1rb1qb1r/1p1pk2p/1Nn1p3/1P3pP1/3pP1Pn/P6P/2PBN3/R1Q1KB1R b Q - 2 23
FEN state: 1rb1qb1r/1p1pk2p/1Nn1p3/1P3pP1/3pP1Pn/P6P/2PBN3/R1Q1KB1R b Q - 2 23 ; Best move: f5e4
The current state of the chess board is: Black rook at b8, black bishop at c8, black queen at e8, black bishop at f8 and black rook at h8. Black pawn at b7, black pawn at d7, black king at e7 and black pawn at h7. White knight at b6, black knight at c6 and black pawn at e6. White pawn at b5, black pawn at f5 and white pawn at g5. Black pawn at d4, white pawn at e4, white pawn at g4 and black knight at h4. White pawn at a3 and white pawn at h3. White pawn at c2, white bishop at d2 and white knight at e2. White rook at a1, white queen at c1, white king at e1, white bishop at f1 and white rook at h1. White queenside is the only castle move available. Half move number is 2. Full move number is 23. Black to move.