1rnq1n1r/2p3kp/pp1Nbp2/QP1P4/P2P1pPp/2N2P1R/4P3/R3KB2 w Q - 0 23
FEN state: 1rnq1n1r/2p3kp/pp1Nbp2/QP1P4/P2P1pPp/2N2P1R/4P3/R3KB2 w Q - 0 23 ; Best move: a5b4
The current state of the chess board is: Black rook at b8, black knight at c8, black queen at d8, black knight at f8 and black rook at h8. Black pawn at c7, black king at g7 and black pawn at h7. Black pawn at a6, black pawn at b6, white knight at d6, black bishop at e6 and black pawn at f6. White queen at a5, white pawn at b5 and white pawn at d5. White pawn at a4, white pawn at d4, black pawn at f4, white pawn at g4 and black pawn at h4. White knight at c3, white pawn at f3 and white rook at h3. White pawn at e2. White rook at a1, white king at e1 and white bishop at f1. White queenside is the only castle move available. Half move number is 0. Full move number is 23. White to move.