r1q1k2r/1p4bp/p1ppPn2/2B3p1/P4N2/1P1P1P1N/2PKB2P/5R1R b k - 4 23
FEN state: r1q1k2r/1p4bp/p1ppPn2/2B3p1/P4N2/1P1P1P1N/2PKB2P/5R1R b k - 4 23 ; Best move: g5f4
The current state of the chess board is: Black rook at a8, black queen at c8, black king at e8 and black rook at h8. Black pawn at b7, black bishop at g7 and black pawn at h7. Black pawn at a6, black pawn at c6, black pawn at d6, white pawn at e6 and black knight at f6. White bishop at c5 and black pawn at g5. White pawn at a4 and white knight at f4. White pawn at b3, white pawn at d3, white pawn at f3 and white knight at h3. White pawn at c2, white king at d2, white bishop at e2 and white pawn at h2. White rook at f1 and white rook at h1. Black kingside is the only castle move available. Half move number is 4. Full move number is 23. Black to move.