r1b2br1/1p1kp1pp/pq1N2P1/2pn1p2/1Q2nP2/BP6/4P1BP/RN2K1R1 w Q - 4 23
FEN state: r1b2br1/1p1kp1pp/pq1N2P1/2pn1p2/1Q2nP2/BP6/4P1BP/RN2K1R1 w Q - 4 23 ; Best move: b4b6
The current state of the chess board is: Black rook at a8, black bishop at c8, black bishop at f8 and black rook at g8. Black pawn at b7, black king at d7, black pawn at e7, black pawn at g7 and black pawn at h7. Black pawn at a6, black queen at b6, white knight at d6 and white pawn at g6. Black pawn at c5, black knight at d5 and black pawn at f5. White queen at b4, black knight at e4 and white pawn at f4. White bishop at a3 and white pawn at b3. White pawn at e2, white bishop at g2 and white pawn at h2. White rook at a1, white knight at b1, white king at e1 and white rook at g1. White queenside is the only castle move available. Half move number is 4. Full move number is 23. White to move.