1 w q - 0 23
FEN state: rq2kb2/p2bp3/3p1p1r/1N1p3p/3P2n1/2PR2p1/PPK1P3/R1B2BN1 w q - 0 23 ; Best move: b5a3
The current state of the chess board is: Black rook at a8, black queen at b8, black king at e8 and black bishop at f8. Black pawn at a7, black bishop at d7 and black pawn at e7. Black pawn at d6, black pawn at f6 and black rook at h6. White knight at b5, black pawn at d5 and black pawn at h5. White pawn at d4 and black knight at g4. White pawn at c3, white rook at d3 and black pawn at g3. White pawn at a2, white pawn at b2, white king at c2 and white pawn at e2. White rook at a1, white bishop at c1, white bishop at f1 and white knight at g1. Black queenside is the only castle move available. Half move number is 0. Full move number is 23. White to move.